СПОСОБ ИЗГОТОВЛЕНИЯ ЗАГОТОВКИ, ЗАГОТОВКА, ОПТИЧЕСКОЕ ВОЛОКНО И УСИЛИТЕЛЬ

Изобретение относится к способу изготовления первичной, вторичной или более высокого порядка заготовки, которую можно использовать для вытягивания активного оптического волокна. Техническим результатом изобретения является улучшение однородности показателя преломления волокна. Способ изготовления заготовки, которую можно использовать для изготовления активного оптического волокна, которое содержит, по меньшей мере, одну сердцевину, соответствующую указанной заготовке, содержащий этапы, на которых: подготавливают в начальной технологической стадии кварцевую трубку и смесь SiO2-A/A, включающую частицы SiO2 и частицы А/А (усиления/ослабления); закрепляют кварцевую трубку, которая содержит внутреннее пространство, которое ограничено на нижнем конце кварцевой трубки замыкающим средством, выполненным из пористого материала, такого как пористое стекло; засыпают смесь SiO2-A/A во внутреннее пространство кварцевой трубки; вводят поток газа, такого как кислород O2, гелий He, хлор Cl2 или фтор F через ...

СПОСОБ ИЗГОТОВЛЕНИЯ ДВУЛУЧЕПРЕЛОМЛЯЮЩЕГО МИКРОСТРУКТУРНОГО ОПТИЧЕСКОГО ВОЛОКНА

Способ изготовления двулучепреломляещего микроструктурного оптического волокна, включающий, изготовление исходного стержня-заготовки, получение на всей длине стержня-заготовки четного количества пазов, промывку и сушку стержня-заготовки, сборку стержня-заготовки с кварцевой трубой, сплавление их в преформу и перетягивание преформы в оптическое волокно с нанесением защитного упрочняющего покрытия, отличающийся тем, что на всей длине стержня-заготовки получают не менее 4-х пазов попарно симметричных относительно плоскости, проходящей через продольную ось вращения стержня-заготовки, причем форма и размеры каждой пары симметрично расположенных пазов одинаковы, сплавляют стержнь-заготовку и кварцевую трубу в нерабочей области и перетягивают их в предзаготовку, разрезают предзаготовку на отрезки, растравливают внутренние каналы в отрезке предзаготовки, промывают и сушат внутренние и наружные поверхности отрезка предзаготовки, заваривают отрезок предзаготовки с обоих торцов, собирают отрезок предзаготовки ...

Heat treatment equipment, especially for heating an optical glass fiber preform, comprises a heating chamber with a top inlet, a bottom outlet and one or more side burner openings

Heat treatment equipment, comprising a heating chamber (3-5) with a top inlet, a bottom outlet and one or more side burner openings (10, 11), is new. Preferred Features: The or each burner units (12, 13) is operated with oxygen and hydrogen, natural gas, acetylene, butane, methane or propane.

Processed preform for producing elliptic core optical fiber

Disclosed is a method of producing an elliptic core optical fiber 5, in which a original preform having a circular core 3 disposed at the center of a circular clad 2 is processed to flatten on its periphery to form a processed preform 1 that is then drawn with heating into an elliptic core 7 optical fiber. According to the invention, the form of the processed preform used for producing an elliptic core optical fiber with desired specific dimensions can be designed using pre-obtained correlations based on the dimensions of the elliptic core optical fiber.

Making a large diameter optical waveguide preform

A method for making a preform for a large diameter optical waveguide such as a cane waveguide. includes inserting a preform into a glass tube to serve as cladding that provides a thickened preform, fusing and stretching the thickened preform, placing the streched preform into a second tube to provide a second sleeved preform and fusing and stretching the second sleeved preform to provide an even further thickened preform. The drawing apparatus can be configured to work with the preform disposed either horizontally or vertically and usually includes a graphite resistance furnace. Typically, the drawing apparatus is an upper portion of a draw tower used for drawing an optical fiber from an optical fiber preform. The draw tower includes a tractor pulling mechanism that can adjust to grip a wide range of diameters.

Optical fiber preform

An optical fiber preform comprising; a) a core portion composed of a silica glass; and, b) a cladding portion surrounding the core portion, the cladding portion being composed of a fluorine-containing silica glass having a lower refractive index than the core portion, the core portion including: i) a first region that does not include a central axis of the core portion, the first region containing a first dopant selected from sodium, potassium, and compounds thereof, and ii) a second region that includes the central axis of the core portion, the second region containing a second dopant that reduces the viscosity of the silica glass, the second dopant having a diffusion coefficient of 1 ´ 10−12 cm2/s or more and less than the first dopant at a temperature of 2,000°C to 2,300°C, wherein the entire core portion has an average first dopant concentration of 10 atomic ppm or more and 2,000 atomic ppm or less, and the entire core portion has an average second dopant concentration of 10 atomic ...

Method of fabricating an optical fibre preform

PROCEDURE AND DEVICE FOR THE THERMAL TREATMENT OF MOLDED ARTICLES, FOR EXAMPLE OF A GATHERING MOLD FOR OPTICAL FIBERS

DEVICE AND PROCEDURE FOR THE PRODUCTION OF A GATHERING MOLD FOR AN OPTICAL FIBER

Method and apparatus for the thermal treatment of an object such as an optical fiber preform

Apparatus and process for producing an optical fibre preform

LONG LIFETIME OPTICAL FIBER AND METHOD

A fiber optic construction is described combining low OH (preferably < 1 ppm) materials for use in the core and cladding elements with controlled D0/d ratios to provide extended life expectancy fiber optics for use in high-temperature environments.

METHOD FOR DETERMINING A CONDITION OF AGING FOR OPTICAL FIBER GRATING

The present invention provides a method for determining a condition of aging for an optical fiber grating. This method comprises a step of setting the aged deterioration curve of the optical fiber grating as a form proportional to t-n, where t represents time, and n represents a parameter dependent on temperature; and a step of determining the condition of the aging according to the aged deterioration curve.

OPTICAL FIBER WITH INCREASED DOLGOVEChNO AFTER AND METHOD OF ITS MANUFACTURE

Sintered materials and a process for the production thereof

Optical fibers formed by rolling process

Optical fibers formed by rolling crystals of infrared transmissive material, such as potassium chloride, have been made into a smooth optical fiber by rolling between smooth grooved rolls (16) and (20) in a heated, atmosphere controlled environment. The Government of the United States of America has rights in this invention pursuant to Contract Number N00014-79-0-0691 awarded by the Department of Defense.

ПРЕФОРМА ОПТИЧЕСКОГО ВОЛОКНА С МНОГОСЛОЙНОЙ СТРУКТУРОЙ ОПТИЧЕСКОГО ВОЛОКНА И СПОСОБ ИЗГОТОВЛЕНИЯ ОПТИЧЕСКОГО ВОЛОКНА

Группа изобретений относится к преформе оптического волокна для изготовления оптического волокна с многослойной структурой, способу изготовления оптического волокна с многослойной структурой с использованием преформы оптического волокна. Техническим результатом является улучшение характеристик оптического волокна. Преформа содержит стержень сердцевины, тонкую кварцевую втулку, охватывающую стержень сердцевины, и первую изолирующую кварцевую трубку, образующую втулку между стержнем сердцевины и тонкой кварцевой втулкой. Преформа содержит порошок для изготовления оболочки оптического волокна, загруженный соответственно между стержнем сердцевины и первой изолирующей кварцевой трубкой, а также между первой изолирующей кварцевой трубкой и тонкой кварцевой втулкой. Преформа оптического волокна дополнительно содержит хвостовую трубку, хвостовая трубка содержит хвостовой стержень. Первая хвостовая трубка охватывает хвостовой стержень, вторая хвостовая трубка охватывает первую хвостовую трубку и ...

Verfahren zur Herstellung optischer Fasern und Vorformen ausgehend von einem Glasrohr

PROCEDURE FOR MAKING A GATHERING MOLD OF QUARTZ GLASS FOR OPTICAL FIBERS

OPTICAL FIBER AND YOUR GATHERING MOLD AND PROCEDURE FOR MANUFACTURING THE GATHERING MOLD

MANUFACTURING PROCESS FOR MIKROKANALUND NANO-CHANNEL ARTICLE

Method of manufacturing single-mode optical fiber preform

METHOD FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER

... : The invention provides a method for producing a glass preform, which method comprises forming a soot preform of fine glass particles comprising SiO2 by flame hydrolysis or solution hydrolysis of a starting glass material and sintering the soot preform in an atmosphere containing at least SiF4 to form a glass preform which shows no absorption increases due to the presence of impurities and has a sufficiently low attenuation of light transmission.

METHOD OF AND APPARATUS FOR OVERCLADDING AN OPTICAL PREFORM ROD

... : Methods and apparatus are provided for overcladding a preform rod. The preform rod is aligned with and inserted into an overcladding tube. The outer diameter of the preform rod and the inner diameter of the tube are such that the clearance between the tube and the rod does not exceed a predetermined value. Successive increments of length of the tube and rod therein are subjected to a controlled zone of heat while the pressure inside the tube is maintained at a value which is substantially less than that outside the tube. This causes the tube to be collapsed onto the preform rod to provide an overclad preform and subsequently is substantially concentric with respect to the optical fiber core.

SINTERED MATERIALS

Sintered materials, especially sintered glasses, produced from pyrogenically produced silicon dioxide which has been processed to silicon granulates (sic) in a compacting step, and the use of such granulates in the production of formed glass bodies.

Ultrasonic dispersion apparatus for silica sol

Disclosed are apparatus and method for ultrasonically dispersing a silica sol such as is used in a process of manufacturing a silica glass by a sol-gel method. The apparatus includes a sol feeder for holding a sol to be dispersed, a sol container for containing the ultrasonically dispersed sol, a medium tank having a liquid-phase ultrasonic medium, an ultrasonic vibrator for generating ultrasonic waves within the tank, and a sol pipe for providing a sol feeding path connecting the sol feeder and the sol container to each other, the sol pipe having a portion submerged under the ultrasonic medium in the medium tank. The portion of the sol pipe submerged under the ultrasonic medium has a shape bent in a zigzagged fashion.

Method for manufacturing glass base material, glass base material, and optical fiber

A method for manufacturing a glass base material, which is a base material of an optical fiber, comprising: forming a core of the glass base material; forming the core includes: accumulating glass particles on a starting rod to form a porous glass soot; sintering the porous glass soot in an atmosphere of mixed gas that contains fluorine-compound gas to form a GI type refractive index profile, the refractive index of which gradually decreases with a distance from a center of the core; and forming a clad of the glass base material around the core.

METHOD FOR MAKING AN OPTICAL FIBER DEVICE FROM A 3D PRINTED PREFORM BODY AND RELATED STRUCTURES

A method for making an optical fiber device may include using a three-dimensional (3D) printer to generate a preform body including an optical material. The preform body may have a 3D pattern of voids therein defining a 3D lattice. The method may further include drawing the preform body to form the optical fiber device. 1. A method for making an optical fiber device comprising:using a three-dimensional (3D) printer to generate a preform body comprising an optical material, the preform body having a 3D pattern of voids therein defining a 3D lattice; anddrawing the preform body to form the optical fiber device.2. The method of wherein the preform body comprises a plurality of strands.3. The method of wherein the preform body comprises a plurality of helical strands.4. The method of wherein the preform body comprises a plurality of counter-rotating claim 1 , helical strands.5. The method of wherein the preform body comprises a plurality of intersecting claim 1 , counter-rotating claim 1 , helical strands.6. The method of wherein at least some of the voids open outwardly along a side of the preform body.7. The method of wherein drawing comprises drawing the preform body while retaining the 3D pattern of voids therein.8. The method of further comprising coating at least a portion of the preform body with a different material prior to drawing.9. The method of further comprising electroplating at least a portion of the preform body prior to drawing.10. The method of wherein electroplating comprises electroplating with gold.11. The method of wherein the preform body comprises a plurality of strands; and wherein at least one of the plurality of strands comprises a metal.12. The method of further comprising passing an electrical current through the at least one strand comprising metal during drawing.13. The method of wherein the metal comprises tungsten.14. The method of wherein drawing comprises drawing the preform body in a direction offset with respect to an optical axis ...

РАДИАЛЬНОЕ НАПРЕССОВЫВАНИЕ САЖИ ДЛЯ ПОКРЫТИЯ ОПТИЧЕСКОГО ВОЛОКНА ОБОЛОЧКОЙ

Изобретение относится к способам и устройствам для радиального напрессовывания сажи для покрытия оптического волокна оболочкой и, в частности, к способам и устройству для изготовления заготовок оптического волокна. Технический результат заключается в улучшении плотности и геометрии заготовок. Устройство имеет наружную стенку и внутреннюю стенку. Наружная стенка окружает внутреннюю стенку, и внутренняя стенка окружает внутреннюю полость устройства. Стержень сердцевины размещают во внутренней полости, после чего дисперсный стеклянный материал, такой как стеклянная сажа, осаждают во внутренней полости вокруг стержня сердцевины. Стержень сердцевины имеет по меньшей мере 10 процентов конечной сажевой оболочки, уже нанесенной на него. Направленное радиально внутрь давление прилагают к дисперсному стеклянному материалу для напрессовывания дисперсного стеклянного материала на стержень сердцевины. 12 з.п. ф-лы, 7 ил.

ОБРАБОТКА УЛЬТРАДИСПЕРСНОГО ПОРОШКА НА ОСНОВЕ ДИОКСИДА КРЕМНИЯ ИЛИ ИЗДЕЛИЯ, ИЗГОТОВЛЕННОГО ИЗ УЛЬТРАДИСПЕРСНОГО ПОРОШКА НА ОСНОВЕ ДИОКСИДА КРЕМНИЯ

... 1. Способ очистки ультрадисперсного порошка на основе диоксида кремния или изделия, изготовленного из ультрадисперсного порошка на основе диоксида кремния, причем указанный способ включает обработку указанного ультрадисперсного порошка на основе диоксида кремния или указанного изделия, изготовленного из ультрадисперсного порошка на основе диоксида кремния, по меньшей мере, одним из следующих соединений:(i) смесью CO и Clв газе-носителе, где суммарная концентрация CO и Clв указанной смеси составляет более чем 10 об.% и отношение CO к Clсоставляет от 0,25 до 5;(ii) CClв газе-носителе, где концентрация CClсоставляет более чем 1 об.%.2. Способ очистки ультрадисперсного порошка на основе диоксида кремния или изделия, изготовленного из ультрадисперсного порошка на основе диоксида кремния по п.1, в котором отношение CO к Clсоставляет от 0,5 до 2.3. Способ очистки ультрадисперсного порошка на основе диоксида кремния или изделия, изготовленного из ультрадисперсного порошка на основе диоксида кремния ...

Verfahren zur Bestimmung einer Alterungsbedingung für faseroptisches Gitter

Optische Faser und ihre Vorform und Verfahren zum Herstellen der Vorform

Longitudinally non-uniform preform and method of making the same

A preform 300 for drawing fibres therefrom formed of at least a first material and having anon-uniform structure in the longitudinal direction and a method of forming the same. The preform may comprise at least one of multiple different materials 306, 307, one or more hollow portions 308, varying width or cross section. The hollow portions may be enclosed by the preform or extend to at least one surface; they my further comprise a helical channel. The fibre drawn from the preform may comprise at least one steerable portion by virtue of its materials providing flexibility. One of the materials may comprise a magnetic material. At leas tone of the materials may comprise a stiffness tuneable material, ferromagnetic polymer, polycarbonate, poly (methyl methacrylate) PMMA, polyetherimide, cyclic olefin copolymer (COC), poly(styrene-block-butadiene-block-styrene)(SEBS), cyclic olefin copolymer elastomer (COC-E) and polysulfone. The materials may comprise one of a conducting a material and a polymer ...

METHOD OF AND APPARATUS FOR MANUFACTURING A FUSED TUBE FOR FORMING INTO AN OPTICAL FIBRE WITH PLASMA ACTIVATED DEPOSITION IN A TUBE

GATHERING MOLD WITH HYDROGEN IMPERMEABLE SITUATION WITH AN OPTICAL FIBER FROM OF THIS GATHERING MOLD WAS MANUFACTURED AND MANUFACTURING PROCESSES OF SUCH A GATHERING MOLD

PROCEDURE FOR THE PRODUCTION OF AN OPTICAL FIBER AND A GATHERING MOLD FOR THE PRODUCTION OF AN OPTICAL FIBER

Method of drawing base glass material

STRONG OPTICAL FIBER AND METHOD OF PRODUCING SAME

A glass dielectric fiber waveguide with a composition profile varying radially from the center to the surface, the composition profile causing a surface layer which is in compression, said composition profile being caused by (a) at least one dopant used substantially to create a stress profile wherein the surface is in compression, and (b) at least one dopant used substantially for the purpose of creating an index of refraction profile.

METHOD FOR FABRICATING A PREFORM, A PREFORM, AN OPTICAL FIBER AND AN AMPLIFIER

The present invention relates to a method and an apparatus for fabricatin g a preform (1,10,100) that can be used for drawing an active optical fiber (8). The present invention further relates to an active optical fiber (8), d esigned for amplification or attenuation purposes, drawn from said preform ( 1,10,100) and to an optical amplifier (600, 601) using a laser active optica l fiber.

Optical fiber base material and method for manufacturing optical fiber

Method of manufacturing a preform for use in drawing glass fibers

Förfarande för utdragning av glasämne

Optical fiber with compression surface layer

A glass dielectric fiber waveguide with a composition profile varying radially from the center to the surface, the composition profile causing a surface layer which is in compression, said composition profile being caused by (a) at least one dopant used substantially to create a stress profile wherein the surface is in compression, and (b) at least one dopant used substantially for the purpose of creating an index of refraction profile.

Apparatus and method for improving bandwidth of multimode optical fibers

Embodiments of the invention include an optical communications system including a multimode optical fiber having improved overfill-launch bandwidth performance without disturbing existing laser-launch bandwidth performance. The multimode optical fiber has a characteristic differential mode delay with a first portion associated with lower order modes that behaves conventionally and a second portion associated with higher order modes that deviates from conventional behavior in a way that improves overfill-launch bandwidth performance at one operating window without adversely impacting the laser-launch bandwidth performance at the same and other operating windows. Multimode optical fibers conventionally optimized for operation at 850 nm are configured in such a way that their characteristic differential mode delay, at 1300 nm, initially increases in a conventional manner and then flattens out to approximately zero at the higher order modes. At 850 nm, the characteristic differential mode delay ...

СПОСОБ ИЗГОТОВЛЕНИЯ ДВУЛУЧЕПРЕЛОМЛЯЮЩЕГО МИКРОСТРУКТУРНОГО ОПТИЧЕСКОГО ВОЛОКНА

Изобретение относится к области волоконной оптики и может быть использовано в волоконно-оптических системах передачи информации и при конструировании датчиков физических величин. Согласно способу на всей длине стержня-заготовки получают не менее 4-х пазов, попарно симметричных относительно плоскости, проходящей через продольную ось вращения стержня-заготовки. В поперечном сечении получают структуру сердцевины волокна, размеры которой определяются размерами вписанного эллипса. Сплавляют стержень-заготовку и кварцевую трубу в нерабочей области и перетягивают их в предзаготовку. Предзаготовку разрезают на отрезки, в которых растравливают внутренние каналы, промывают и сушат внутренние и наружные поверхности, а затем заваривают с обоих торцов. Отрезок предзаготовки собирают с капиллярной кварцевой трубкой, содержащей приваренный трубчатый технологический держатель. Сплавляют отрезок предзаготовки и капиллярную кварцевую трубку на стороне, противоположной трубчатому технологическому держателю ...

СПОСОБ ИЗГОТОВЛЕНИЯ ЗАГОТОВКИ, ЗАГОТОВКА, ОПТИЧЕСКОЕ ВОЛОКНО И УСИЛИТЕЛЬ

... 1. Способ изготовления заготовки (1), которую можно использовать для изготовления активного оптического волокна (8), которое содержит, по меньшей мере, одну сердцевину, соответствующую указанной заготовке (1), содержащий этапы, на которых: ! подготавливают в начальной технологической стадии кварцевую трубку (11) и смесь SiO2-А/А, включающую частицы SiO2 (51) и частицы А/А (усиления/ослабления) (52), ! закрепляют кварцевую трубку (11), которая содержит внутреннее пространство (12), которое ограничено в нижнем конце кварцевой трубки (11) замыкающим средством (13); ! засыпают смесь SiO2-A/A (51, 52, 58) во внутреннее пространство (12) кварцевой трубки (11); ! предпочтительно, присоединяют соединительное устройство (3) к верхнему концу первичной кварцевой трубки (11) и создают пониженное давление внутри внутреннего пространства (12); и ! нагревают, по меньшей мере, нижнюю часть необработанной заготовки (1), чтобы сплавить кварцевую трубку (11) и смесь SiO2-А/А (51, 52, 58). ! 2. Способ изготовления ...

ПРЕФОРМА ОПТИЧЕСКОГО ВОЛОКНА ДЛЯ ИЗГОТОВЛЕНИЯ ОДНОМОДОВОГО ОПТИЧЕСКОГО ВОЛОКНА И СПОСОБ ИЗГОТОВЛЕНИЯ ОДНОМОДОВОГО ОПТИЧЕСКОГО ВОЛОКНА

Группа изобретений относится к преформе оптического волокна для изготовления одномодового оптического волокна, способу изготовления одномодового оптического волокна с использованием преформы оптического волокна. Техническим результатом является повышение характеристик оптического волокна. Преформа оптического волокна для изготовления одномодового оптического волокна содержит стержень сердцевины, тонкую кварцевую втулку, охватывающую стержень сердцевины, и изолирующую кварцевую трубку, образующую втулку между стержнем сердцевины и тонкой кварцевой втулкой, зазор между изолирующей кварцевой трубкой и тонкой кварцевой втулкой образует заполняемое кварцевым порошком пространство. Преформа оптического волокна дополнительно содержит хвостовую трубку. Хвостовая трубка содержит хвостовой стержень, малую хвостовую трубку, охватывающую хвостовой стержень, большую хвостовую трубку, охватывающую малую хвостовую трубку, и уплотнительную заглушку, расположенную на конце хвостового стержня, малой хвостовой ...

Method of producing an elliptic core optical fiber,and a processed preform used for producing elliptic core optical fiber

Conditioning Optical Fibers For Improved Ionizing Radiation Response

METHODS FOR THE MANUFACTURING OF PREFORMS FOR THE DRAWING OF GLASS FIBRES

... 1440178 Preforms for core/cladding glass fibres SIEMENS AG 26 Feb 1975 [28 Feb 1974] 7957/75 Heading C1M In the manufacture of a preform for drawing into a glass fibre having a core and a cladding and composed of a plurality of preform elements fitted into optical contact with one another, at least one groove 2 is provided in at least one preform element 1 of cladding glass, the groove 2 is filled with core glass 6 and the element 1 and core glass 6 polished to obtain a flat surface 7 to which is fitted a further preform 9 of cladding glass with optical contact. The core glass 6 is preferably powder melted by a focused CO 2 laser beam 5 and a thin layer 3 of core glass may first be deposited in the groove 2 by vapour deposition. A further layer 8 of cladding glass may be deposited by vapour deposition on the flat surface 7 and the element 9 has a polished surface 10. The whole of the groove may be filled by vapour deposition. Multiple core fibres may be produced and as shown (Fig. 9) parallel ...

ROD-SHAPED GATHERING MOLD FOR OPTICAL FIBERS AND PROCEDURE FOR THE PRODUCTION OF THE GATHERING MOLD AS WELL AS THE FIBER

OPTICAL FIBER PREFORM, OPTICAL FIBER AND THEIR MANUFACTURING METHODS

An optical fiber preform of the present invention comprises a core made of a transparent material in a central region and a cladding made of a transparent material in a peripheral region, and the optical fiber preform is uniformly twisted in the core in one direction or around a central axis passing through in the vicinity of said core in one direction, and has a length longer than a twisted pitch, so that an optical fiber which is drawn from the preform has uniform twists remained in one direction, and polarization dispersion which occurs in an optical signal propagating in the optical fiber appears around an optical axis in 360.degree. direction and is cancelled out one after another; therefore, the entire polarization dispersion can be suppressed. Further, the optical fiber may be twisted in a step of vitrifying or pulling during optical fiber manufacture, which does not cause a rise in the processing cost.

PROCESS FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER

A process for producing a porous glass preform for optical fiber by depositing fine glass particles on an outer surface of a glass material while moving the glass material, including the steps of: preheating a portion of the glass material to clean the portion of the glass material in an apparatus for depositing fine glass particles; and depositing fine glass particles on the portion of the glass material cleaned by the preheating, in the apparatus for depositing fine glass particles.

Method for manufacturing an optical fiber preform

3D 프린팅된 예비 형성체 및 관련 구조들로 광 섬유 디바이스를 제조하기 위한 방법

... 광 섬유 디바이스를 제조하기 위한 방법은 3-차원(3D) 프린터를 사용하여 광학 재료를 포함하는 예비 형성체를 만드는 단계를 포함할 수 있다. 예비 형성체는 그 안에 3D 격자를 획정하는 공극들의 3D 패턴을 가질 수 있다. 상기 방법은 광 섬유 디바이스를 형성하기 위해 예비 형성체를 드로잉(drawing)하는 단계를 더 포함할 수 있다.

método para fabricar uma fibra óptica

Glass base material, method for fabricating the same and method for fabricating optical fiber

A glass base material, method for fabricating the same and method for fabricating optical fiber, are provided. When a taper is formed at one end of the glass base material used for fabricating optical fiber, a central variation, which is at the melt-down location of the central line of the glass base material, will first be corrected for lower than a specific value. Then, the corrected location is melt down and the taper is formed. Besides, the glass base material used for pulling thread has a straight trunk effective part with an average diameter D, and a taper at one end of the straight trunk effective part. When the glass base material is installed into a pulling thread apparatus, the ratio /D of the distortion of the taper to the average diameter D is lower than 0.03. (i.e. /D 0.03) Wherein, the inclination of the taper is the maximum value of the central variation of the glass base material, which is between the straight trunk effective end and a inclination evaluation end of the taper ...

MULTICORE FIBER, METHOD FOR MANUFACTURING MULTICORE FIBER, MULTICORE FIBER BASE MATERIAL, AND METHOD FOR MANUFACTURING MULTICORE FIBER BASE MATERIAL

It is an object to provide a multicore fiber having high rupture strength, a manufacturing method for the multicore fiber, a multicore fiber preform, and a manufacturing method for the multicore fiber preform. The multicore fiber includes a plurality of core portions, and a cladding portion that is made of glass and that surrounds the outer peripheries of the core portions. In the region present on the outer periphery side than the closest core portion, from among the core portions, to the outer periphery of the cladding portion, the tensile stress of the cladding portion is equal to or lower than 20 MPa. The concerned region can include at least a single element from among halogen, alkali metal, and boron.

УСТРОЙСТВО И СПОСОБ ДЛЯ НАТЯЖЕНИЯ И УКЛАДКИ ОПТОВОЛОКНА

Настоящее изобретение относится к устройству и способу для натяжения и укладки оптического волокна. Устройство для натяжения и укладки оптического волокна содержит первый, второй и третий ролики, ремень, который проходит вокруг первого и второго роликов и находится в прямом физическом контакте с первым и вторым роликами. По меньшей мере один из первого, второго и третьего роликов приводится в движение таким образом, что оптическое волокно захватывается между ремнем и третьим роликом. Первый ролик, второй ролик, третий ролик и ремень имеют такие размеры и расположение, что оптическое волокно перемещается через устройство для натяжения и укладки оптического волокна со скоростью по меньшей мере 30 м/с; и отделение, которое вмещает в себя первый, второй и третий ролики, а также ремень. Причем это отделение поддерживается под отрицательным давлением. Способ работы устройства для натяжения и укладки оптического волокна, содержащий этапы: получения оптического волокна через входное сопло; захвата ...

УЗЕЛ ЗАГРУЗКИ ПЛАВИЛЬНОГО ТИГЛЯ УСТРОЙСТВА ДЛЯ ПОЛУЧЕНИЯ ИЗДЕЛИЙ ИЗ КВАРЦЕВОГО ПЕСКА

... 1. Узел загрузки плавильного тигля устройства для получения изделий из кварцевого стекла, включающий питающий бункер-дозатор с устройством для удаления воздуха из межзернового пространства подаваемого исходного сырья минеральной крупки, отличающийся тем, что питающий бункер-дозатор снабжен верхним вакуумным затвором и дополнительно соединен со вторым бункером-дозатором через нижний вакуумным затвор, при этом упомянутый нижний вакуумный затвор между бункерами-дозаторами выполнен с возможностью периодического открытия и закрытия при включении устройства для удаления воздуха из межзернового пространства подаваемого исходного сырья минеральной крупки, подключенного к верхнему питающему бункеру-дозатору, а второй бункер-дозатор соединен с плавильным тиглем посредством трубопровода, через который самотеком поступает исходный материал минеральная крупка в упомянутый плавильный тигель.2. Узел загрузки плавильного тигля по п. 1, отличающийся тем, что питающий бункер-дозатор снабжен устройством для ...

РАДИАЛЬНОЕ НАПРЕССОВЫВАНИЕ САЖИ ДЛЯ ПОКРЫТИЯ ОПТИЧЕСКОГО ВОЛОКНА ОБОЛОЧКОЙ

... 1. Способ изготовления заготовки оптического волокна для изготовления оптического волокна, содержащий этапы, на которых:помещают частично изготовленную заготовку во внутреннюю полость устройства, причем частично изготовленная заготовка содержит материал внутренней сердцевины, который окружен пористым сажевым участком, причем упомянутый пористый сажевый участок содержит сажу оболочки, которая будет составлять по меньшей мере 10 процентов толщины стеклянной оболочки в готовом оптическом волокне;осаждают дисперсный стеклянный материал во внутренней полости между частично изготовленной заготовкой и внутренней стенкой; иприлагают направленное радиально внутрь давление к дисперсному стеклянному материалу для напрессовывания дисперсного стеклянного материала на пористый слой сажи на упомянутой частично изготовленной заготовке.2. Способ по п.1, в котором пористый сажевый участок имеет толщину, которая будет составлять менее 70 процентов толщины стекла в конечной заготовке оптического волокна.3.

VERFAHREN ZUR HERSTELLUNG EINES AUSGANGSKOERPERS ZUM ZIEHEN VON GLASFASERN

Method of fusing and stretching a large diameter optical waveguide

Method of fusing and stretching a large diameter optical waveguide

Conditioning Optical Fibers For Improved Ionizing Radiation Response

MANUFACTURING MICROSCOPIC COMPONENTS

Method of manufacturing single-mode optical fiber preform

Optical fiber preform, optical fiber and their manufacturing methods

METHOD OF AND APPARATUS FOR MANUFACTURING AN OPTICAL FIBRE WITH PLASMA ACTIVATED DEPOSITION IN A TUBE

An optical fibre is manufactured by forming a layer of fused silica, which may or may not be doped, on the inner wall of a fused silica tube by producing A plasma in the reactant gases flowing through the tube. By this means a higher temperature can be maintained inside the tube than at the tubes outer wall. The plasma is produced at substantially atmospheric pressure. Cooling gas is passed along the outer wall of the tube. - i ...

dispositivo e método para a fabricação de uma pré-forma.

fibra ótica e sua preforma além de método e aparelho para a fabricação das mesmas

Optical fiber preform producing method, optical fiber production method, and optical fiber

To provide a manufacturing method for an optical fiber preform and a manufacturing method for an optical fiber in which the optical fiber with a complex profile is produced at high precision, and an optical fiber. The invention provides the method for manufacturing the optical fiber preform comprising a central core portion having a maximal value Nc of refractive index in the center, and outside the central core portion, comprising at least a depressed portion having a minimal value Nd of refractive index, a ring portion having a maximal value Nr of refractive index and an outside cladding layer having a maximal value No of refractive index, the optical fiber preform satisfying a relation of Nc>=Nr>=No>=Nd among the values of refractive index. This method is characterized by comprising a glass rod fabrication step of fabricating a glass rod by inserting a rod containing at least the central core portion into a pipe containing at least the depressed portion and integrating them by collapse ...

Apparatus for manufacturing photonic crystal fiber preform

An apparatus for manufacturing a photonic crystal fiber preform having a plurality of holes that extend in a lengthwise direction of the photonic crystal fiber perform is disclosed. The apparatus includes a housing for receiving a raw material for the photonic crystal fiber perform, a first support section arranged at an upper part of the housing; a second support section arranged at a lower part of the housing, and a plurality of pins supported by the first and second support sections. At least a portion of each pin is positioned in the housing. The apparatus also includes a vacuum pump for vacuumizing the interior of the housing; a first pipe connected to the lower part of the housing to introduce the raw material into the housing; and a first valve installed on the first pipe to open and close the first pipe.

Process for preparing optical fiber cladding solutions

A process for preparing optical fiber cladding solutions starting with a monomer having the formula CH2 =C(R)COOCHXY where R is H or methyl; X is H or CF3,3, Y is H or CF3 provided that when X is H, Y is --CF3, --CF(CF3)OCF2 CF(CF3)OC4 F9 or --(CF2)n Z, Z is F or H; and n is 1 to 8. The monomers are subjected to UV light at about 1-400 nm for one to four hours until a cladding solution of desired viscosity is obtained.

Method for fabricating an optical fiber, preform for fabricating an optical fiber, optical fiber and apparatus

The method for fabricating an optical fiber comprises the steps of inserting a primary optical fiber preform (11) having a first primary axis (x1) and an outer surface (111) into an overcladding tube (12) having a second primary axis (x2) and an inner surface (120), so that said outer surface and inner surface define an interior space (15); holding the primary preform (11) in a centrally inserted position within the overcladding tube (12) with said first and second primary axes (x1, x2) in substantial alignment with each other; supplying overcladding grain (13) into the interior space (15) that is limited at the lower end of the overcladding tube (12) by means of a closure (125); generating a condition of reduced pressure within the interior space (15) that is limited at the upper end of the overcladding tube (12) by means of an adjoiner (3), which holds the primary optical fiber preform (11) and the overcladding tube (12) in position; and heating the unprocessed secondary preform (1), ...

Method of manufacturing optical fiber base material

A method of manufacturing an optical fiber base material having very little impurity which deteriorates the transmission characteristic of an optical fiber is provided. The method of manufacturing an optical fiber base material including: producing a core member for the optical fiber base material by dehydrating and transparently vitrifying a base material formed by depositing glass particles; and drawing the core member and then adding a cladding thereto at a desired core to cladding ratio, wherein the dehydrating includes suspending the base material in a furnace tube having a heating region in a first atmosphere at a first temperature, the base material passing through the heating region as upwardly moving, and the transparently vitrifying includes situating the base material below once and then allowing the base material to pass through the heating region in a second atmosphere at a second temperature as upwardly moving again.

Multimode optical fiber with large bandwidth and preform

Embodiments of the invention include an optical fiber preform (30) and a multimode optical fiber drawn therefrom that has improved overfill-launch bandwidth performance without disturbing existing laser-launch bandwidth performance. The optical fiber preform includes a core region (34) configured to have a refractive index with a characteristic differential mode delay with a first portion associated with lower order modes that behaves conventionally and a second portion associated with higher order modes that deviates from conventional behavior in a way that improves overfill-launch bandwidth performance at one operating window without adversely impacting the laser-launch bandwidth performance at the same and other operating windows. Preform configurations conventionally optimized for operation at 850 nm are configured in such a way that their characteristic differential mode delay, at 1300 nm, initially increases in a conventional manner and then flattens out to approximately zero at the ...

METHOD OF MANUFACTURING POROUS PREFORM FOR OPTICAL FIBER AND GLASS PREFORM

PROBLEM TO BE SOLVED: To provide a method of manufacturing a porous glass preform by which the deposition rate of a glass fine particle on a deposition surface is increased, soot suspended in a reaction vessel is reduced and the occurrence of bubbles produced in a product is prevented and the glass preform. SOLUTION: In the method of manufacturing the porous glass preform by flame-hydrolyzing a glass raw material in oxyhydrogen flame and depositing the produced glass fine particle, the glass fine particle is deposited by moving a center rod upward at almost fixed speed with the deposition of the glass fine particle and jetting flame stream containing the synthesized glass fine particle toward the glass fine particle deposition surface from the diagonally downward direction to form a recessed part on the deposition bottom surface of a deposited body. COPYRIGHT: (C)2005,JPO&NCIPI ...

Способ изготовления фоторефрактивых световодов

Изобретение относится к волоконной оптике, в частности к технологии изготовления кварцевых волоконных световодов с сердцевиной из фоторефрактивного стекла для изготовления волоконных брегговских решеток (ВБР). В способе изготовления фоторефрактивных световодов MCVD для повышения фоточувствительности сердцевину легируют не менее 13 и не более 20 мол. % диоксидом германия и 1-2,2 масс. % фтора, а вытягивание волокна производят при температуре нагрева заготовки 2000-2050°С. Технический результат – повышение фоторефрактивных свойств фторгерманосиликатных волоконных световодов. 3 табл., 3 пр.

СПОСОБ ИЗГОТОВЛЕНИЯ ОПТИЧЕСКОГО ВОЛОКНА

Изобретение относится к способу изготовления оптического волокна. Техническим результатом изобретения является исключение изменения диаметра покрытия из смолы на волокне. Способ изготовления оптического волокна включает расплавление и деформирование заготовки оптического волокна; вытягивание расплавленного и деформированного участка из заготовки оптического волокна в качестве непокрытого оптического волокна; принудительное охлаждение непокрытого оптического волокна в охлаждающем устройстве; формирование слоя защитного покрытия на охлажденном непокрытом оптическом волокне в устройстве для нанесения покрытия и отверждение слоя защитного покрытия. При этом способ дополнительно содержит этапы, на которых: соединяют охлаждающее устройство и устройство для нанесения покрытия воздухонепроницаемым образом и, предотвращая втекание охлаждающего газа, втекающего внутрь охлаждающего устройства, в устройство для нанесения покрытия с помощью мениска смолы внутри устройства для нанесения покрытия, выпускают ...

Method of drawing base glass material

Method of fabricating an optical fibre preform

Method of fabricating an optical fibre preform may comprise using a subtractive process, such as laser assisted etching, on an optical monolith to define at least a transverse section of the preform. The transverse section may comprise at least two regions with different refractive indexes. Laser assisted etching may comprise laser writing a structure in the monolith and chemically etching the structure. The method may comprise defining at least two transverse sections followed by stacking them to form a stacked preform. The stacked sections may be coupled by passive alignment or by at least one interconnecting feature in at least one of the two sections. A method of assembling optical components may comprise using a subtractive process to define first and second interconnecting features for use with or in first and second optical components, followed by coupling the optical components using the interconnecting features.

Optical fiber preform

Method for determining a condition of aging for optical fiber grating

PROVIDING OVERCLADDING TO OPTICAL FIBRE PREFORM

Method of manufacturing optical fiber base material

MIRROR-LIKE FINISHING METHOD FOR OPTICAL MATERIAL

According to an embodiment of the present invention, disclosed is a mirror-like finishing method for an optical material which can perform mirror-like finishing without damaging an optical material. The method comprises: a heat treatment step of applying heat to an optical material; and a mirror-like finishing step of performing mirror-like finishing on the optical material surface on which the heat treatment step is performed, wherein the mirror-like finishing step is a step of melting at least a part of the surface of the optical material on which the heat treatment step is performed to perform mirror-like finishing on the optical material. COPYRIGHT KIPO 2018 (10,100) Optical material (A1,A2) Surface (BB) Heat treatment ...

LONG LIFETIME OPTICAL FIBER AND METHOD

A fiber optic construction is described combining low OH (preferably < 1 ppm) materials for use in the core and cladding elements with controlled D0/d ratios to provide extended life expectancy fiber optics for use in high-temperature environments.

Method for manufacturing base material for optical fiber, apparatus therefor, and base material manufactured by the same

A method for manufacturing a base material for an optical fiber, includes steps of: holding a bar material by a support member; and adjusting to reduce a difference between an axis of the bar material and a rotational axis of the support member. Furthermore, an optical fiber base material grasping apparatus for holding a bar material having an axis, includes: a support member having a center axis, the support member being rotatable around the center axis; and an adjusting mechanism for reducing a difference between the axis of the bar material and the central axis of the support member.

Optical fiber preform

An optical fiber preform includes a silica-glass core portion, and a cladding portion surrounding the core portion, the cladding portion being composed of a fluorine-containing silica glass having a lower refractive index than the core portion, the core portion including a first region that does not include the central axis thereof, the first region containing a first dopant selected from sodium, potassium, and compounds thereof, and a second region that includes the central axis, the second region containing a second dopant that reduces the viscosity of the silica glass, the second dopant having a diffusion coefficient of 1×10−12 cm2/s or more and less than the first dopant at 2,000° C. to 2,300° C., in which the entire core portion has an average first dopant concentration of 10 atomic ppm or more and 2,000 atomic ppm or less and an average second dopant concentration of 10 atomic ppm or more.

Process for producing glass preform for optical fiber

CONDITIONING OPTICAL FIBERS FOR IMPROVED IONIZING RADIATION RESPONSE

Embodiments of the present invention provide various methods to fabricate optical fibers with reduced radiation sensitivity. Optical fibers are treated to one or more secondary or post-processing "conditioning" steps to create and anneal residual defects in the glass for improved radiation insensitivity.

STRONG OPTICAL FIBER AND METHOD OF PRODUCING SAME

Active optical fiber doped with semiconductor beta-Ga2O3 nanocrystals and preparation method thereof

Heat-insulating device for optical fiber preform

Repairing method for optical fiber preform

PROCEDE ET DISPOSITIF POUR LA FABRICATION D'UNE FIBRE OPTIQUE A DEPOT DANS UN TUBE ACTIVE PAR PLASMA

Procédé et dispositif de fabrication d'une fibre optique permettant d'obtenir une température élevée et d'utiliser une pression voisine de la pression atmosphérique. Une fibre optique est fabriquée en formant une couche de silice fondue, qui peut être ou non dopée, sur la paroi intérieure d'un tube 10 en silice fondue, en produisant un plasma 16 dans les gaz de réaction 14 circulant dans le tube. Une température élevée peut ainsi être maintenue à l'intérieur du tube, température supérieure à celle de la paroi extérieure du tube. Le plasma est produit à une pression sensiblement voisine de la pression atmosphérique. Un gaz de refroidissement 15 passe le long de la paroi extérieure du tube. Application à la fabrication de fibres optiques.

Method of manufacturing a preform for use in drawing glass fibers

PREFORM INCLUDING/UNDERSTANDING a COATING BARRIER AGAINST the HYDROGEN DIFFUSION IN FIBEROPTIC MANUFACTURED FROM THIS PREFORM AND METHOD OF PREPARATION Of SUCH a PREFORM

Préforme (3) de fibre optique comprenant un coeur (20), de rayon R, et une gaine comprenant une gaine optique (21) et une gaine externe (28), caractérisée en ce que la gaine externe (28) comprend une zone interne (27), et une zone périphérique (25), cette dernière en silice dopée par l'alumine, d'épaisseur comprise entre 0, 08 R et 2, 2 R et de proportion poids d'alumine telle que la concentration équivalente d'alumine dans toute la gaine externe (28) est comprise entre 100 et 1000 ppm en poids d'aluminium par rapport à la silice. Procédé de fabrication de ladite préforme et fibre optique associée (15).

Elongating method and apparatus for glass base material

A method of elongating a glass base material to obtain a glass rod having a smaller diameter, using a glass base material elongating apparatus including a feeder at least for the glass base material, a heating furnace, and an elongating mechanism of the glass base material below the heating furnace, is such that a horizontal plane position measuring unit of the glass base material is provided inside or near the heating furnace, the feeder has a glass base material horizontal plane position adjusting unit, and the elongating mechanism has three or more sets of elongating rollers capable of switching between grasping and releasing for keeping the position of the glass rod in the horizontal plane to be constant, and the glass base material is elongated with the position thereof in the horizontal plane kept as targeted by controlling the glass base material horizontal plane position adjusting unit.

Apparatus and method for making an optical fiber preform

Apparatus and methods for making an optical fiber preform at low cost avoiding the apparatus from being damaged are provided. Apparatus for making an optical fiber preform by depositing glass particles on the circumferential surface of a glass rod comprises: a chamber, a plasma torch, a glass particle supplying part, a composition modification gas supplying part, and an exhaust part. The chamber surrounds the heating portion of the glass rod heated by the plasma torch. The plasma torch heats the glass particles by a plasma flame. The glass particle supplying part introduces glass particles towards the heating portion of the glass rod in the chamber. The composition modification gas supplying part introduces composition modification gas into the chamber in order to modify the composition of the glass particles to be deposited on the heating portion of the glass rod in the chamber.

Device and method for manufacturing an optical preform

A device for contracting a hollow substrate tube made of quartz glass into an optical perform including a heat source movable relative to the longitudinal direction of the substrate tube and an insert tube positioned in the interior of the substrate tube, at one end thereof, provided with a central opening through which a gas is passed and supplied to the interior of the substrate tube.

Coupled multicore fiber

A coupled multi-core fiber 10 includes a plurality of cores 11 and a clad 12 surrounding the plurality of cores 11, wherein the plurality of cores 11 are arranged in such a way that periphery surfaces of the adjacent cores 11 contact with each other, each of the cores 11 is made to have a refractive index higher than the clad 12 and includes: an outer region 16 having a predetermined thickness from the periphery surface; and an inner region 15 made to have a higher refractive index than the outer region 16 and surrounded by the outer region 16.

Method for producing synthetic quartz glass

A known method for producing synthetic quartz glass comprises the method steps of: forming a stream of a SiO 2 feedstock material which contains octamethylcyclotetrasiloxane (D4) as the main component which has a reference molecular mass assigned to it, feeding the stream to a reaction zone in which the feedstock material is converted under formation of amorphous SiO 2 particles by pyrolysis or hydrolysis into SiO 2 , depositing the amorphous SiO 2 particles on a deposition surface while forming a porous SiO 2 soot body, and vitrifying the SiO 2 soot body while forming the synthetic quartz glass. Starting therefrom, to enable the production of large-volume cylindrical soot bodies with outer diameters of more than 300 mm of improved material homogeneity, it is suggested according to the invention that the feedstock material contains additional components in the form of further polyalkylsiloxanes, wherein light polyalkylsiloxanes with a relative molecular mass of less than the reference molecular mass are contained with a weight fraction of at least 50 ppm, and heavy polyalkylsiloxanes with a relative molecular mass of more than the reference molecular mass are contained with a weight fraction of at least 30 ppm.

Porous glass base material thermal insulating member and sintering method

In order to prevent thermal deformation of a thermal insulating board and scattering of radiant heat when sintering porous glass base material, provided is a thermal insulating member is arranged on a dummy rod above a porous glass base material, which is formed by depositing glass fine particles on the outside of a starting member formed by connecting the dummy rod to at least one end of a core rod, when heating the porous glass base material to achieve sintering. The thermal insulating member comprises a cylindrical insulating cylinder; an insulating upper board connected to a top end of the insulating cylinder; an insulating lower board connected to a bottom end of the insulating cylinder; and a thermal deformation preventing member that prevents thermal deformation of at least one of the insulating cylinder, the insulating upper board, and the insulating lower board.

GLASS BASE MATERIAL ELONGATING METHOD

A glass base material elongating method of elongating a glass base material to make a diameter of the glass base material smaller by connecting a pulling dummy at an end of the glass base material and then gripping and pulling the pulling dummy with a pair of rollers that grip or release the pulling dummy is provided. The method includes forming a rough surface part on the pulling dummy before elongating the glass base material. 1. A glass base material elongating method of elongating a glass base material to make a diameter of the glass base material smaller by connecting a pulling dummy at an end of the glass base material and then gripping and pulling the pulling dummy with a pair of rollers that grip or release the pulling dummy , the method comprising:forming a rough surface part on the pulling dummy before elongating the glass base material.2. The glass base material elongating method according to claim 1 , wherein forming the rough surface part on the pulling dummy comprises grinding the pulling dummy.3. The glass base material elongating method according to claim 1 , wherein the rough surface part of the pulling dummy has a roughness of 5 μm or more.4. The glass base material elongating method according to claim 3 , wherein the rough surface part of the pulling dummy has a roughness of 10 μm or more.5. The glass base material elongating method according to claim 4 , wherein the rough surface part of the pulling dummy has a roughness of 30 μm or more.6. The glass base material elongating method according to claim 1 , wherein forming the rough surface part on the pulling dummy comprises forming a plurality of steps elongating across a longitudinal direction of the pulling dummy claim 1 , and arranging the plurality of steps in the longitudinal direction.7. The glass base material elongating method according to claim 6 , wherein forming the rough surface part on the pulling dummy comprises making the surface of the pulling dummy comb-shape.8. The glass base ...

POROUS GLASS BASE MATERIAL SINTERING METHOD

It is an objective of the present invention to provide a method for sintering a porous glass base material that can experience an earthquake or large vibration without the base material falling or decreasing in quality when performing sintering, dehydration, and transparent vitrification on the porous glass base material. Provided is a method of sintering a porous glass base material including sintering by lowering the porous glass base material vertically through a furnace from above while rotating the porous glass base material, the method comprising changing rotational speed of the porous glass base material during the sintering. 1. A method of sintering a porous glass base material including sintering by lowering the porous glass base material vertically through a furnace from above while rotating the porous glass base material , the method comprising:changing rotational speed of the porous glass base material during the sintering.2. The method of sintering a porous glass base material according to claim 1 , whereinthe rotational speed is increased at least as the sintering of the porous glass base material progresses.3. The method of sintering a porous glass base material according to claim 2 , wherein{'sub': 1', '2', '1', '2, 'with rrepresenting the rotational speed at a start of sintering and rrepresenting the rotational speed at an end of the sintering, the rotational speed is increased according to a lowered position of the porous glass base material such that ris less than r.'}4. The method of sintering a porous glass base material according to claim 3 , wherein{'sub': 1', '2, 'the rotational speed ris less than or equal to 5 rpm, and the rotational speed ris greater than or equal to 7 rpm.'}5. The method of sintering a porous glass base material according to claim 2 , wherein{'sub': 3', '4', '5', '3', '4', '5', '4, 'with rrepresenting the rotational speed at a start of the sintering, rrepresenting the rotational speed during sinter, and rrepresenting the ...

Methods for Making Active Laser Fibers

Methods for making active laser fibers include the production of an optical fiber with disturbed (or deviated) cylindrical symmetry on the glass surface of the fiber. The methods include a preform containing a central core made of glass. In one embodiment, the preform is circular and surrounded by additional glass rods and an outer glass jacket tube. In a first alternative embodiment, this preform is merged during fiber drawing. In a second alternative embodiment, the preform merged in a process forming a compact glass body with disturbed cylindrical symmetry. This compact preform is drawn into a fiber under conditions maintaining the disturbed cylindrical symmetry. 1. A method for making an optical fiber having an irregular cylindrical shape , comprising:arranging a first glass rod to be central to a plurality of second glass rods;enclosing the first and second glass rods within an outer jacket tube to make a preform;merging the preform by drawing the preform into a fiber.2. The method of wherein the cross-sectional shape of each of the plurality of second glass rods is selected from the group consisting of polygonal claim 1 , circular claim 1 , circular arc claim 1 , and circular segmented.3. The method of wherein the irregularity in the cylindrical shape of the optical fiber depends on the number of second glass rods in the plurality claim 1 , and the degree of irregularity depends on the diameters of the second glass rods in the plurality.4. The method of wherein the plurality of second glass rods includes rods of differing diameters.5. The method of wherein the first glass rod includes a core doped with at least one rare earth element such that the resulting optical fiber is capable of generating laser light.6. The method of wherein at least one of the rods in the plurality of second glass rods is doped with boron claim 1 , wherein the doped second rod is a stress element generating mechanical stress and birefringence in the optical fiber.7. The method of ...

OPTICAL FIBER ARTICLE FOR HANDLING HIGHER POWER AND METHOD OF FABRICATING OR USING

An optical fiber preform, and method for fabricating, having a first core, a second core spaced from the first core and first and second regions, the first region having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing the first straight length. One of the regions can comprise the first core and the other comprises the second core. The preform can be drawn with rotation to provide a fiber wherein a first core of the fiber is multimode at a selected wavelength of operation and a second core of the fiber is spaced from and winds around the first core and has a selected longitudinal pitch. The second core of the fiber can couple to a higher order mode of the first core and increase the attenuation thereof relative to the fundamental mode of the first core. 1. A method for making an optical fiber having a first core and a second core spaced from the first core , the method comprising: a first core;', 'a second core spaced from the first core; and', 'first and second regions, said first region when viewed in cross section having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing said first substantially straight length, the first straight length and the second straight length being contiguous and substantially parallel;', 'one of said first and second regions comprising said first core and a cladding disposed about said first core and the other of said first and second regions comprising said second core and a cladding disposed about said second core;', 'said preform being constructed and arranged such that the preform can be drawn with rotation about an axis passing through the first core to provide the fiber wherein the first core of the fiber is multimode at a selected wavelength of operation and the second core of the fiber is spaced from ...

METHOD OF MANUFACTURING AN OPTICAL FIBRE GLASS PREFORM

A method of manufacturing an optical fibre preform includes: producing a core rod having a core rod diameter; inserting the core rod into a glass fluorine-doped intermediate cladding tube so as to form a core assembly, the intermediate cladding tube having an inner diameter and an outer diameter, wherein the inner diameter is larger than the core rod diameter, the radial difference between the inner diameter and the core rod diameter defining an annular gap; and applying a negative pressure inside the annular gap; and forming a core preform by heating the core assembly to collapse the intermediate cladding tube around the core rod while maintaining the negative pressure, wherein heating includes moving a heater outside the intermediate cladding tube and along an axial direction of the same, and forming an overcladding region surrounding the core preform so as to form an optical fibre preform. 115-. (canceled)20. A method of manufacturing an optical fibre preform comprising:producing a core rod having a core rod diameter;inserting the core rod into a glass fluorine-doped intermediate cladding tube so as to form a core assembly, the intermediate cladding tube having an inner diameter and an outer diameter, wherein the inner diameter is larger than the core rod diameter, the radial difference between the inner diameter and the core rod diameter defining an annular gap;applying a negative pressure inside the annular gap;forming a core preform by heating the core assembly to collapse the intermediate cladding tube around the core rod while maintaining the negative pressure, wherein heating comprises moving a heater outside the intermediate cladding tube and along an axial direction of the intermediate cladding tube; andforming an overcladding region surrounding the core preform so as to form an optical fibre preform.21. The method of claim 20 , wherein the annular gap has a gap width of 1 to 5 mm.22. The method of claim 20 , further comprising claim 20 , between ...

LOW-LOSS OPTICAL FIBER OVER WIDE WAVELENGTH RANGE AND METHOD OF MANUFACTURING THE SAME

A low-loss optical fiber over wide wavelength range includes a transmission loss of less than or equal to 40 dB/km in a whole wavelength range of 400-1400 nm, and being manufactured by drawing an optical fiber preform including a core composed of a silica glass having a hydroxyl-group concentration of less than or equal to 1 ppm and a cladding composed of a silica glass having a fluorine concentration of more than or equal to 3.2 wt %. 1. A low-loss optical fiber over wide wavelength range comprising a transmission loss of less than or equal to 40 dB/km in a whole wavelength range of 400-1400 nm , andbeing manufactured by drawing an optical fiber preform comprising a core composed of a silica glass having a hydroxyl-group concentration of less than or equal to 1 ppm and a cladding composed of a silica glass having a fluorine concentration of more than or equal to 3.2 wt %.2. The low-loss optical fiber over wide wavelength range according to claim 1 , wherein the fluorine concentration is less than or equal to 7.2 wt %.3. The low-loss optical fiber over wide wavelength range according to claim 1 , wherein a transmission loss at a wavelength of 400 nm is less than or equal to 40 dB/km claim 1 , a transmission loss at a wavelength of 1300 nm is less than or equal to 10 dB/km claim 1 , and a maximum transmission loss in wavelengths of 1300-1400 nm is less than or equal to 40 dB/km.4. The low-loss optical fiber over wide wavelength range according to claim 2 , wherein a transmission loss at a wavelength of 400 nm is less than or equal to 40 dB/km claim 2 , a transmission loss at a wavelength of 1300 nm is less than or equal to 10 dB/km claim 2 , and a maximum transmission loss in wavelengths of 1300-1400 nm is less than or equal to 40 dB/km.5. The low-loss optical fiber over wide wavelength range according to claim 1 , wherein the optical fiber preform is composed by integrating a core preform which forms the core with a cladding preform which forms the cladding and is ...

SIDE EMITTING GLASS ELEMENT

Side emitting glass elements are provided that include a plurality of light guiding elements, which are inseparably connected to one another at their outer circumferential surfaces, and at least one scattering element. The scattering element is inseparably connected to the outer circumferential surface of at least one light guiding element. The light guiding elements have at least one glass with a refractive index n, wherein the individual light guiding elements are not enclosed by a cladding. A phase boundary is present between the light guiding elements through which the guided light can pass and to reach the scattering element. 1. A side emitting glass element , comprising:a plurality of light guiding elements of a glass having a first refractive index and an outer circumferential surface, the plurality of light guiding elements being inseparably connected to one another at the outer circumferential surfaces so that a phase boundary is present between the plurality of light guiding elements; andat least one scattering element inseparably connected to the outer circumferential surface of at least one of the plurality of light guiding elements so that when light is guided in the glass element, a portion of the light is laterally emitted from the glass element,wherein the plurality of light guiding elements are not individually enclosed by cladding glass.2. The side emitting glass element according to claim 1 , wherein claim 1 , when light is guided in the glass element claim 1 , the phase boundary provides a balance between a portion of light guided in the plurality of light guiding elements and light passing through the phase boundary and reaching the at least one scattering element.3. The side emitting glass element according to claim 1 , wherein the light guiding elements and the at least one scattering element are connected to one another in a form-fit manner.4. The side emitting glass element according to claim 1 , further comprising an outer circumferential ...

Graphite heating furnace

A gas supplying unit supplies a nitrogen gas into a furnace body of a graphite heating furnace in which at least a part of the furnace body is formed with a graphite. An exhausting unit exhausts a gas inside the furnace body to outside the furnace body. A dew-point temperature of the nitrogen gas supplied into the furnace body is equal to or lower than −80° C. A pressure inside the furnace body is equal to or higher than 140 Pa with respect to an atmospheric pressure outside the furnace body.

Multi-Core Optical Fibers for IR Image Transmission

An optical fiber comprising non-silica, specialty glass that has multiple fiber cores arranged in a square registered array. The fiber cores are “registered” meaning that the array location of any fiber core is constant throughout the entire length of the fiber, including both ends. Optical fiber bundles are fabricated by combining multiple multi-core IR fibers with square-registration. Also disclosed is the related method for making the optical fiber.

Method for manufacturing preform for photonic band gap fiber, method for manufacturing photonic band gap fiber, preform for photonic band gap fiber, and photonic band gap fiber

A photonic band gap fiber 1 includes a hollow core region 10 and a band gap region 27 in a honeycomb shape surrounding the core region 10 and having a plurality of holes 21 formed in a glass body 22 . The holes 21 are surrounded by columnar glass bodies 25 disposed on three alternate apexes of a hexagon HEX and plate glass bodies 26 disposed so as to join the columnar glass bodies 25 to the other three apexes of the hexagon HEX. The columnar glass bodies 25 are disposed in a triangular lattice shape.

METHOD FOR PRODUCING A SUBSTRATE TUBE OF QUARTZ GLASS

A method for producing substrate tubes of quartz glass includes continuously supplying a hollow cylinder of quartz glass to a heating zone, softening the hollow cylinder zonewise in the heating zone, and drawing off a tubular strand from the softened portion. The hollow cylinder has an outer diameter C, an inner diameter Cand an inner bore. The tubular strand has an outer diameter Tand an inner diameter T. The following parameters are applicable to the hollow cylinder and the tubular strand: C>180 mm, C>3 with C=C/C, T<1.6 with T=T/Tand C/T<2.5. The blow pressure in an inner bore is adjusted to a value in the range of 4 to 10 mbar. Substrate tubes, obtained by cutting the tubular strand to the desired length, serve as semi-finished products for the manufacture of preforms for optical fibers. 1. A method for producing a substrate tube of quartz class , comprising:{'b': '3', 'sub': a', 'i, 'continuously supplying a hollow cylinder of quartz glass to a heating zone (), the hollow cylinder having an outer diameter C, an inner diameter Cand an inner bore;'}{'b': '3', 'zonewise softening the hollow cylinder in the heating zone (); and'}{'b': 12', '12, 'sub': a', 'i, 'claim-text': [{'b': '13', 'wherein a blow pressure is produced in an inner bore () is in the range of 4 to 10 mbar, and'}, {'b': 4', '12, 'claim-text': [{'br': None, 'sub': 'a', 'C>180 mm,'}, {'br': None, 'i': C', 'C', '=C', '/C, 'sub': r', 'r', 'a', 'i,, '>3 with'}, {'br': None, 'i': T', 'T', '=T', '/T, 'sub': r', 'r', 'a', 'i, '<1.6 with , and'}, {'br': None, 'i': C', '/T, 'sub': i', 'i, '<2.5.'}], 'wherein the following parameters are applicable to the hollow cylinder () and the tubular strand ()], 'drawing off a tubular strand () from a softened portion of the hollow cylinder, the tubular strand () having an outer diameter Tand an inner diameter T,'}2. The method according to claim 1 , wherein the blow pressure is in the range of 6 to 8 mbar claim 1 , and wherein the following parameters are applicable to ...

FORMATION OF ELONGATED GLASS COMPONENTS WITH LOW BOW USING A GRIPPER DEVICE

Apparatus and method for producing elongated glass components with low bow. The apparatus may include a heating element to heat a bulk glass component where a strand may be drawn from the bulk glass component in a downward direction and a gripper device including a clamping element to support the strand while pulling or drawing it from the bulk glass component in a linear motion, and a low-friction mounting element attached to the clamping element which allows translational movement of the clamping element in an x-y plane. The gripper device may further be used to reduce bow in the strand while it is being drawn by moving the clamping element on the mounting element in a direction opposite the direction of any measured transverse acceleration. 1. An apparatus for forming an elongated component of glass with low bow , the apparatus comprising:a heating element to heat a bulk glass component where a strand may be drawn from the bulk glass component in a downward z direction; and a clamping element to support the strand and move linearly with the strand while it is drawn from the bulk glass component, and', 'a low-friction mounting element attached to the clamping element which allows translational movement of the clamping element in an x-y plane,', 'wherein a force applied to the clamping element by an external object will result in the clamping element being deflected along the mounting element., 'a gripper device, wherein the gripper device comprises2. The apparatus of claim 1 , wherein the apparatus further comprises a strand-center sensing element claim 1 , wherein the strand-center sensing element detects the position of the strand relative to the position of the clamping element.3. The apparatus of claim 1 , wherein the mounting element comprises an x-y table including a pair of arms mounted on linear bearings or linear rails.4. The apparatus of claim 3 , further comprising a motor to control movement of the pair of arms.5. The apparatus of claim 1 , wherein the ...

Method for producing an integral bond between components of quartz glass and heating burner suited therefor

Known heating burners for producing a welded joint between components of quartz glass include a burner head in which at least one burner nozzle is formed, a burner-head cooling system for the temperature control of the burner head and a supply line connected to the burner nozzle for a fuel gas. Starting from this, to modify a heating burner in such a way that impurities in the weld seam between quartz-glass components to be connected are largely avoided, it is suggested that the burner head should include a base body of silver or of a silver-based alloy.

OPTICAL FIBERS, METHODS OF THEIR FORMATION, AND METHODS OF THEIR USE

An example of an optical fiber includes an attenuating cladding disposed around a first waveguide (e.g., a core) and a waveguide (e.g., a waveguide cladding) disposed around the attenuating cladding. An attenuating cladding may be a doped layer that may be doped with, for example, a dopant comprising metal. A first waveguide and a second waveguide may each transmit light for a distinct sample characterization technique. An example of an optical fiber includes a core, a first intermediate cladding disposed around the core, an attenuating cladding disposed around the first intermediate cladding, an attenuating cladding disposed around the first intermediate cladding, a second intermediate cladding disposed around the attenuating cladding, a waveguide cladding disposed around the second intermediate cladding, and outer cladding disposed around the waveguide cladding, and an outer coating around the outer cladding. An optical fiber may be formed using a rod-in-tube process. 1. An optical fiber (e.g. , a characterization fiber) comprising a first waveguide (e.g. , a core) , an attenuating cladding disposed around the first waveguide , and a second waveguide (e.g. , a waveguide cladding) disposed around the attenuating cladding.2. The optical fiber of claim 1 , wherein the attenuating cladding comprises a dopant.3. The optical fiber of or claim 1 , wherein the attenuating cladding comprises a glass claim 1 , wherein the dopant is dispersed within the glass.4. The optical fiber of or claim 1 , wherein the dopant comprises a metal.5. The optical fiber of claim 4 , wherein the dopant comprises a metallic oxide or a metallic chloride.6. The optical fiber of claim 5 , wherein the dopant is a pure metal.7. The optical fiber of or claim 5 , wherein the dopant comprises boron.8. The optical fiber of or claim 5 , wherein the dopant comprises one or more Rayleigh scatterers.9. The optical fiber of any one of the preceding claims claim 5 , wherein the attenuating cladding is opaque. ...

OPTICAL FIBER WITH REDUCING HYDROGEN SENSITIVITY

The present disclosure is directed to a method of making an optical fiber with improved bend performance, the optical fiber having a core and at least one cladding layer, and a chlorine content in the in the last layer of the at least one cladding layer that is greater than 500 ppm by weight. The fiber is prepared using a mixture of a carrier gas, a gaseous chlorine source material and a gaseous reducing agent during the sintering of the last or outermost layer of the at least one cladding layer. The inclusion of the reducing gas into a mixture of the carrier gas and gaseous chlorine material reduces oxygen-rich defects that results in at least a 20% reduction in TTP during hydrogen aging testing. 1. A method of producing an optical fiber comprising:providing a preform having a consolidated glass core and a first porous glass cladding layer;exposing the preform to a first gas atmosphere at a first temperature, the first gas atmosphere comprising a chlorine source material, the chlorine source material providing chlorine for doping the first porous glass cladding layer;exposing the preform to a second gas atmosphere at a second temperature; the second gas atmosphere comprising a reducing agent; andheating the preform in the presence of the second gas atmosphere at a third temperature; the heating causing sintering of the first porous glass cladding layer, the sintered first porous glass cladding layer having a chlorine dopant concentration of at least 500 ppm by weight.2. The method of claim 1 , wherein the first temperature is at least 800° C. claim 1 , the second temperature is greater than or equal to the first temperature claim 1 , and the third temperature is greater than or equal to the second temperature.3. The method of claim 2 , wherein the first temperature is at least 1050° C. and the third temperature is at least 1300° C.4. The method of claim 1 , wherein the chlorine source material is Cl claim 1 , SiCl claim 1 , or CCland wherein the reducing agent is ...

METHOD OF MAKING OPTICAL FIBERS IN A REDUCING ATMOSPHERE

A method for forming an optical fiber preform and fibers drawn from the preform. The method includes forming a soot cladding monolith, inserting a consolidated core cane into the internal cavity, and processing the resulting core-cladding assembly to form a preform. Processing may include exposing the core-cladding assembly to a drying agent and/or dopant precursor, and sintering the core-cladding assembly in the presence of a reducing agent to densify the soot cladding monolith onto the core cane to form a preform. The preform features low hydroxyl content and low sensitivity to hydrogen. Fibers drawn from the preform exhibit low attenuation losses from absorption by the broad band centered near 1380 nm. 1. A method of producing an optical fiber comprising:providing a porous soot cladding monolith, said soot cladding monolith including a first porous glass cladding layer and having an internal cavity;inserting a core cane into said internal cavity to form a core-cladding assembly, said core-cladding assembly including a channel between said core cane and said soot cladding monolith;exposing said core-cladding assembly to a first gas atmosphere at a first temperature, said first gas atmosphere comprising a chlorine source material, said chlorine source material providing chlorine for doping said first porous glass cladding layer;exposing said core-cladding assembly to a second gas atmosphere at a second temperature, said second gas atmosphere comprising a reducing agent; andheating said core-cladding assembly in the presence of said second gas atmosphere at a third temperature, said heating causing sintering of said first porous glass cladding layer, said sintered first porous glass cladding layer having a chlorine dopant concentration of at least 500 ppm by weight.2. The method of claim 1 , wherein said first temperature is at least 800° C. claim 1 , said second temperature is greater than or equal to said first temperature claim 1 , and said third temperature is ...

Method of manufacturing porous glass preform for optical fiber

A method of manufacturing a porous glass preform includes depositing glass particles on an outer periphery of a target rod while a burner for synthesizing glass particles and the target rod that is rotating are relatively reciprocated, wherein V and r are gradually reduced while a variation in sweeping pitch P [mm] expressed as V/r is caused to be within a range of a central value±10% when a glass particle deposition layer of a portion satisfying a relation 0.5L≦R≦0.8L is synthesized; where a final outer diameter of the manufactured porous glass preform for an optical fiber is L [mm], an outer diameter of a glass particle deposition body in the middle of the manufacture is R [mm], a rotating speed of the target rod is r [rpm], and a relative moving speed between the target rod and the burner is V [mm/min.].

METHOD AND APPARATUS FOR CREATING COHERENT BUNDLE OF SCINTILLATING FIBERS

A method and apparatus to manufacture a coherent bundle of scintillating fibers is disclosed. A method includes providing a collimated bundle having a glass preform with capillaries therethrough known in the industry as a glass capillary array, and infusing the glass capillary array with a scintillating polymer or a polymer matrix containing scintillating nanoparticles. 1. A method comprising:providing a collimated bundle having a glass preform with a plurality of capillaries therethrough known in the industry as a glass capillary array; andinfusing the glass capillary array with a scintillating polymer or a polymer matrix containing scintillating nanoparticles.2. The method of wherein a low index reflective metal coating is formed as an interfacial layer between the scintillating polymer and the glass cladding.3. The method of further comprising:placing the collimated bundle in a pressure vessel;applying pressure to the high refractive index scintillating polymer or polymer matrix;driving it into the capillaries; andapplying a back pressure to the collimated bundle, the back pressure reducing the risk of failure of the collimated bundle.4. The method of wherein the back pressure is applied by a high pressure gas.5. The method of wherein the transparent scintillating polymer is triphenylbismuth/polyvinylcarbazole claim 1 , or other scintillation polymers with a higher refractive index than the cladding.6. The method of wherein the scintillating polymer contains high refractive index nanoparticles.7. The method of wherein the high refractive index nanoparticles are zirconium dioxide (ZrO2) claim 6 , hafnium dioxide (HfO) or titanium dioxide (TiO)).8. The method of where the cladding glass is optically absorbing to the emitted photons of the scintillating material.9. The method of wherein there is a low refractive claim 8 , transparent interfacial layer between core and cladding claim 8 , with the interfacial layer being less than 1 micron in thickness claim 8 , this ...

Spun round core fiber

Optical waveguide cores having refractive index profiles that vary angularly about a propagation axis of the core can provide single-mode operation with larger core diameters than conventional waveguides. An optical waveguide includes a core that extends along a propagation axis and has a refractive index profile that varies angularly about the propagation axis. The optical waveguide also includes a cladding disposed about the core and extending along the propagation axis. The refractive index profile of the core varies angularly along a length of the propagation axis.

HIGH CHLORINE CONTENT LOW ATTENUATION OPTICAL FIBER

An optical fiber having a core comprising silica and greater than 1.5 wt % chlorine and less than 0.5 wt % F, said core having a refractive index Δ, and a inner cladding region having refractive index Δsurrounding the core, where Δ>Δ. 1. A single mode optical fiber comprising:{'sub': 1MAX', '2MIN', '1MAX', '2MIN, 'a core comprising silica and greater than or equal to 1.5 wt % chlorine and less than 0.6 wt % F, said core having a refractive index Δ, and a cladding region having refractive index Δsurrounding the core, where Δ>Δ, and wherein said fiber is single moded at 1550 nm.'}2. The optical fiber of claim 1 , wherein said cladding region comprises fluorine claim 1 , and the molar ratio of chlorine in the core to fluorine in the cladding is greater than 1.3. The single mode optical fiber of claim 1 , wherein said core comprises greater than 2 wt % chlorine.4. The single mode optical fiber of claim 1 , wherein said core comprises greater than 3 wt % chlorine.5. The single mode optical fiber of claim 1 , wherein said core comprises greater than 4 wt % chlorine.6. The single mode optical fiber of claim 1 , wherein said core is essentially free of fluorine.7. The single mode optical fiber of claim 2 , wherein said fiber is essentially free of fluorine.8. The single mode fiber of claim 2 , wherein said cladding comprises an inner cladding comprising fluorine and an outer cladding region surrounding the inner cladding region claim 2 , said outer cladding region having refractive index Δ claim 2 , wherein Δ>Δ>Δ.9. The single mode optical fiber of claim 2 , wherein said cladding comprises from greater than or equal to about 0.1 weight % fluorine to less than or equal to about 1 weight % fluorine.10. The single mode optical fiber of claim 1 , wherein the core has a maximum relative refractive index claim 1 , Δ claim 1 , from greater than or equal to about 0.15% to less than or equal to about 0.5%.11. The single mode optical fiber of claim 2 , wherein said cladding has a ...

SPUN ROUND CORE FIBER

Optical waveguide cores having refractive index profiles that vary angularly about a propagation axis of the core can provide single-mode operation with larger core diameters than conventional waveguides. In one representative embodiment, an optical waveguide comprises a core that extends along a propagation axis and has a refractive index profile that varies angularly about the propagation axis. The optical waveguide can also comprise a cladding disposed about the core and extending along the propagation axis. The refractive index profile of the core can vary angularly along a length of the propagation axis. 1. An optical waveguide , comprising:a core that extends along a propagation axis, the core having a refractive index profile that varies angularly about the propagation axis; anda cladding disposed about the core and extending along the propagation axis;wherein the refractive index profile of the core varies angularly along a length of the propagation axis.2. The optical waveguide of claim 1 , wherein the refractive index profile of the core varies radially about the propagation axis.3. The optical waveguide of claim 1 , wherein the refractive index profile of the core is periodic along the propagation axis.4. The optical waveguide of claim 1 , wherein the refractive index profile of the core is aperiodic along the propagation axis.5. The optical waveguide of claim 1 , wherein the refractive index profile of the core is configured to attenuate one or more higher order modes.6. The optical waveguide of claim 1 , wherein the refractive index profile of the core is radially asymmetric about the propagation axis.7. The optical waveguide of claim 1 , wherein the refractive index profile of the core is angularly asymmetric about the propagation axis.8. The optical waveguide of claim 1 , wherein the core has a round cross-section.9. The optical waveguide of claim 1 , wherein the core comprises one or more mode-discriminating regions.10. The optical waveguide of claim ...

Quartz glass tube as a semi-finished product for an optical component and method for producing said quartz glass tube

A quartz glass tube as a semi-finished product for an optical component that has an inner bore extending along a tube centre axis for the acceptance of a core rod and a tube wall limited by an inner casing surface and an outer casing surface is already known; within said tube wall an inner region made of a first quartz glass and an outer region made of a second quartz glass with a different index of refraction surrounding the inner region contact one another at a contact surface which runs around the centre axis. In order to provide a quartz glass on this basis that facilitates the production of optical components for special applications such as laser-activated optical components in wand or fibre form, the invention states that the contact surface has a non-round course in the radial cross-section and the inner casing surface has a circular course.

Method and apparatus for continuous or batch preform and optical fiber production

The present invention relates to a method and apparatus for fiber and/or fiber perform production and in particular, optical fiber and optical fiber preform production in which a fiber substrate and a multilayered preform can be continuously produced. The layered preform is constructed from particles deposited from one or more aerosol streams containing multicomponent particles wherein individual particles have the ratio of components as desired in the perform layer. Preferably, the components of the aerosol particles have a sub-particle structure in which the subparticle structure dimensions are smaller than the particle diameter and more preferably smaller than the wavelength of light and more preferably on the molecular scale. Preferably, the particles are deposited on the perform substrate via one or more deposition units. Multiple deposition units can be operated simultaneously and/or in series. As the preform is synthesized, it can be simultaneously fed into a drawing furnace for continuous production of fiber. The method can also be used for batch production of fiber preforms and fiber. 1. A method for the production of performs and/or fiber comprising the steps of:a) Introducing a preform substrate material in molten, pellet or powder form into an extruder or mold so as to form a preform substrate when desired;b) Inserting a preform substrate into a preform reactor;c) Introducing one or more carrier gases and one or more deposition particles or deposition particle precursor particles and/or particle precursor gases into the perform reactor wherein the particles and/or particle precursors contain a matrix material and one or more doping agents to alter one or more properties of the matrix material;d) Forming and/or conditioning the deposition particle precursor particles if desired;e) Applying a force to the deposition particles essentially in the direction of the preform substrate to enhance the deposition particles in a deposition enhancer;f) Depositing all ...

Polarization controller and method of manufacture

A polarization controller comprising: (i) an optical fiber, and (ii) a carrier surrounding the optical fiber, the carrier comprising an off-center through hole with at least one collapsed region, such that the optical fiber is situated within the through hole and contacts the at least one collapsed region of the through hole, and the collapsed region exerts pressure on the optical fiber.

Optical fiber for a fiber laser, fiber laser, and production method for optical fiber for a fiber laser

An optical fiber for a fiber laser includes a core to which a rare-earth element is added, a first cladding formed around the core; and a second cladding formed around the first cladding, and excitation light is guided from at least one end of the first cladding to excite the rare-earth element to output a laser oscillation light. An addition concentration of the rare-earth element to the core is different in a longitudinal direction of the optical fiber for a fiber laser, and a core diameter and a numerical aperture of the optical fiber for a fiber laser are constant in the longitudinal direction of the optical fiber for a fiber laser.

Viscocity-Reducing Dopants In Optical Fibers

An optical preform manufacturing process is disclosed in which an alkali dopant is deposited between an optical fiber core rod and an optical fiber cladding jacket. Depositing the alkali dopant between the core rod and the cladding jacket permits diffusion of the alkali dopants into the core during fiber draw when the core and the cladding are at their respective transition (or vitrification) temperatures. Introduction of the alkali dopants between the core rod and the cladding jacket also permits decoupling of the alkali doping process from one or more of other optical preform manufacturing processes. The optical preform manufacturing process can also include placing alkali dopants between an optical fiber inner cladding jacket and an optical fiber outer cladding jacket to reduce the glass viscosity during fiber draw.

SYSTEM AND METHOD FOR MANUFACTURING OPTICAL FIBER

A system for receiving optical fiber in microgravity including a spool portion to hold optical fiber created in microgravity, a catching mechanism to secure the fiber end to the spool and a capturing device that is extendable from near and retractable to near the spool portion to pull the optical fiber to the spool portion. 1. A system for receiving optical fiber in microgravity , the system comprising:a spool portion to hold optical fiber created in microgravity;a catching mechanism to secure the fiber end to the spool; anda capturing device that is extendable from near and retractable to near the spool portion to pull the optical fiber to the spool portion.2. The system according to claim 1 , wherein the catching mechanism comprises a grip that is triggered to cease receiving optical fiber once a predefined amount of fiber is in contact with the spool.3. The system according to claim 2 , wherein the grip is at least one of magnetically driven and spring-driven.4. The system according to claim 2 , wherein the grip is triggered based on at least one of a predefined amount of pressure applied by at least one of the capturing device and the optical fiber claim 2 , and a control mechanism.5. The system according to claim 1 , wherein the spool portion further comprise at least one of a friction lock and a v-catch to engage the optical fiber as it is spooled.6. The system according to claim 1 , wherein a surface where the optical fiber contacts the spool portion comprises a sticky material.7. The system according to claim 1 , further comprising a cutting mechanism cut the optical fiber once the spool portion has a defined amount of optical fiber on the spool portion.8. The system according to claim 1 , wherein the spool portion comprises an endoscopic spool component which controls opening and closing of the capturing device.9. The system according to claim 8 , wherein the endoscopic spool component controls placement of the capturing device to retrieve the optical fiber ...

PREPARATION OF A QUARTZ GLASS BODY IN A STANDING SINTER CRUCIBLE

The invention relates to a process for the preparation of a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate, ii.) Making a glass melt out of silicon dioxide granulate in an oven and iii.) Making a quartz glass body out of at least part of the glass melt, wherein the oven comprises a standing sinter crucible. The invention further relates to a quartz glass body which is obtainable by this process. The invention further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body. 118-. (canceled)19. A process for the preparation of a quartz glass body comprising: [{'sup': '2', 'a BET surface area in a range from 20 to 50 m/g; and'}, 'a mean particle size in a range from 50 to 500 μm;, 'providing a silicon dioxide granulate, wherein the silicon dioxide granulate was prepared from pyrogenic silicon dioxide, wherein the silicon dioxide granulate comprisesmaking a glass melt out of the silicon dioxide granulate in an oven; andmaking a quartz glass body out of the glass melt;wherein the oven comprises a standing sinter crucible.20. The process according to claim 19 , wherein the sinter crucible is made of a sinter material claim 19 , which comprise a sinter metal selected from the group consisting of molybdenum claim 19 , tungsten and a combination thereof.21. The process according to claim 20 , wherein the sinter metal of the sinter crucible has a density of 85% or more of the theoretical density of the sinter metal.22. The process according to claim 19 , wherein the BET surface area is not reduced to less than 5 m/g before making the glass melt out of the silicon dioxide granulate in the oven.23. The process according to claim 19 , wherein the standing sinter crucible comprises at least one of:an area formed as a standing surface;at least two sealed on rings as side parts;a nozzle;a mandrel;at least one gas inlet;at least one gas outlet; anda lid.24. The ...

PHOTONIC BAND GAP FIBERS USING A JACKET WITH A DEPRESSED SOFTENING TEMPERATURE

The present invention is generally directed to a photonic bad gap fiber and/or fiber preform with a central structured region comprising a first non-silica based glass and a jacket comprising a second non-silica based glass surrounding the central structured region, where the Littleton softening temperature of the second glass is at least one but no more than ten degrees Celsius lower than the Littleton softening temperature of the first glass, or where the base ten logarithm of the glass viscosity in poise of the second glass is at least 0.01 but no more than 2 lower than the base ten logarithm of the glass viscosity in poise of the first glass at a fiber draw temperature. Also disclosed is a method of making a photonic bad gap fiber and/or fiber preform 1. A photonic band gap fiber preform , comprising:a central structured region comprising a first non-silica based glass, wherein the first glass has a Littleton softening temperature; anda jacket comprising a second non-silica based glass, wherein the second glass comprises a different composition than the first glass, wherein the jacket surrounds the central structured region, and wherein the second glass has a Littleton softening temperature;wherein the Littleton softening temperature of the second glass is at least one but no more than ten degrees Celsius lower than the Littleton softening temperature of the first glass.2. The fiber preform of claim 1 , wherein the first glass and second glass are individually selected from the group consisting of chalcogenide glass claim 1 , chalcohalide glass claim 1 , oxide glass claim 1 , silicate glass claim 1 , germanate glass claim 1 , phosphate glass claim 1 , borate glass claim 1 , gallate glass claim 1 , tellurite glass claim 1 , and halide glass.3. The fiber preform of claim 1 , wherein when the fiber preform is heated claim 1 , the second glass flows into and fills any voids between the central structured region and the jacket.4. The fiber preform of claim 1 , ...

OPTICAL FIBER GLASS PREFORM AND METHOD FOR DRAWING OPTICAL FIBER GLASS PREFORM

Provided is an optical fiber glass preform, in a preliminary step of a final drawing step, in which the optical fiber glass preform is undergone one or more drawing steps to be drawn to a final target diameter, wherein as an outer diameter of an effective portion of the glass preform is continuously measured in a longitudinal direction, and from outer diameter measurement results obtained, a regression line of y=ax+b is obtained using the least squares method with y as the outer diameter and x as a length, an absolute value of a slope a is less than or equal to 0.005 mm/mm; and a maximum value of an obtained absolute value of a curvature of the outer diameter at any given point, in the outer diameter measurement results obtained, is 0.003 or less. 1. An optical fiber glass preform , in a preliminary step of a final drawing step , in which the optical fiber glass preform undergoes one or more drawing steps to be drawn to a final target diameter , whereinwhen an outer diameter of an effective portion of the glass preform is continuously measured in a longitudinal direction, and from outer diameter measurement results obtained, a regression line of y=ax+b is obtained using the least squares method with y as the outer diameter and x as a length, an obtained absolute value of a slope a is less than or equal to 0.005 mm/mm; and a maximum value of an absolute value of a curvature of the outer diameter at any given point, in the outer diameter measurement results obtained, is 0.003 or less.2. The optical fiber glass preform according to claim 1 , wherein the optical fiber glass preform is then further drawn for one or more times to be processed to a final target diameter before being used in a subsequent process.3. The optical fiber glass preform according to claim 2 , wherein when the outer diameter the effective portion of the optical fiber glass preform in its original shape before drawing is continuously measured in the longitudinal direction claim 2 , and from the ...

Methods for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending

Methods for producing a semifinished part for the manufacture of an optical fiber are disclosed. The methods are optimized in terms of bending. The methods include the steps of providing a shell tube with a shell refractive index which is lower in relation to the light-conducting core. Then, at least one protective, intermediate and/or barrier layer is applied to a radially outermost and/or innermost tube surface of the respective shell tube, wherein a build-up of light-conducting layers is realized on the inner side and/or the outer side of the shell tube. Finally, the shell tubes are joined by collapsing so as to form the semifinished part.

SYSTEM FOR MANUFACTURING FUMED SILICA PARTICLES

The present disclosure provides a system for generating fumed silica particles for manufacturing of an optical fiber preform. The system includes a generator and a plurality of inlets connected with the generator. The generator includes a plurality of burners. The plurality of inlets include a first inlet, a second inlet, a third inlet and a fourth inlet. The first inlet provides passage for flow of a precursor material to the generator. The second inlet provides passage for flow of a first gas to the generator. The third inlet provides passage for flow of a second gas to the generator. The fourth inlet provides passage for flow of a carrier gas to the generator. The plurality of burners enables a chemical reaction between the precursor material, the first gas and the second gas that facilitates the generation of the fumed silica particles. 1. A method for generating fumed silica particles for use in manufacturing an optical fiber preform , the method comprising:receiving a precursor material along with one or more combustion gases, wherein the precursor material along with the make up oxygen is received in the generator;receiving a first gas in the generator;receiving a second gas in the generator;receiving a carrier gas in the generator; andraising the temperature inside the generator to enable a chemical reaction between the precursor material, the first gas and the second gas, wherein the chemical reaction between the precursor material, the first gas and the second gas generates the fumed silica particles of per predefined size.2. The method as recited in claim 1 , wherein the precursor material is at least one of silicon tetrachloride (SiCl) or octamethylcyclotetrasiloxan (OMCTS).3. The method as recited in claim 1 , wherein the first gas is oxygen.4. The method as recited in claim 1 , wherein the second gas is methane CHwhen the precursor material is octamethylcyclotetrasiloxan (OMCTS).5. The method as recited in claim 1 , wherein the combustion gas is make ...

METHOD FOR SINTERING OF AN OPTICAL FIBRE PREFORM

The present disclosure provides a method for sintering of an optical fiber preform. The method includes preheating of the optical fiber preform in a sintering chamber. In addition, the method includes first downfeeding of the optical fiber preform into a sintering furnace in the presence of helium gas and chlorine gas. The first downfeeding of the optical fiber preform facilitates sintering of an outer layer of the optical fiber preform. Further, the method includes pulling out the optical fiber preform from the sintering furnace in presence of chlorine gas and at least one of nitrogen gas and helium gas. Further, the method includes second down feeding of the optical fiber preform in the sintering furnace in the presence of nitrogen gas and chlorine gas. The second downfeeding of the optical fiber preform facilitates sintering of the optical fiber preform. 1. A method for sintering of an optical fibre perform , the method comprising:preheating of the optical fiber preform, wherein preheating of the optical fiber preform is done in a sintering chamber;performing first downfeeding of the optical fiber preform into a sintering furnace; andperforming second downfeeding of the optical fiber preform into the sintering furnace.2. The method as claimed in claim 1 , wherein the first downfeeding and the second downfeeding of the optical fiber preform into a sintering furnace is done in presence of helium gas and chlorine gas.3. The method as claimed in claim 1 , wherein preheating of the optical fiber preform enables diffusion of helium gas inside the optical fiber preform.4. The method as claimed in claim 1 , wherein the sintering chamber is filled with helium gas and chlorine gas.5. The method as claimed in claim 1 , wherein the first downfeeding of the optical fiber preform into the sintering furnace comprises sintering of an outer layer of the optical fiber preform.6. The method as claimed in claim 1 , further comprising pulling out the optical fiber preform from the ...

METHOD FOR MANUFACTURING OF OPTICAL FIBRE PREFORM

The present disclosure provides a method for manufacturing of an optical fiber preform. The method includes a first step of compacting silica particles using a pressing die and punching machine. The silica particles are loaded into a cavity of the pressing die surrounding a cylindrical rod. The silica particles are compacted to form compact object with a predefined shape. The method includes another step of sintering the compacted object with the cylindrical rod to form the optical fiber preform. The sintering of the compact object is performed in a gaseous environment. The method facilitates the manufacturing of the optical fiber preform that is cone free for the reduction of material loss during manufacturing of the optical fiber preform. 1. A method for manufacturing of an optical fiber preform comprising:compacting silica particles to form compact a compacted object of a predefined shape; andsintering the compacted object along with the cylindrical rod to form the optical fiber preform, wherein sintering of the compacted object is performed in a controlled atmosphere.2. The method as claimed in claim 1 , wherein the optical fiber preform is cone free.3. The method as claimed in claim 1 , wherein compacting silica particles further comprising applying a predefined pressure on the silica particles.4. The method as claimed in claim 1 , wherein the optical fiber preform is defined by a top surface claim 1 , a bottom surface and one or more surfaces claim 1 , wherein the top surface and the bottom surface are one of a flat surface and a curvature surface.5. The method as claimed in claim 1 , wherein the controlled atmosphere comprises at least one of a chlorine gas claim 1 , helium gas claim 1 , argon gas claim 1 , and a nitrogen gas.6. The method as claimed in claim 1 , wherein the predefined shape corresponds to the shape of the pressing die.7. The method as claimed in claim 1 , wherein the silica particles are compacted in a mold assembly.8. The method as claimed ...

Thermal history-based etching

A method for adjusting an etchability of a first borosilicate glass by heating the first borosilicate glass; combining the first borosilicate glass with a second borosilicate glass to form a composite; and etching the composite with an etchant. A material having a protrusive phase and a recessive phase, where the protrusive phase protrudes from the recessive phase to form a plurality of nanoscale surface features, and where the protrusive phase and the recessive phase have the same composition.

METHOD FOR CONNECTING MULTI-CORE FIBER, MULTI-CORE FIBER, AND METHOD FOR MANUFACTURING MULTI-CORE FIBER

A multicore fiber includes a plurality of cores disposed at predetermined intervals and surrounded by a cladding . The multicore fiber also includes a marker formed apart from the cores . The refractive index of the marker is different from those of the cores and the cladding . For example, the marker may be made of a material having lower refractive index than that of the cladding . In this case, for example, the cores may be made of germanium-doped quartz. The cladding may be made of pure quartz. The marker may be made of fluorine-doped quartz. Further, the marker may be an empty hole. 1. A method for fusion splicing a multicore fiber in which at least one of objects to be spliced together is a multicore fiber including a plurality of core portions , a cladding portion surrounding the plurality of core portions , and a marker portion disposed apart from the plurality of core portions , the method comprising:disposing the multicore fiber to face an object to be spliced that includes a marker corresponding to the marker portion;determining a position of each of the core portions of the multicore fiber by use of the marker portion, and conducting rotation core alignment of the position with a position of a desired core portion of the object to be spliced; andfusing the multicore fiber with the object to be spliced.2. The method of claim 1 , wherein at least one marker portion is disposed at a position shifted from an arbitrary line-symmetric axis with respect to a disposition of the plurality of core portions on a cross-sectional surface of the multicore fiber.3. The method of claim 1 , wherein two or more types of the marker portions are provided claim 1 , and some or all of the marker portions are positioned substantially perpendicularly to each other on a cross-sectional surface of the multicore fiber.4. The method of claim 1 , wherein the multicore fiber and the object to be spliced are fused together by discharges of three electrodes disposed in three directions ...

METHOD OF MAKING AN IMAGING FIBRE APPARATUS AND OPTIAL FIBRE APPARATUS WITH DIFFERENT CORE

A method of forming an imaging fibre apparatus comprises arranging rods to form a plurality of stacks each comprising a respective plurality of rods, wherein: for each stack, the respective plurality of rods comprises rods having different core sizes, the rods of different core sizes being arranged in a selected arrangement, and the rods of different core sizes being arranged such that each stack has a respective selected shape; wherein the selected shape or shapes are such that the stacks stack together in a desired arrangement; the method further comprising: drawing each of the plurality of stacks; stacking together the plurality of drawn stacks together in the desired arrangement to form a further stack; drawing the further stack; and using the drawn further stack to form an imaging fibre apparatus, wherein the selected arrangement of the rods in each stack and the selected shape or shapes of the stacks are such that the further stack comprises a repeating pattern of rods of different core sizes. 1. A method of forming an imaging fibre apparatus comprising:arranging rods to form a plurality of stacks each comprising a respective plurality of rods, wherein:for each stack, the respective plurality of rods comprises rods having different core sizes, the rods of different core sizes being arranged in a selected arrangement, and the rods of different core sizes being arranged such that each stack has a respective selected shape;wherein the selected shape or shapes are such that the stacks stack together in a desired arrangement;the method further comprising:drawing each of the plurality of stacks;stacking together the plurality of drawn stacks together in the desired arrangement to form a further stack;drawing the further stack; andusing the drawn further stack to form an imaging fibre apparatus,wherein the selected arrangement of the rods in each stack and the selected shape or shapes of the stacks are such that the further stack comprises a repeating pattern of rods ...

SINGLE MODE OPTICAL FIBERS WITH BRILLOUIN FREQUENCY-SHIFT MANAGEMENT

The single-mode optical fibers have a core region that includes an inner core region having a delta value Δand a radius rimmediately surrounded by an outer core region of radius rand a delta value Δ<Δ, wherein Δ-Δis in the range from 0.3% to 2%. A cladding region of radius rimmediately surrounds the core region. The inner and outer regions define an annular width δr=r−r. At least one of r, r, δr and rchanges with a period p in the longitudinal direction between first and second values each having a corresponding level distance d. The change occurs over a transition distance dsuch that d/d<0.1. The Brillouin frequency shift Δf changes by an amount δ[Δf] that is least 10 MHz over each period p, thereby allowing for Brillouin frequency-shift management in fiber-based sensor systems. 1. A single-mode optical fiber comprising a longitudinal direction and a Brillouin frequency shift Δf , comprising:{'sub': 1', '1', '2', '1', '2', '1', '2', '1', '2', '1', '2, 'a core region comprising an inner core region immediately surrounded by an outer core region, the inner core region comprising a delta value of Δand radius of r, and the outer core region comprising a delta value Δ<Δand a radius r>rand an annular width δr=r−r, wherein ris in the range from 3 μm to 10 μm and δr is in the range from 1 μm to 9 μm, and wherein Δ−Δis in the range from 0.3% to 2%;'}{'sub': 3', '2', '3', '2', '3, 'a cladding region immediately surrounding the outer core region and comprising a delta value of Δ<Δand a radius r>r, wherein ris in the range from 100 to 150 μm; and'}{'sub': 1', '2', '3', 'F', 'T', 'T', 'F, 'wherein at least one of r, r, δr and rchanges with a period p in the longitudinal direction between first and second values each comprising a level distance d, and wherein the change occurs over a transition distance dsuch that d/d<0.1 and wherein the Brillouin frequency shift Δf changes over each period by an amount δ[Δf] that is at least 10 MHz.'}2. The single-mode optical fiber according ...

OPTICAL FIBER WITH VARIABLE ABSORPTION

An optical fiber may comprise a core doped with one or more active ions to guide signal light from an input end of the optical fiber to an output end of the optical fiber, a cladding surrounding the core to guide pump light from the input end of the optical fiber to the output end of the optical fiber, and one or more inserts formed in the cladding surrounding the core. The core may have a geometry (e.g., a cross-sectional size, a helical pitch, and/or the like) that varies along a longitudinal length of the optical fiber, which may cause an absorption of the pump light to be modulated along the longitudinal length of the optical fiber. 1. An optical fiber , comprising:a core doped with one or more active ions to guide signal light from an input end of the optical fiber to an output end of the optical fiber;a cladding surrounding the core to guide pump light from the input end of the optical fiber to the output end of the optical fiber; and wherein the core has a geometry that varies along a longitudinal length of the optical fiber, and', 'wherein the geometry of the core is varied along the longitudinal length of the optical fiber to cause an absorption of the pump light to be modulated along the longitudinal length of the optical fiber., 'one or more inserts formed in the cladding surrounding the core,'}2. The optical fiber of claim 1 , wherein the geometry of the core that varies along the longitudinal length of the optical fiber comprises a cross-sectional size of the core that increases from the input end to the output end of the optical fiber.3. The optical fiber of claim 2 , wherein the cross-sectional size of the core increases from the input end to the output end of the optical fiber to cause the absorption of the pump light to increase along the longitudinal length of the optical fiber.4. The optical fiber of claim 2 , wherein at least one insert of the one or more inserts has a first refractive index claim 2 , wherein the cladding surrounding the core has ...

PREPARATION OF A QUARTZ GLASS BODY IN A MULTI-CHAMBER OVEN

The invention relates to a process for the preparation of a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate, wherein the silicon dioxide granulate was made from pyrogenic silicon dioxide powder and the silicon dioxide granulate has a BET surface area in a range from 20 to 40 m/g, ii.) Making a glass melt out of silicon dioxide granulate in an oven and iii.) Making a quartz glass body out of at least part of the glass melt, wherein the oven has at least a first and a further chamber connected to one another via a passage, wherein the temperature in the first chamber is lower than the temperature in the further chambers. The invention further relates to a quartz glass body which is obtainable by this process. The invention further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body. 1. A process for the preparation of a quartz glass body comprising the process steps: wherein the silicon dioxide granulate was made from pyrogenic silicon dioxide powder and the silicon dioxide granulate has the following feature;', {'sup': '2', 'A) A BET surface area in a range from 20 to 40 m/g'}], 'i) Providing a silicon dioxide granulate'}ii) Making a glass melt out of the silicon dioxide granulate in an oven;iii) Making a quartz glass body out of at least part of the glass melt; Wherein the first and further chambers are at different temperatures;', 'Wherein the temperature in the first chamber is lower than the temperature in the further chamber, 'wherein the oven has at least a first and a further chamber connected to one another by a passage,'}2. The process according to claim 1 , wherein there is an additive in the first chamber selected from the group consisting of halogens claim 1 , inert gas claim 1 , base claim 1 , oxygen or a combination of two or more of them.3. The process according to claim 2 , wherein the halogen is selected from the group consisting ...

STEAM TREATMENT OF SILICON DIOXIDE POWDER IN THE PREPARATION OF QUARTZ GLASS

The invention relates to a process for the preparation of a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate, ii.) Making a glass melt out of the silicon dioxide granulate and iii) Making a quartz glass body out of at least part of the glass melt, wherein the provision comprises the steps I. Providing a silicon dioxide powder with at least two particles made from a silicon-chlorine compound, II. Bringing the silicon dioxide powder into contact with steam to obtain a treated silicon dioxide powder and III. Granulating the treated silicon dioxide powder to obtain a silicon dioxide granulate, and wherein the chorine content of the silicon dioxide powder is greater than the chlorine content of the silicon dioxide granulate. The invention further relates to a quartz glass body which is obtainable by this process. The invention further relates to a process for providing a silicon dioxide granulate. The invention further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body. 120-. (canceled)21. A process for the preparation of a quartz glass body comprising: producing a silicon dioxide powder with at least two particles prepared from a silicon-chlorine compound;', 'bringing the silicon dioxide powder into contact with steam to obtain a treated silicon dioxide powder; and', 'granulating the treated silicon dioxide powder to obtain a silicon dioxide granulate;, 'providing a silicon dioxide granulate, wherein the provision comprisesmaking a glass melt out of the silicon dioxide granulate; andmaking a quartz glass body out of at least part of the glass melt;wherein the chlorine content of the silicon dioxide powder is greater than the chlorine content of the silicon dioxide granulate.22. The process according to claim 21 , wherein the silicon dioxide powder has a particle size distribution Din the range from 6 to 15 μm.23. The process according to claim 21 , ...

PREPARATION OF QUARTZ GLASS BODIES FROM SILICON DIOXIDE GRANULATE

The invention relates to a process for the preparation of a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate obtainable from a silicon dioxide powder, wherein the silicon dioxide granulate has a larger particle size than the silicon dioxide powder, ii.) Making a glass melt out of silicon dioxide granulate and iii.) Making a quartz glass body out of at least part of the glass melt, wherein the melting crucible has at least one inlet and at least one outlet, wherein at least part of the glass melt is removed via the melting crucible outlet. The invention further relates to a quartz glass body which is obtainable by this process. The invention further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body. 128-. (canceled)30. The process according to claim 29 , wherein the silicon dioxide granulate has a particle size distribution Din a range from 150 to 300 μm.31. The process according to claim 29 , wherein processing the silicon dioxide powder to obtain a silicon dioxide granulate comprises:providing a liquid;mixing the silicon dioxide powder with the liquid to obtain a slurry; andspray-drying the slurry.32. The process according to claim 31 , whereby the spray-drying the slurry is performed by spraying the slurry from through a nozzle into a spray tower comprising at least one of:spray granulation in a spray tower;presence of a pressure on the slurry at the nozzle in the range from 5 to 12 bar, wherein the pressure stated is absolute (relative to p=0 hPa);a temperature of the droplets as they enter the spray tower in a range from 18 to 25° C.;a temperature of the side of the nozzle facing the spray tower in a range from 350 to 430° C.;{'sup': '3', 'a throughput of slurry through the nozzle in a range from 0.25 to 0.4 m/h;'}a solids content of the slurry of at least 60 to 70 wt.-%, based on the total weight of the slurry in each case;a gas inflow into ...

GLASS FIBRES AND PRE-FORMS MADE OF HOMOGENEOUS QUARTZ GLASS

One aspect relates to a light guide comprising a jacket and one or more cores, wherein the jacket surrounds the cores. Each core has a refractive index profile perpendicular to the maximum extension of the core, wherein at least one refractive index nof each refractive index profile is greater than the refractive index nof the jacket. The jacket is made of silicon dioxide and has an OH content of less than 10 ppm, a chlorine content of less than 60 ppm, and an aluminium content of less than 200 ppb. One aspect also relates to a silicon dioxide granulate I, characterized by a chlorine content of less than 200 ppm and an aluminium content of less than 200 ppb, in each case based on the total weight of the silicon dioxide granulate I. 124-. (canceled)25. A light guide comprising:a jacket; andone or more cores;wherein the jacket surrounds the cores;{'sub': K', 'M1, 'wherein each core has a refractive index profile perpendicular to the maximum core extension, wherein at least one refractive index nof each refractive index profile is greater than the refractive index nof the jacket;'} an OH content of less than 10 ppm;', 'a chlorine content of less than 60 ppm; and', 'an aluminium content of less than 200 ppb;, 'wherein the jacket is made of silicon dioxide and compriseswherein the ppb and ppm are each based on the total weight of the jacket M1.26. The light guide according to claim 25 , comprising two or more cores claim 25 , wherein the jacket surrounds the cores as a matrix.27. The light guide according to claim 25 , wherein the jacket comprises at least one of:{'sup': 15', '3, 'an ODC content of less than 5×10/cm;'}a metal content of metals different to aluminium of less than 1 ppm;{'sub': 10', '10', '10', '10', '10', '10, 'a viscosity (p=1013 hPa) in a range from log(η(1200° C.)/dPas)=13.4 to log(η(1200° C.)/dPas)=13.9 or log(η(1300° C.)/dPas)=11.5 to log(η(1300° C.)/dPas)=12.1 or log(η(1350° C.)/dPas)=1.2 to log(η(1350° C.)/dPas)=10.8;'}a curl parameter of more than ...

Neutralizing gas system for furnace

A method of preparing an optical preform, comprises the steps of: positioning an optical preform comprising silica within a cavity of a furnace; passing an etchant gas into the furnace and at least one of through an open channel defined in the optical preform and around the optical preform; and passing a neutralizing gas into the cavity of the furnace, the neutralizing gas configured to neutralize the etchant gas.

Multicore optical fiber and optical module

The present invention relates to an MCF with a structure for enabling an alignment work with higher accuracy. The MCF has a plurality of cores and a cladding. An outer peripheral shape of the cladding in a cross section of the MCF is comprised of a circumferential portion forming a circumference coincident with an outer periphery of the MCF, and a cut portion. The cut portion has a bottom portion and two contact portions provided on both sides of the bottom portion and projecting more than the bottom portion. When a side face of the MCF is viewed, the two contact portions have flattened faces and the flattened faces of the two contact portions extend along a longitudinal direction of the MCF with the bottom portion in between.

METHOD FOR SINTERING OF OPTICAL FIBRE PREFORM

The present disclosure provides a method for sintering of an optical fibre preform. The method includes manufacturing of the optical fibre preform. In addition, the method includes drying and sintering of the optical fibre preform. In addition, drying and sintering of the optical fibre preform results into a sintered optical fibre preform. Further, the method includes preparation of a glass rod from the sintered optical fibre preform. Furthermore, the method includes insertion of the glass rod into a centreline hole of the silica soot preform. The centreline hole is created by removing mandrel from the silica soot preform. Moreover, the method includes drying and sintering of the silica soot preform. Also, drying and sintering of the silica soot results into a sintered silica soot preform. Also, the method includes drawing of a rod from the sintered silica soot preform. 1. A method for sintering of an optical fibre preform , the method comprising:manufacturing of the optical fibre preform, wherein the optical fibre preform is a porous germania doped silica soot preform;drying and sintering of the optical fibre preform, wherein drying and sintering of the optical fibre preform results into a sintered optical fibre preform;preparing a glass rod from the sintered optical fibre preform, wherein the glass rod has length in range of 800 to 1100 millimeter;inserting the glass rod into a centerline hole of a silica soot preform, wherein the centreline hole is created by removing mandrel from the silica soot preform;drying and sintering of the silica soot preform, wherein drying and sintering of the silica soot preform results into a sintered silica soot preform; anddrawing a rod from the sintered silica soot preform.2. The method as recited in claim 1 , wherein the optical fibre preform has D/d ratio in range of about 1 to 1.1 claim 1 , wherein the optical fibre preform has refractive index in range of about 2 to 5.3. The method as recited in claim 1 , wherein drying of the ...

Optical fiber having a cladding layer doped with metal nano-particles, coreless optical fiber, and method for manufacturing same

The present invention relates to an optical fiber for an SPR sensor, characterized in that the optical fiber is comprised of a core layer and a cladding layer surrounding the core layer, and the cladding layer is doped with metal nanoparticles.

PRODUCTION METHOD OF OPTICAL FIBER PREFORM, AND PRODUCTION METHOD OF OPTICAL FIBER

A production method of an optical fiber preform includes first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms, and first arranging a second cladding portion to surround the first preform. At the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles. The first preform and the burner are moved relative to each other in a longitudinal direction of the first preform. The glass particles are deposited on the first preform. 1. A production method of an optical fiber preform , the method comprising:first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms; andfirst arranging a second cladding portion to surround the first preform, whereinat the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles,the first preform and the burner are moved relative to each other in a longitudinal direction of the first preform, andthe glass particles are deposited on the first preform.2. The production method of the optical fiber preform according to claim 1 , wherein the first cladding portion is disposed so that a cross section of the first preform is close to a round shape.3. The production method of the optical fiber preform according to claim 1 , wherein the first preparing includes second arranging a center glass preform as one of the plurality of glass preforms claim 1 , third arranging an outer periphery glass preform as another one of the plurality of glass preforms on an outer periphery of the center glass preform claim 1 , and fourth arranging the first cladding portion in which a material gas and a combustion gas are ejected from a burner to produce glass particles claim 1 , the center glass preforms and the burner are moved relative to each other in a longitudinal direction of the center glass ...

OPTICAL FIBERS AND PREFORMS WITH ONE STEP FLUORINE TRENCH AND OVERCLAD AND METHODS FOR MAKING THE SAME

A method is provided that includes: forming a low-index trench region with a first density; forming an inner barrier layer comprising silica around the trench region at a second density greater than the first density; depositing silica-based soot around the first barrier layer to form an overclad region at a third density less than the second density; inserting a core cane into a trench-overclad structure; forming an outer barrier layer comprising silica in an outer portion of the overclad region at a fourth density greater than the third density; flowing a down dopant-containing gas through the trench-overclad structure to dope the trench region with the down dopant, and wherein the barrier layers mitigate diffusion of the down-dopant into the overclad region; and consolidating the trench-overclad and the core cane. 1. A method for forming an optical fiber preform , comprising:depositing silica-based soot on a bait rod to form a low-index trench region, wherein the silica-based soot is deposited such that the trench region has a first density;forming an inner barrier layer comprising silica around the trench region, wherein the inner barrier layer has a second density greater than the first density;depositing silica-based soot around the first barrier layer to form an overclad region of the optical fiber preform at a third density, wherein the second density is greater than the third density;removing the bait rod from a central channel of a trench-overclad structure that comprises the trench region, the inner barrier layer and the overclad region;inserting a core cane into the central channel of the trench-overclad structure after the step for removing the bait rod;forming an outer barrier layer comprising silica in an outer portion of the overclad region, wherein the outer barrier layer has a fourth density greater than the third density;flowing a down dopant-containing gas through the central channel of the trench-overclad structure after the step for inserting ...

Method for inserting a core rod into an outer cladding tube with spacer

Methods for producing glass components and obtainted glass component, e.g. optical fiber preform. A method includes providing a cladding tube ( 110 ) with a longitudinal axis including a first and a second bore separated by a chamfered region ( 114 ); inserting a spacer ( 120 ) into the first bore; inserting a rod ( 130 ) into the first bore ( 116 ); moving the spacer ( 120 ) into the chamfered section ( 114 ), causing the spacer ( 120 ) to rotate within the chamfered region ( 114 ); and rotating the cladding tube ( 110 ) into a vertical orientation, whereby the spacer ( 120 ) is prevented from entering the second bore ( 118 ) and supports the rod ( 130 ). Each portion of the chamfered region has a height perpendicular to the longitudinal axis greater than the height of the second bore. The spacer has a length parallel to the longitudinal axis greater than the height of the second bore but less the distance between the deepest point of the bottom of the chamfered region and an intersection of the top of the chamfered region and the first bore.

PREPARATION AND POST-TREATMENT OF A QUARTZ GLASS BODY

One aspect relates to a process for preparing a quartz glass body, including providing a silicon dioxide granulate, making a glass melt from the silicon dioxide granulate in a melting crucible, making a quartz glass body from at least a part of the glass melt, and treating the quartz glass body with at least one procedure selected from the group consisting of chemical, thermal or mechanical treatment to obtain a treated quartz glass body. One aspect also relates to a quartz glass body which is obtainable by this process. One aspect also concerns a light guide, an illuminant and a formed body each obtainable by processing the quartz glass body further. 117-. (canceled)18. A process for the preparation of a quartz glass body comprising:providing a silicon dioxide granulate,wherein the silicon dioxide granulate is prepared from pyrogenically produced silicon dioxide powder;making a glass melt from the silicon dioxide granulate in a melting crucible,wherein the melting crucible is arranged in an oven,wherein the melting crucible has at least one inlet and one outlet;making a quartz glass body from at least a part of the glass melt; andtreating the quartz glass body with at least one procedure selected from the group consisting of chemical, thermal or mechanical treatment to obtain a treated quartz glass body.19. The process according to claim 18 , wherein the silicon dioxide powder has a particle size distribution Din the range from 6 to 15 μm.20. The process according to claim 18 , wherein the quartz glass body is treated thermally and wherein the thermal treatment is at least one procedure selected from the group consisting of tempering claim 18 , compressing claim 18 , inflating claim 18 , drawing claim 18 , welding and a combination of two or more thereof.21. The process according to claim 18 , wherein the quartz glass body is treated chemically and wherein the chemical treatment comprises at least one procedure selected from the group consisting of HF acidification ...

PREPARATION OF A QUARTZ GLASS BODY IN A MELTING CRUCIBLE OF REFRACTORY METAL

The invention relates to a process for preparing a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate, ii.) Making a glass melt from the silicon dioxide granulate in a melting crucible, and iii.) Making a quartz glass body from at least a part of the glass melt, wherein the melting crucible is comprised in an oven and is made of at least one material comprising tungsten or molybdenum or a combination thereof. The invention further relates to a quartz glass body which can be obtained by this process. Further, the invention relates to a light guide, an illuminant and a formed body, each of which can be obtained by processing the quartz glass body further. 118-. (canceled)19. A process for preparing a quartz glass body comprising pyrogenic silicon dioxide , comprising: providing a pyrogenic silicon dioxide powder; and', 'processing the silicon dioxide powder to give a silicon dioxide granulate,', 'wherein the silicon dioxide granulate has a larger particle diameter than the silicon dioxide powder;, 'providing a silicon dioxide granulate comprisingmaking a glass melt from the silicon dioxide granulate; andmaking a quartz glass body from at least a part of the glass melt;wherein the melting crucible is comprised in an oven,wherein the melting crucible is made of at least one material comprising tungsten or molybdenum or a combination thereof, and an OH content of less than 500 ppm;', 'a chlorine content of less than 60 ppm;', 'a tungsten content of less than 1000 ppb;', 'a molybdenum content of less than 1000 ppb;, 'wherein the quartz glass body compriseswherein the ppb and ppm are based on the total weight of the quartz glass body in each case.20. The process according to claim 19 , wherein the oven has at least one gas inlet and one gas outlet claim 19 , wherein a gas which is removed through the gas outlet has a dew point of less than 0° C. on exiting the oven through the gas outlet.21. The process according to claim 19 , wherein ...

Method, Device, and System for Heating an Elongate Silica Cylinder in Manufacturing Optical Fibers

The invention relates to exemplary methods, devices, and systems for heating an elongate silica cylinder to form a core-rod for optical fibers. An exemplary heating device includes an elongate cavity, an elongate liner bounding the cavity, a heating element in a heating element space surrounding the liner, the liner separating the heating element space from the cavity, and a gas flushing device for effecting a flow of gas at least through the heating element space. An exemplary method includes providing the elongate silica cylinder such that it extends through the cavity, heating the cylinder locally beyond its softening temperature, and effecting a flow of argon and nitrogen gas during the heating. 1. A method for heating an elongate silica cylinder to form a core-rod for optical fibers , the method comprising: an elongate cavity extending in an axial direction of the device, arranged for allowing an elongate silica cylinder to extend through the cavity in use,', 'an elongate cylindrical liner having a cylindrical wall, the liner being made of carbon, extending in the axial direction and bounding the cavity with the cylindrical wall,', 'a heating element for heating the elongate silica cylinder in use, the heating element being provided in an annular heating element space, the heating element surrounding at least a part of the liner, the cylindrical wall of the liner separating the heating element space from the cavity, the heating element space on an outer side bounded by a further surrounding wall part of a frame portion of the device, and', 'a gas flushing device for effecting a flow of a gas at least through the heating element space;, 'providing a heating device, comprisingproviding an elongate silica cylinder such that it extends through the cavity of the heating device;heating the elongate silica cylinder locally beyond its softening temperature by means of generating heat using the heating element of the heating device; andeffecting the flow of the gas at ...

POLARIZATION-MAINTAINING OPTICAL FIBRE AND PREFORM AND METHOD FOR PRODUCING THE SAME

The invention relates to a method for producing a polarization-maintaining optical fibre, consisting of a core region and stress-generating elements embedded in the fibre body, having the following method steps: producing a core preform for the core region using internal deposition on a substrate tube, the internally coated substrate tube subsequently being collapsed, generating recesses on the core preform by virtue of the material on the outer surface of the core preform being removed parallel to the longitudinal axis of the core preform at diametrically opposed positions, filling the recesses with stress-generating rods, with the tightest possible rod packing, in a freely selectable first filling geometry, possibly filling the recesses in addition with non-stress-generating rods in a second filling geometry, sheathing the filled core preform with a jacketing tube, preparing the sheathed core preform for a fibre-drawing process, and drawing the sheathed arrangement to form in the optical fibre. A preform for producing a polarization-maintaining optical fibre contains a core preform, having a core region and a lateral region, and also contains a jacketing tube, which encloses the core preform, as well as stress-generating elements contained in the lateral region, wherein the stress-generating elements are provided in the form of recesses in the lateral region, wherein the recesses are filled with doped rods and/or undoped rods, and wherein the rod filling forms a first and/or a second arrangement geometry. 12. A method for producing a polarization-maintaining optical fiber , consisting of a core region and stress applying parts () embedded in the fiber body , comprising the following method steps:{'b': '6', 'producing recesses () in the form of circular sectors on the cross-sectional area of a core preform by removing the material on the outer surface in parallel to the longitudinal axis of the core preform at positions located diametrically opposite to one another ...

FIBER PREFORM, OPTICAL FIBER, METHODS FOR FORMING THE SAME, AND OPTICAL DEVICES HAVING THE OPTICAL FIBER

According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region having a plurality of cores, wherein two cores of the plurality of cores are bridged by an air gap, and a cladding arrangement including a first cladding region having a plurality of structures surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region having a plurality of tubes, wherein at least one split is defined in the second cladding region. According to further embodiments of the present invention, a method for forming the fiber preform, a method for forming the optical fiber, an optical coupler having the optical fiber, an optical combiner having the optical fiber, and an optical apparatus having the optical fiber are also provided. 1. A fiber preform or an optical fiber comprising:a core region comprising a plurality of cores, wherein two cores of the plurality of cores are bridged by an air gap; and a first cladding region comprising a plurality of structures surrounding the core region, and', 'a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein at least one split is defined in the second cladding region., 'a cladding arrangement comprising2. The fiber preform or the optical fiber as claimed in claim 1 , wherein the air gap is defined offset from a center of the core region.3. The fiber preform or the optical fiber as claimed in claim 1 , wherein the at least one split extends through the second cladding region entirely in a direction from the core region to the first cladding region.4. The fiber preform or the optical fiber as claimed in claim 1 , wherein the at least one split extends in a radial direction from a core of the plurality of cores to the first cladding region.5. The fiber preform or the optical fiber ...

METHOD FOR MANUFACTURING OPTICAL FIBER BASE MATERIAL AND OPTICAL FIBER BASE MATERIAL

The present invention provides a method for manufacturing an optical fiber base material and an optical fiber base material, the method including: arranging a rod containing SiOfamily glass for core, in a container; pouring a SiOglass raw material solution for cladding layer and a hardener into the container, the glass raw material solution containing a hardening resin; solidifying the glass raw material solution through a self-hardening reaction; and then drying the solidified material and heating the solidified material in chlorine gas, to manufacture an optical fiber base material in which a SiOcladding layer is formed in an outer periphery of the rod containing SiOfamily glass for core. 1. A method for manufacturing an optical fiber base material , comprising:{'sub': '2', 'arranging a rod containing SiOfamily glass for core in a center of a container;'}{'sub': '2', 'pouring a SiOglass raw material solution for cladding layer and a hardener into the container;'}solidifying the glass raw material solution through a self-hardening reaction;then removing the container from the solidified material; and{'sub': 2', '2, 'drying the solidified material and heating the solidified material in chlorine gas, to manufacture an optical fiber base material in which a SiOcladding layer is formed in an outer periphery of the rod containing SiOfamily glass for core.'}2. The method for manufacturing the optical fiber base material according to claim 1 , further comprising:{'sub': '2', 'arranging a plurality of metal rods in the container such that the metal rods surround the outer periphery of the rod containing SiOfamily glass for core placed in the container;'}{'sub': '2', 'then pouring the hardening-resin-containing SiOglass raw material solution for cladding layer and the hardener into the container; and'}{'sub': '2', 'removing the container and the metal rods from the solidified material, to form a plurality of empty holes in the SiOcladding layer.'}3. A method for ...

METHOD FOR PRODUCING OPTICAL FIBER PREFORM

The present embodiment relates to an optical fiber preform producing method for effectively suppressing breaking of symmetry of refractive index profile defined on a cross section of an optical fiber preform. In the present embodiment, when producing a center glass rod forming a part of the optical fiber preform, prior to grinding an outer peripheral portion of an intermediate glass rod in which an element-doped region is formed by collapse, an non-defective article determination regarding the intermediate glass rod to be a grinding target is performed. 1. An optical fiber preform producing method for producing an optical fiber preform which has a center glass rod that extends along a predetermined center axis and a peripheral glass portion provided on an outer peripheral surface of the center glass rod , whereina producing step of the center glass rod comprises:a glass layer forming step of producing a first intermediate glass rod by forming a glass layer including a predetermined element on an inner peripheral surface of a hollow glass rod extending along the center axis;a collapsing step of producing a second intermediate glass rod, in which an element-doped region including the predetermined element is formed along the center axis, by collapsing the first intermediate glass rod;an inspection step of selecting a non-defective article of the second intermediate glass rod by using a measurement result of concentration distribution measured on a cross section of the second intermediate glass rod perpendicular to the center axis, that is concentration distribution of the predetermined element along a long axis direction of the element-doped region; anda grinding step of producing the center glass rod by grinding an outer peripheral portion surrounding the center axis of the second intermediate glass rod selected in the inspection step along a grinding planned line defined by a predetermined radius around the center axis, andthe inspection step includes:an inspection ...

HOLLOW CORE PHOTONIC BANDGAP OPTICAL FIBRES AND METHODS OF FABRICATION

A hollow core photonic bandgap optical fibre comprises: a cladding comprising capillaries in a hexagonal array and a hollow core formed by excluding a hexagonal group of nineteen capillaries from the centre of the hexagonal array. The core is inflated. A core size ratio is 1.26 or above, defined as a ratio of the core diameter to the cladding diameter normalized to the ratio of the core diameter to the cladding diameter in an undistorted hexagonal array; a first ring ratio is between 0.55 and 2.50, defined as a ratio of the length of radially aligned struts separating the capillaries of the first ring to the length of a strut in an undistorted hexagonal array; and a core node spacing is between 0.60 and 1.90, where defined as a ratio of a strut length around the core of a largest corner capillary and a strut length around the core of a smallest side capillary. The fabrication method comprises four different pressures for the core, corner capillary, side capillary and cladding. 1. A hollow core photonic bandgap optical fibre comprising:a cladding comprising capillaries in a hexagonal array, the capillaries separated from each other by struts connected at nodes, the cladding having a cladding diameter; anda hollow core formed by excluding a hexagonal group of nineteen capillaries from the centre of the hexagonal array, the core having a core diameter; whereinthe core is bounded by a first ring of capillaries comprising corner capillaries disposed adjacent to corners of the excluded group and side capillaries positioned between the corner capillaries;and the hexagonal array has dimensions such that: 'where the core size ratio is defined as a ratio of the core diameter to the cladding diameter normalized to the ratio of the core diameter to the cladding diameter in an optical fibre formed from the same number and arrangement of capillaries in an undistorted hexagonal array;', 'a core size ratio is 1.26 or above;'} 'where the first ring ratio is defined as a ratio of the ...

A METHOD FOR MANUFACTURING A PREFORM FOR OPTICAL FIBERS

The present invention relates to a method for manufacturing a preform for optical fibers, which method comprises the sequential steps of: i) deposition of non-vitrified silica layers on the inner surface of a hollow substrate tube; ii) deposition of vitrified silica layers inside the hollow substrate tube on the inner surface of the non-vitrified silica layers deposited in step i); iii) removal of the hollow substrate tube from the vitrified silica layers deposited in step ii) and the non-vitrified silica layers deposited in step i) to obtain a deposited tube; iv) optional collapsing said deposited tube obtained in step iii) to obtain a deposited rod comprising from the periphery to the center at least one inner optical cladding and an optical core; v) preparation of an intermediate layer by the steps of: *deposition of non-vitrified silica layers on the outside surface of the deposited tube obtained in step iii) or deposited rod obtained in step iv) with a flame hydrolysis process in an outer reaction zone using glass-forming precursors, and subsequently; *drying and consolidating said non-vitrified silica layers into a vitrified fluorine-doped silica intermediate cladding layer; and *in case preceding step iv) was omitted collapsing; to C provide a solid rod comprising from the periphery to the center the intermediate layer, at least one inner optical cladding and an optical core; wherein a fluorine-comprising gas is used during the deposition and/or drying and/or consolidating and wherein the intermediate layer has a ratio between the outer diameter of the intermediate cladding layer (C) to the outer diameter of the optical core (A) that is at least 3.5; vi) deposition of natural silica on the outside surface of the intermediate cladding layer of the solid rod obtained in step v) by melting natural silica particles in an outer deposition zone to produce an outer cladding whereby a preform is obtained. 1. A method for manufacturing a preform for optical fibers , ...

LOW-LATENCY, HOLLOW-CORE OPTICAL FIBER WITH TOTAL INTERNAL REFLECTION MODE CONFINEMENT

Air core optical fiber structures in which the cladding is composed of an engineered optical metamaterial having a refractive index less than unity for at least one specific wavelength band and provides for total internal reflection of optical energy between the air core and metamaterial cladding. According to certain examples, a method of guiding optical energy includes constructing a hollow core optical fiber with an all-dielectric optical metamaterial cladding, coupling optical energy into the optical fiber having an operating wavelength near a resonance of the metamaterial cladding, and guiding the optical energy within the hollow core optical fiber by total internal reflection. 1. An optical fiber waveguide structure comprising:a cladding region of an all-dielectric optical metamaterial having subwavelength geometric features; anda hollow core region surrounded by the cladding region and configured to guide optical energy within the hollow core region by total internal reflection.2. The optical fiber waveguide structure of claim 1 , wherein the optical metamaterial has an effective refractive index less than unity at an operating wavelength of the optical fiber waveguide structure.3. The optical fiber waveguide structure of claim 2 , wherein the optical metamaterial is comprised of a regularly spaced periodic array of features embedded within a bulk material.4. The optical fiber waveguide structure of claim 3 , wherein the periodic array of features is configured in a hexagonal lattice pattern.5. The optical fiber waveguide structure of claim 3 , wherein the periodic array of features is configured in a rectangular lattice pattern.6. The optical fiber waveguide structure of claim 2 , wherein the optical metamaterial is comprised of a spatially varying array of features within a bulk material.7. The optical fiber waveguide structure of claim 6 , wherein the spatially varying array of features is quasi-periodic.8. The optical fiber waveguide structure of claim 2 ...

METHOD FOR MAKING AN OPTICAL FIBER DEVICE FROM A 3D PRINTED PREFORM BODY AND RELATED STRUCTURES

A method for making an optical fiber device may include using a three-dimensional (3D) printer to generate a preform body including an optical material. The preform body may have a 3D pattern of voids therein defining a 3D lattice. The method may further include drawing the preform body to form the optical fiber device. 132-. (canceled)33. An optical fiber preform comprising:a preform body to be drawn into a fiber optic device and comprising an optical material;the preform body comprising a plurality of helical strands having a three-dimensional (3D) pattern of voids therein defining a 3D lattice.34. The optical fiber preform of wherein the plurality of helical strands comprises a plurality of counter-rotating claim 33 , helical strands.35. The optical fiber preform of wherein the plurality of helical strands comprises a plurality of intersecting claim 33 , counter-rotating claim 33 , helical strands.36. The optical fiber preform of comprising a coating on at least a portion of the preform body comprising a different material than the optical material.37. The optical fiber preform of wherein the coating comprises an electroplated coating.38. The optical fiber preform of wherein the coating comprises gold.39. The optical fiber preform of wherein at least one of the plurality of helical strands comprises a metal.40. The optical fiber preform of wherein the metal comprises tungsten.41. The optical fiber preform of wherein the optical material comprises at least one of silicon carbide and aluminum oxide.42. The optical fiber preform of wherein the preform body has an elongate shape.43. An optical fiber preform comprising:a preform body to be drawn into a fiber optic device and comprising an optical material;the preform body comprising a plurality of strands defining a three-dimensional (3D) lattice with a 3D pattern of voids therein, and at least some of the voids opening outwardly along a side of the preform body.44. The optical fiber preform of wherein the plurality ...

SYSTEM AND METHOD FOR FABRICATING OPTICAL FIBER PREFORM AND OPTICAL FIBER

A method of manufacturing an optical fiber preform or an optical fiber is provided. The method includes the steps of: (a) providing a glass tube and a glass core rod; (b) inserting the glass core rod into the glass tube to form an assembled body; (c) heating the assembled body to cause the glass tube to collapse on and adhere to the glass core rod; and (d) treating an interface gap between the glass core rod and the glass tube during heating of at least a portion of the assembled body. Treating of the interface gap involves: (i) establishing a vacuum pressure in the interface gap, (ii) increasing a pressure of the interface gap by a treatment gas through the interface gap for a predetermined time, and (iii) re-establishing a vacuum pressure in the interface gap after the predetermined time has elapsed. 1. A method of manufacturing an optical fiber preform or an optical fiber , the method comprising the steps of:(a) providing a glass tube and a glass core rod;(b) inserting the glass core rod into the glass tube to form an assembled body;(c) heating the assembled body to cause the glass tube to collapse on and adhere to the glass core rod; and (i) establishing a vacuum pressure in the first interface gap,', '(ii) increasing a pressure of the first interface gap by flowing oxygen-enriched air through the interface gap for a predetermined time, and', '(iii) re-establishing a vacuum pressure in the first interface gap after the predetermined time has elapsed., '(d) treating a first interface gap between the glass core rod and the glass tube during heating of at least a portion of the assembled body by2. The method according to claim 1 , wherein the oxygen-enriched air comprises approximately 30% to approximately 50% oxygen.3. The method according to claim 1 , wherein the oxygen-enriched air comprises approximately 40% oxygen.4. The method according to claim 1 , wherein an entire length of the assembled body is heated zonewise claim 1 , the heating beginning at a first ...

Apparatus and Method for Applying Traction to an Elongate Element Produced by Fusing a Preform of Glass Material and Usable in a Process for Producing an Optical Fibre

Apparatus for applying traction to an elongate cylindrical element produced by fusion of an end portion of a preform of glass material, in which a traction device is capable of being connected to a portion of the elongate cylindrical element to provide traction of the elongate cylindrical element along an axis. A device for the rotation of the elongate cylindrical element applies a twist to the elongate cylindrical element about the axis simultaneously with the traction. 120.-. (canceled)21. A plant for producing an elongate cylindrical element usable for a process of producing an optical fibre , comprising:a furnace capable of housing a preform of glass material and of partially fusing an extremity of said preform:a traction apparatus comprising a traction device for providing a traction of said elongate cylindrical element from said partially fused extremity of said preform and along an axis of advance, wherein said traction device comprises at least one pair of powered traction pulleys capable of being connected to at least one portion of said elongate cylindrical element and of providing said traction, said traction pulleys being in a common plane and movable between a rest position in which the first and second pulleys are positioned away from each other and not in contact with the elongate element and an activation position in which the first and second pulleys approach each other and are in contact with the elongate element; anda rotation device capable of applying a twist to said partially fused extremity of said preform about said axis, simultaneously with said traction.22. The plant according to claim 21 , wherein said traction and twisting devices comprise at least one body capable of being connected to said portion of said elongate cylindrical element and movable both with a rectilinear motion along said axis to provide said traction and with a rotary motion about said axis to provide said twist.23. The plant according to claim 22 , wherein said traction ...

GAS FLUSHING FOR MELTING OVENS AND PROCESS FOR PREPARATION OF QUARTZ GLASS

One aspect is an oven including a melting crucible with a crucible wall, a solids feed with an outlet, a gas inlet and a gas outlet, wherein in the melting crucible the gas inlet is arranged below the solids feed outlet and the gas outlet is arranged at the same height as or above the solids feed outlet. One aspect further relates to a process for making a quartz glass body, including providing and introducing a bulk material selected from silicon dioxide granulate and quartz glass grain into the oven and providing a gas, making a glass melt from the bulk material, and making a quartz glass body from at least a part of the glass melt. One aspect relates to a quartz glass body obtainable by this process and a light guide, an illuminant and a formed body which are each obtainable by processing the quartz glass body further. 124-. (canceled)25. An oven comprising a melting crucible with a crucible wall , wherein the melting crucible comprises:a solids feed with an outlet, wherein the solids feed outlet is inside the melting crucible; anda gas inlet and a gas outlet,wherein, in the melting crucible, the gas inlet is arranged below the solids feed outlet, andwherein the gas outlet is arranged at the same height as or above the solids feed outlet.26. The oven according to claim 25 , wherein the melting crucible is heated using electrical heating elements claim 25 , in particular using a resistive or an inductive heating.27. The oven according to claim 25 , wherein there is a silicon dioxide granulate or quartz glass grain in the melting crucible.28. The oven according to claim 25 , wherein a gas inlet is arranged in the melting crucible.29. The oven according to claim 25 , wherein the gas inlet is arranged annularly in the melting crucible.30. The oven according to claim 25 , wherein the gas inlet takes the form of a distributor ring arranged in the melting crucible.31. The oven according to claim 25 , wherein the gas outlet is less distance from the crucible wall than ...

APPARATUS AND METHOD FOR PRODUCING CORE ROD OF OPTICAL FIBER

A method for producing a depressed-cladding core rod of an ultra-low water peak optical fiber, the method including 1) producing a core rod component; 2) producing an inner cladding casing component; 3) disposing the core rod hollow shaft and the casing hollow shaft respectively in the glass lathe; 4) cutting off connections among a pressure controlling pipe, a scrubber, and a vacuum pump; 5) connecting the inner cladding casing to the core rod hollow shaft hermetically; 6) turning on the glass lathe; 7) transporting a first mixture gas to the core rod hollow shaft; 8) moving a high temperature heat source; 9) transporting a second mixture gas to the core rod hollow shaft; 10) transporting the first mixture gas to the core rod hollow shaft; 11) transporting the first mixture gas under certain conditions; and 12) controlling relevant parameters to fuse the inner cladding casing with the core layer rod. 1. A method for producing depressed cladding core rod of an ultra-low water peak optical fiber , the method comprising:1) producing a core rod component: using a glass lathe to fuse and splice a core layer rod and a core rod hollow shaft together;2) producing an inner cladding casing component: using the glass lathe to fuse and splice an inner cladding casing and a casing hollow shaft together, wherein an inner diameter of the inner cladding casing is at least 0.3 mm larger than an outer diameter of the core layer rod;3) disposing the core rod hollow shaft and the casing hollow shaft respectively in two chucks of the glass lathe, wherein a distance between the inner cladding casing and the core layer rod is 0.15 to 5 mm;4) cutting off connections among a pressure controlling pipe, a scrubber, and a vacuum pump, then connecting the core rod hollow shaft to an external gas pipe via a rotary joint, and then connecting the casing hollow shaft to the scrubber;5) connecting the inner cladding casing to the core rod hollow shaft hermetically;6) turning on the glass lathe, ...

System and method for manufacturing optical fiber

A system for drawing optical fiber in microgravity including a sealed housing to prevent infiltration of at least humidity and filled with a dry environment, a preform holder located within the sealed housing to hold preform material, a furnace located within the sealed housing to receive the preform material from the preform holder and to heat the preform material from which the optical fiber is pulled, a feed system to move the preform material from the preform holder to the furnace, a drawing mechanism located within the sealed housing to pull the optical fiber from the preform material within the furnace, a diameter monitor located within the sealed housing to measure a diameter of the optical fiber and a fiber collection mechanism located. within the sealed housing to gather and store the optical fiber.

METHOD OF MANUFACTURING OPTICAL FIBER PREFORM AND OPTICAL FIBER PREFORM

The present invention relates to a method of manufacturing an optical fiber preform for obtaining an optical fiber with low transmission loss. A core preform included in the optical fiber preform comprises three or more core portions, which are each produced by a rod-in-collapse method, and in which both their alkali metal element concentration and chlorine concentration are independently controlled. In two or more manufacturing steps of the manufacturing steps for each of the three or more core portions, an alkali metal element is added. As a result, the mean alkali metal element concentration in the whole core preform is controlled to 7 atomic ppm or more and 70 atomic ppm or less. 1. A method of manufacturing an optical fiber preform which comprises a first core portion including an alkali metal element , a second core portion surrounding the first core portion , a third core portion surrounding the second core portion , and a cladding portion surrounding the third core portion and further having a refractive index lower than each refractive index of the first to third core portions , the method comprising:a first doping step of doping an alkali metal element into an inner surface of a first glass pipe with a mean chlorine concentration of 10 atomic ppm or more and 600 atomic ppm or less;a first collapse step of collapsing the first glass pipe after the first doping step by heating, thereby producing a first intermediate rod from the first glass pipe;a first diameter-reduction step comprising removing an outer peripheral portion of the first intermediate rod to produce a first core rod constituting a part of the first core portion, the first core rod having a diameter smaller than a diameter of the first intermediate rod;a second doping step of doping an alkali metal element into an inner surface of a second glass pipe with the mean chlorine concentration of 10 atomic ppm or more and 600 atomic ppm or less;a second collapse step of integrating the first core rod ...

METHOD TO PREVENT CRACKS IN OPTICAL FIBER PREFORMS

The present disclosure provides optical fiber preforms formed from core canes having large core-clad ratio, intermediate core-cladding assemblies, and methods for making the preforms and core cladding assemblies. The preforms are made with capped core canes. The capping material has a coefficient of thermal expansion less than the coefficient of thermal expansion of the core cane and more closely matched to or lower than the coefficient of thermal expansion of the surrounding cladding monolith in a cane-in-soot process. Presence of the cap reduces stresses that arise from differential thermal expansion of the core cane and cladding materials and leads to preforms having low defect concentration and low probability of failure during subsequent thermal processing steps. 1. A core-cladding assembly comprising:a porous soot cladding monolith, said porous soot cladding monolith including a first porous cladding glass layer surrounding an internal cavity, said porous soot cladding monolith comprising a first material having a first coefficient of thermal expansion;a first glass body having a portion positioned in said internal cavity, said first glass body comprising a second material having a second coefficient of thermal expansion, said second coefficient of thermal expansion differing from said first coefficient of thermal expansion; anda second glass body having a portion positioned in said internal cavity, said second glass body comprising a third material having a third coefficient of thermal expansion, said third coefficient of thermal expansion differing from said second coefficient of thermal expansion.2. The core-cladding assembly of claim 1 , wherein said first material comprises silica.3. The core-cladding assembly of claim 1 , wherein said second material comprises silica containing a dopant.4. The core-cladding assembly of claim 3 , wherein said first glass body has a core-clad ratio of at least 0.70.5. The core-cladding assembly of claim 1 , wherein said ...

METHOD OF ASSEMBLING OPTICAL FIBER PREFORMS

The present disclosure provides optical fiber preforms formed from core canes having large core-clad ratio, intermediate core-cladding assemblies, and methods for making the preforms and core cladding assemblies. The preforms are made from core canes having a contoured end surface. The contoured end surface(s) include a depression that acts to reduce the stress that develops at the junction of the end surface of the core cane with a soot cladding monolith arising from differences in the coefficient of thermal expansions of the core can and soot cladding monolith. The contoured end surface(s) leads to preforms having low defect concentration and low probability of failure during fiber draw. 1. A core-cladding assembly comprising:a porous soot cladding monolith, said porous soot cladding monolith including a first porous cladding glass layer surrounding an internal cavity, said porous soot cladding monolith having a first coefficient of thermal expansion, said internal cavity including a first entrance;a consolidated glass body positioned in said internal cavity, said consolidated glass body having a second coefficient of thermal expansion and a first end surface within said internal cavity, said first end surface facing said first entrance and including a first depression.2. The core-cladding assembly of claim 1 , wherein said consolidated glass body comprises doped silica.3. The core-cladding assembly of claim 1 , wherein said first porous cladding glass layer is in direct contact with said consolidated glass body.4. The core-cladding assembly of claim 2 , wherein said consolidated glass body has a core-clad ratio of at least 0.70.5. The core-cladding assembly of claim 1 , wherein said second coefficient of thermal expansion is greater than said first coefficient of thermal expansion.6. The core-cladding assembly of claim 1 , wherein said first depression has an ellipsoidal claim 1 , conical claim 1 , hemispherical claim 1 , annular claim 1 , cylindrical claim 1 , ...

Barbell Optical Fiber And Method Of Making The Same

High aspect ratio core optical fiber designs, which could be semi-guiding, including a core region having a first refractive index and a high aspect ratio elongated cross-section along a slow axis direction, are described. An internal cladding having a second refractive index sandwiches the core and acts as a fast-axis signal cladding. The core has an edge region at both of its short edges that is in contract with edge-cladding regions having a barbell shape. The refractive index of the core regions, the refractive index of the internal claddings, and the refractive index of the edge-cladding regions, are selected so as to maximize the optical power of a lowest-order mode propagating in the fiber core, and to minimize the optical power of the next-order modes in the fiber core. A process to fabricate such a high aspect ratio core fiber is also provided. 1. A method of making a high aspect ratio core optical fiber preform , comprising:forming a near-net rectangular shape core region of a first composition and having an elongated cross-section with a wide slow-axis dimension and a narrow fast-axis direction;forming a pair of near-net shape cladding elements having a second composition;disposing the pair of near-net shape cladding elements adjacent to each slow-axis edge of the core region to form a pair of edge-cladding regions, the combination exhibiting a barbell configuration; andsurrounding the combination of the near-net rectangular shape core region and the pair of near-net shape cladding elements with an outer cladding of a third composition.2. The method of wherein the second composition is different from the first composition.3. The method of wherein the second composition is the same as the first composition claim 1 , forming a semi-guiding high aspect ratio core optical fiber preform.4. The method of wherein at least one of the pair of near-net shape cladding elements comprises a solid rod.5. The method of wherein at least one of the pair of near-net shape ...

SPOOL-FREE FIBER OPTIC CABLE CONFIGURATION FOR CABLE INSTALLATION ONTO A POWERLINE CONDUCTOR

A method may include (1) coating a segment of fiber optic cable with an adhesive substance, (2) forming a coil of the segment of fiber optic cable, (3) deforming the coil into a noncircular shape defining a slot external to the coil while obeying a minimum bend radius requirement for the segment of fiber optic cable, and (4) activating the adhesive substance to stabilize the noncircular shape of the coil. Various other methods and apparatuses, such as those for performing the deforming operation, are also disclosed. 1. A method comprising:coating a segment of fiber optic cable with an adhesive substance;forming a coil of the segment of fiber optic cable;deforming the coil into a noncircular shape defining a slot external to the coil while obeying a minimum bend radius requirement for the segment of fiber optic cable; andactivating the adhesive substance to stabilize the noncircular shape of the coil.2. The method of claim 1 , wherein coating the segment of fiber optic cable is performed before forming the coil.3. The method of claim 1 , wherein:the adhesive substance comprises paraffin; andactivating the adhesive substance comprises heating the coil.4. The method of claim 1 , wherein the coil comprises a circular shape prior to deforming the coil.5. The method of claim 1 , further comprising pre-twisting the segment of fiber optic cable prior to forming the coil.6. The method of claim 5 , wherein pre-twisting the segment of fiber optic cable is performed at a rate that cancels a twisting to be applied to the segment of fiber optic cable during subsequent wrapping of the segment of fiber optic cable about a powerline conductor.7. The method of claim 1 , wherein deforming the coil comprises applying a first force to a first portion of a perimeter of the coil to form the slot.8. The method of claim 7 , wherein the first force is applied using a first ram with a surface having a shape of the slot.9. The method of claim 7 , wherein deforming the coil further comprises ...

MANUFACTURE OF BEND INSENSITIVE MULTIMODE OPTICAL FIBER

A method of assembling a preform for a bend-insensitive multimode optical fiber (BIMMF), includes providing a multimode core rod, a glass overclad tube, and a trench tube of down-doped quartz glass with a depressed refractive index sufficient to obtain a desired trench depth in a refractive index (RI) profile of a drawn fiber. The core rod is placed inside the trench tube, and the trench tube and the core rod are placed inside the overclad tube to define the preform. A top end of the trench tube is formed to contact an adjacent part of either the core rod or the overclad tube so that the trench tube is suspended to hang from the adjacent part when the preform is vertically oriented, and a bottom end of the trench tube is restrained from sinking into a lower portion of the preform when the preform is heated to collapse. 1. A method of assembling a preform for a bend-insensitive multimode optical fiber (BIMMF) , comprising:providing a multimode core rod;providing a glass overclad tube;providing a trench tube of down-doped quartz glass having a depressed refractive index sufficient to obtain a desired trench depth in a refractive index (RI) profile of the drawn fiber;placing the core rod inside the trench tube, and placing the trench tube and the core rod inside the overclad tube to define a preform; andforming a top end of the trench tube to contact an adjacent part of either the core rod or the over-cladding tube so that the trench tube is suspended to hang from the adjacent part when the preform is vertically oriented, and a bottom end of the trench tube is restrained from sinking into a lower portion of the preform when the preform is heated to collapse.2. The method of claim 1 , including flaring the top end of the trench tube for contacting an adjacent part of the over-cladding tube.3. The method of claim 1 , including welding a handle to a top end of the overclad tube claim 1 , and flaring the top end of the trench tube for contacting the overclad tube in the ...

LONGITUDINALLY NON-UNIFORM PREFORM AND METHOD OF MAKING THE SAME

There is provided herein a preform for drawing fibres therefrom, the preform formed of east first material and having a non-uniform structure in the longitudinal direction and a method of forming the same. 1. A preform for drawing fibres therefrom , the preform formed of at least a first material and having a non-uniform structure in the longitudinal direction.2. The preform of claim 2 , comprising a second material different to the first material and wherein the arrangement of the first material and the second material provides for the non-uniform structure of the preform in the longitudinal direction.3. The preform of either of claim 1 , wherein the preform comprises one or more hollow portions arranged in the preform such that the preform is non-uniform in the longitudinal direction.4. The preform of claim 3 , wherein one or more of the hollow portions either:are enclosed by the preform; orat least partially extend to at least one surface of the preform.5. The preform of claim 4 , wherein one or more of the hollow portions comprises a through-hole extending from a first surface of the preform to a second surface of the preform and/or one or more of the hollow portions comprises a helical channel.6. (canceled)7. The preform of claim 2 , wherein the second material is helically arranged within the first material.8. The preform of claim 1 , configured such that a fibre drawn from the preform comprises at least one steerable portion.9. The preform of claim 1 , wherein the radial width of the preform varies along the longitudinal direction.10. The preform of claim 2 , wherein (a) one of the first and second materials comprise a magnetic material claim 2 , and/or (b) the second material comprises a material having a greater flexibility than the first material.11. (canceled)12. The preform of claim 2 , wherein the preform further comprises a third material different to the first or second materials claim 2 , the arrangement of the first claim 2 , second and third ...

Systems and Methods for Producing Robust Chalcogenide Optical Fibers

In one embodiment, a chalcogenide glass optical fiber is produced by forming a billet including a chalcogenide glass mass and a polymer mass in a stacked configuration, heating the billet to a temperature below the melting point of the chalcogenide glass, extruding the billet in the ambient environment to form a preform rod having a chalcogenide glass core and a polymer jacket, and drawing the preform rod. 1. A method for producing a chalcogenide glass optical fiber , the method comprising:forming a billet including a chalcogenide glass mass and a polymer mass in a stacked configuration;heating the billet to a temperature below the melting point of the chalcogenide glass;extruding the billet in the ambient environment to form a preform rod having a chalcogenide glass core and a polymer jacket; anddrawing the preform rod.2. The method of claim 1 , wherein the chalcogenide glass mass is stacked on top of the polymer mass in the billet.3. The method of claim 2 , wherein the chalcogenide glass mass is surrounded on all sides by the polymer mass in the billet.4. The method of claim 3 , wherein the chalcogenide glass mass is positioned within a void of the polymer mass.5. The method of claim 1 , wherein the billet comprises two chalcogenide masses.6. The method of claim 5 , wherein the billet comprises a top chalcogenide mass claim 5 , a middle chalcogenide mass claim 5 , and a bottom polymer mass.7. The method of claim 1 , wherein heating the billet comprises heating the billet to a temperature of approximately 180 to 330° C.8. The method of claim 1 , wherein extruding the billet comprises extruding the billet with a force of approximately 90 to 1000 pounds.9. The method of claim 1 , wherein drawing the preform rod comprises drawing the preform rod to form an optical fiber having a chalcogenide glass core and a polymer jacket.10. The method of claim 1 , further comprising adding additional polymer material to the preform rod prior to drawing.11. A billet for use in ...

Hygroscopic additives for silica soot compacts and methods for forming optical quality glass

A method for forming an optical quality glass is provided. The method includes contacting silica soot particles with a hygroscopic additive, forming a silica soot compact, and removing the hygroscopic additive from the silica soot compact. A method of forming a cladding portion of an optical fiber preform is also provided.

Glass preform heating furnace

The present invention provides a glass preform heating furnace in which the occurrence of arching is suppressed. The glass preform heating furnace is equipped with a susceptor ( 3 ); a slit heater ( 4 ); an insulator; and a furnace body, wherein, in the case that the space between the slit heater ( 4 ) and the susceptor or between the slit heater ( 4 ) and the conductive member closest to the slit heater is D, that the maximum value of the electric field in this space is E 1, that the number of the slits in the slit heater is N, that the slit width of the slit heater is S, and that the maximum value of the electric field in the slit space is E 2, the values of D, N and S are set so that E 1≧ E 2 is established.

METHODS FOR PRODUCING A HOLLOW-CORE FIBER AND FOR PRODUCING A PREFORM FOR A HOLLOW-CORE FIBER

Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and elongating the primary preform in order to form the hollow-core fiber or further processing the primary preform in order to form a secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved in that a cladding tube is provided with an outer diameter ranging from 90 to 250 mm and a length of at least 1 m; tubular structural elements are provided, at least some of which have a wall thickness ranging from 0.2 to 2 mm and a length of at least 1 m; and the structural elements are arranged in the cladding tube inner bore while the cladding tube longitudinal axis is vertically oriented, the upper end face of each structural element being positioned at the target position. 1. Method for producing an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core , which sheath region comprises several anti-resonance elements , comprising the method steps of:{'b': 1', '6, '(a) providing a cladding tube () comprising an inner bore () of the cladding tube and ...

INCREASE IN SILICON CONTENT IN THE PREPARATION OF QUARTZ GLASS

A quartz glass body and a process for the preparation of a quartz glass body is disclosed. In one aspect, the process includes providing a silicon dioxide granulate from a pyrogenic silicon dioxide powder, making a glass melt out of the silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. In at least one process a silicon component different from silicon dioxide is added. One aspect further relates to a quartz glass body which is obtainable by this process. A light guide, an illuminant and a formed body, are each obtainable by further processing of the quartz glass body. 126-. (canceled)27. A process for the preparation of a quartz glass body comprising: providing a pyrogenic silicon dioxide powder; and', 'processing the silicon dioxide powder to obtain a silicon dioxide granulate,', 'wherein the silicon dioxide granulate has a greater particle diameter than the silicon dioxide powder;, 'providing a silicon dioxide granulate, wherein this provision comprisesmaking a glass melt out of the silicon dioxide granulate; andmaking a quartz glass body out of at least part of the glass melt;wherein in at least one of the process steps a silicon component different from silicon dioxide is added.28. The process according to claim 27 , wherein in the processing a silicon dioxide granulate with granules is formed claim 27 , wherein the granules have a spherical morphology claim 27 , wherein the processing comprises a spray granulation or a roll granulation.29. The process according to claim 27 , wherein the silicon component is silicon claim 27 , a silicon-hydrogen compound claim 27 , a silicon-oxygen compound or a silicon-hydrogen-oxygen compound.30. The process according to claim 27 , wherein the silicon component is added as powder.31. The process according to claim 27 , wherein the addition of the silicon component takes place in processing the silicon dioxide powder.32. The process according to claim 27 , wherein the silicon ...

OPTICAL FIBER PREFORMS WITH HALOGEN DOPING

Preparation of halogen-doped silica is described. The preparation includes doping silica with high halogen concentration, sintering halogen-doped silica to a closed-pore state, and subjecting the closed-pore silica body to a thermal treatment process and/or a pressure treatment process. The temperature of thermal treatment is sufficiently high to facilitate reaction of unreacted doping precursor trapped in voids or interstices of the glass structure, but is below temperatures conducive to foaming. Core canes or fibers drawn from halogen-doped silica subjected to the thermal treatment and/or pressure treatment show improved optical quality and possess fewer defects. The thermal treatment and/or pressure treatment is particularly advantageous when used for silica doped with high concentrations of halogen. 1. A method of producing halogen-doped silica comprising:doping a silica soot body with a doping precursor, the doping precursor comprising a halogen and having a partial pressure greater than 2 atm, the doping occurring at a temperature between 1000° C. and 1500° C.;densifying the doped silica soot body to form a closed-pore silica body; the closed-pore silica body comprising silica doped with the halogen; andexposing the closed-pore silica body to a gas for a time period of at least 1.0 hour, the gas having a pressure of at least 2.0 atm.2. The method of claim 1 , wherein the gas has a pressure of at least 5.0 atm.3. The method of claim 1 , wherein the gas has a pressure of at least 20.0 atm.4. The method of claim 1 , wherein the halogen comprises chlorine.5. The method of claim 4 , wherein the concentration of chlorine in the closed-pore silica body is at least 2.0 wt %.6. The method of claim 1 , wherein the halogen comprises bromine.7. The method of claim 6 , wherein the concentration of bromine in the closed-pore silica body is at least 2.0 wt %.8. The method of claim 1 , wherein the closed-pore silica body comprises unreacted doping precursor claim 1 , the ...

FIBER PREFORM, OPTICAL FIBER AND METHODS FOR FORMING THE SAME

According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region, and a cladding arrangement comprising a first cladding region comprising a plurality of rods entirely surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein a plurality of splits are defined in the second cladding region. According to further embodiments of the present invention, a method for forming a fiber preform and a method for forming an optical fiber are also provided. 1. A fiber preform or an optical fiber comprising:a core region; and a first cladding region comprising a plurality of rods entirely surrounding the core region, and', 'a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein a plurality of splits are defined in the second cladding region., 'a cladding arrangement comprising2. The fiber preform or the optical fiber as claimed in claim 1 , wherein the plurality of splits extend through the second cladding region entirely in a direction from the core region to the first cladding region.3. The fiber preform or the optical fiber as claimed in claim 2 , wherein the direction is a radial direction extending from the core region.4. The fiber preform or the optical fiber as claimed in claim 1 , wherein a respective split of the plurality of splits is defined between adjacent single tubes of the plurality of tubes.5. The fiber preform or the optical fiber as claimed in claim 1 , wherein a respective split of the plurality of splits is defined between adjacent two or more tubes of the plurality of tubes.6. The fiber preform or the optical fiber as claimed in claim 1 , wherein the plurality of tubes are arranged in a plurality of layers surrounding the core region.7. The fiber ...

Method of making optical fibers in a reducing atmosphere

A method for forming an optical fiber preform and fibers drawn from the preform. The method includes forming a soot cladding monolith, inserting a consolidated core cane into the internal cavity, and processing the resulting core-cladding assembly to form a preform. Processing may include exposing the core-cladding assembly to a drying agent and/or dopant precursor, and sintering the core-cladding assembly in the presence of a reducing agent to densify the soot cladding monolith onto the core cane to form a preform. The preform features low hydroxyl content and low sensitivity to hydrogen. Fibers drawn from the preform exhibit low attenuation losses from absorption by the broad band centered near 1380 nm.

HEATING BURNER FOR PRODUCING AN INTEGRAL BOND BETWEEN COMPONENTS OF QUARTZ GLASS

Known heating burners for producing a welded joint between components of quartz glass include a burner head in which at least one burner nozzle is formed, a burner-head cooling system for the temperature control of the burner head and a supply line connected to the burner nozzle for a fuel gas. Starting from this, to modify a heating burner in such a way that impurities in the weld seam between quartz-glass components to be connected are largely avoided, it is suggested that the burner head should include a base body of silver or of a silver-based alloy. 1. A heating burner for producing a welded joint between components of quartz glass , comprising:a burner head in which at least one burner nozzle is formed;said burner head comprises a base body of silver or of a silver-based alloy;a burner-head cooling system for the temperature control of the burner head;wherein in said burner-head cooling system two cooling water pipes for the cooling water supply and cooling water discharge are connected to each other via a fluidically continuous cooling channel; anda supply line connected to the burner nozzle for a fuel gas or a fuel gas mixture;wherein in said base body at least one burner nozzle is designed as a tubular insertion part of silver or of a silver-based alloy, that is inserted into a through hole in the base body.2. The heating burner of claim 1 , wherein the silver content of the base body of the burner head is at least 90% by wt.3. The heating burner of claim 1 , wherein the silver content of the base body of the burner head is at least 99% by wt.4. The heating burner of claim 1 , wherein a burner mouth which faces the connection surfaces is polished.5. The heating burner of claim 1 , wherein the connection between burner nozzle and gas supply line is configured as a detachable positive connection.6. A heating burner for producing a welded joint between components of quartz glass claim 1 , comprising:a burner head in which at least one burner nozzle is formed; ...

METHOD OF MANUFACTURING PREFORM FOR MULTICORE FIBER AND METHOD OF MANUFACTURING MULTICORE FIBER

A plurality of clad rods, and a clad tube, an arrangement process for arranging the plurality of core rods and the plurality of clad rods in a tube of the clad tube, in a state in which distances between center axes of the adjacent core rods become equal to each other and a state in which parts of outer circumferential surfaces in the adjacent rods contact, and an integration process for integrating the clad tube and the plurality of core rods and the plurality of clad rods arranged in the tube, wherein a ratio of a total cross-sectional area of a direction orthogonal to a length direction in the plurality of core rods and the plurality of clad rods with respect to an internal cross-sectional area of the tube of a direction orthogonal to a length direction in the clad tube is 0.84 or more. 1. A method of manufacturing a preform for a multicore fiber , comprising:a preparation process for preparing for a plurality of core rods, a plurality of clad rods, and a clad tube;an arrangement process for arranging the plurality of core rods and the plurality of clad rods in a tube of the clad tube, in a state in which distances between center axes of the adjacent core rods become equal to each other and a state in which parts of outer circumferential surfaces in the adjacent rods contact; andan integration process for integrating the clad tube and the plurality of core rods and the plurality of clad rods arranged in the tube,wherein a ratio of a total cross-sectional area of a direction orthogonal to a length direction in the plurality of core rods and the plurality of clad rods with respect to an internal cross-sectional area of the tube of a direction orthogonal to a length direction in the clad tube is 0.84 or more.2. The method of manufacturing a preform for a multicore fiber according to claim 1 ,wherein the ratio is in a range from 0.84 to 0.96, inclusive.3. The method of manufacturing a preform for a multicore fiber according to claim 1 ,{'sup': '−3', 'wherein at least ...

OPTOGENETIC PROBE

An optogenetic probe, an optogenetic system, and a method for fabricating an optogenetic probe are provided. The optogenetic probe has a proximal and a distal end, and includes an elongated body made of a body glass material and extending longitudinally between the proximal and distal ends. The optogenetic probe also includes at least one optical channel, each including an optical channel glass material having a refractive index larger than a refractive index of the body glass material, so as to guide light therealong. The optogenetic probes also includes at least one electrical channel, each including an electrical channel structure having an electrical conductivity larger than the electrical conductivity of the body glass material, so as to conduct electricity therealong. The optogenetic probe further includes at least one fluidic channel, each adapted for transporting fluid therealong. Each optical, electrical and fluidic channel extends longitudinally within the elongated body. 1. An optogenetic probe having a proximal and a distal end , the optogenetic probe comprising:an elongated body made of a body glass material having a refractive index and an electrical conductivity, the elongated body extending longitudinally between the proximal and distal ends of the optogenetic probe;at least one optical channel extending longitudinally within the elongated body and comprising an optical channel glass material having a refractive index larger than the refractive index of the body glass material, so as to guide light therealong;at least one electrical channel extending longitudinally within the elongated body and comprising an electrical channel structure having an electrical conductivity larger than the electrical conductivity of the body glass material, so as to conduct electricity therealong; andat least one fluidic channel extending longitudinally within the elongated body and adapted for transporting fluid therealong.2. The optogenetic probe according to claim 1 , ...

Method and device for forming microstructured fibre

A die and method for extruding an extrudable material to form an extruded member is described. In one embodiment, the die comprises a barrier member comprising a plurality of feed channels that extend through the barrier member. Furthermore, the die incorporates a passage forming member extending from the barrier member substantially in the direction of extrusion. The feed channels are arranged with respect to the passage forming member to allow the extrudable material to substantially flow about the passage forming member to form a corresponding passage in the extruded member.

A METHOD OF FIBER PRODUCTION

A method of producing a microstructured optical fiber is disclosed. The method includes providing a preform and drawing the preform. The preform has a center axis, a length and a first end and a second end and has at least one longitudinal hole extending lengthwise. The method includes inserting a first end of a pressure tube into the hole of the preform at the first end of the preform and subjecting the hole of the preform to a controlled pressure via the pressure tube during the drawing. 1. A method of producing a microstructured optical fiber , the method comprisingproviding a preform and drawing the preform, wherein the preform having a center axis, a length and a first end and a second end and comprises at least one longitudinal hole extending lengthwise, and wherein the method comprises inserting a first end of a pressure tube into said hole of said preform at the first end of the preform and subjecting said hole of said preform to a controlled pressure via said pressure tube during the drawing.2. The method of claim 1 , wherein the method comprises drawing the preform to the microstructured optical fiber in one or more drawing steps claim 1 , wherein at least one of the drawing steps comprises subjecting said hole of said preform to a controlled pressure via said pressure tube during the drawing.3. The method of claim 2 , wherein the drawing steps comprise a pre-drawing step claim 2 , preferably the pre-drawing step comprises subjecting said hole of said element to a controlled pressure via said pressure tube during the drawing.4. The method of or claim 2 , wherein the drawing steps comprise a final-drawing step claim 2 , preferably the final-drawing step comprises subjecting said hole of said element to a controlled pressure via said pressure tube during the drawing.5. The method of any one of the preceding claims claim 2 , wherein the at least one longitudinal hole is open at the first end of the preform for facilitating insertion of the first end of the ...

OPTICAL GLASS AND OPTICAL ELEMENT

An optical glass is provided which does not contain components negatively affecting the environment as environmental loads, and is less colored while having a refractive index maintained moderately high. The optical glass has a composition including, in % by mass, 30% or more and 47% or less of SiO, 0% or more and 10% or less of BO, 3% or more and 12% or less of NaO, 0% or more and 5% or less of LiO, 0% or more and 3.8% or less of CaO, 28% or more and 43% or less of BaO, 3% or more and 16% or less of ZnO, 0% or more and 8% or less of ZrO, 0% or more and 15% or less of LaO, where SbOis excluded from the composition, wherein the optical glass does not contain any of PbO, AsO, and KO. 1. An optical glass having a composition including , in % by mass:{'sub': '2', '30% or more and 47% or less of SiO;'}{'sub': 2', '3, '0% or more and 10% or less of BO;'}{'sub': '2', '3% or more and 12% or less of NaO;'}{'sub': '2', '0% or more and 5% or less of LiO;'}0% or more and 3.8% or less of CaO;28% or more and 43% or less of BaO;3% or more and 16% or less of ZnO;{'sub': '2', '0% or more and 8% or less of ZrO; and'}{'sub': 2', '3, '0% or more and 15% or less of LaO,'}{'sub': 2', '3, 'where SbOis excluded from the composition,'}{'sub': 2', '3', '2, 'wherein the optical glass does not contain any of PbO, AsO, and KO.'}2. The optical glass of having a refractive index (nd) of 1.58 or higher and 1.66 or lower.3. The optical glass of or having a coloration degree (λ80) of 34 or lower.4. The optical glass of having a proportion of a content of BaO in a sum of contents of MgO claim 1 , CaO claim 1 , SrO claim 1 , and BaO of 91% by mass or more.5. The optical glass of not containing any of MgO and SrO.6. The optical glass of containing SbOby 1% by mass or less exclusive to a total mass of the optical glass.7. The optical glass of used as a glass for optical fiber cores.8. An optical element comprising the optical glass of .9. The optical glass of having a coloration degree (λ80) of 34 or ...

ELECTRONIC DEVICE AND METHOD FOR MANUFACTURING THE SAME

An electronic device includes a housing, a light emitting module, a light sensor and a lens. The light emitting module is disposed inside the housing and configured to emit a light out of the housing. The light sensor is disposed inside the housing and configured to receive an environmental light from outside of the housing. The lens, coupled with the housing, includes a first transparent portion, a second transparent portion and an opaque portion. The first transparent portion allows the light to be emitted out of the housing. The second transparent portion allows the environmental light to pass through, so that the light sensor receives the environmental light. The opaque portion is disposed between the first transparent portion and the second transparent portion. The first transparent portion, the second transparent portion and the opaque portion are integrated into a whole and made of the same material. 1. An electronic device , comprising:a housing;a light emitting module disposed inside the housing and configured to emit a light out of the housing;a light sensor disposed inside the housing and configured to receive an environmental light outside the housing; and a first transparent portion through which the light passes and is emitted out of the housing;', 'a second transparent portion through which the environmental light outside the housing passes and is received by the light sensor; and', 'an opaque portion disposed between the first transparent portion and the second transparent portion, wherein the first transparent portion, the second transparent portion and the opaque portion are integrated into a whole and made of the same material., 'a lens coupled with the housing, comprising2. The electronic device of claim 1 , wherein an opening is formed on the housing claim 1 , and the lens is disposed in the opening.3. The electronic device of claim 1 , wherein an aperture is formed on the housing claim 1 , and the lens is disposed between the aperture and the ...

D1368 CR RADIATION CURABLE PRIMARY COATING FOR OPTICAL FIBER

A wet-on-dry process for coating a glass optical fiber with a radiation curable Primary Coating, comprising (a) operating a glass drawing tower to produce a glass optical fiber; (b) applying a radiation curable Primary Coating composition onto the surface of the optical fiber; (c) applying radiation to effect curing of said radiation curable Primary Coating composition; (d) applying a secondary coating to the Primary Coating; and (e) applying radiation to effect curing of said secondary coating. Also, a wet-on-wet process for coating a glass optical fiber with a radiation curable Primary Coating, comprising (a) operating a glass drawing tower to produce a glass optical fiber; (b) applying a radiation curable Primary Coating composition onto the surface of the optical fiber; (c) applying a secondary coating to the Primary Coating; and (d) applying radiation to effect curing of the Primary Coating and the secondary coating. 16.-. (canceled)8. The process of wherein said glass drawing tower is operated at a line speed of between about 750 meters/minute and about 2100 meters/minute.9. The process of wherein the radiation curable primary coating composition claim 7 , further comprises a catalyst claim 7 , wherein said catalyst is selected from the group consisting of dibutyl tin dilaurate; metal carboxylates claim 7 , including claim 7 , but not limited to: organobismuth catalysts such as bismuth neodecanoate claim 7 , CAS 34364-26-6; zinc neodecanoate claim 7 , CAS 27253-29-8; zirconium neodecanoate claim 7 , CAS 39049-04-2; and zinc 2-ethylhexanoate claim 7 , CAS 136-53-8; sulfonic acids claim 7 , including but not limited to dodecylbenzene sulfonic acid claim 7 , CAS 27176-87-0; and methane sulfonic acid claim 7 , CAS 75-75-2; amino or organo-base catalysts claim 7 , including claim 7 , but not limited to: 1 claim 7 ,2-dimethylimidazole claim 7 , CAS 1739-84-0 (very weak base); and diazabicyclo[2.2.2]octane claim 7 , CAS 280-57-9; and triphenyl phosphine; alkoxides of ...

UPWARD COLLAPSE PROCESS AND APPARATUS FOR MAKING GLASS PREFORMS

An apparatus for producing large glass preforms with minimal clad to-core waveguide distortion from a glass body having a weight, an outer surface, core rods, and a cladding surrounding and separated from the core rods by a gap. The apparatus includes collars affixed to the top and bottom of the cladding; a spacer upon which the core rods rest; a first unit holding and supporting both the bottom collar and the spacer; a second unit holding and supporting the top collar; and a frame defining a heating zone having a heating element to heat the glass body. The weight of the glass body above and below the molten glass in the heating zone is supported by the first and second units without contacting the outer surface of the glass body. 1. An apparatus for creating a glass preform from a glass body having a weight , a circumference , at least one free-standing stacked core rod , and a cladding surrounding the at least one core rod and being separated from the core rod by a gap , the apparatus comprising:a top collar affixed to the top of the cladding, the top collar having an outside diameter approximately the same as or smaller than the outside diameter of the cladding;a bottom collar affixed to the bottom of the cladding, the bottom collar having an outside diameter either smaller than or approximately the same as the outside diameter of the cladding;at least one spacer upon which the at least one core rod rests;a bottom collar holder and vacuum unit holding and supporting both the bottom collar and the at least one spacer, thereby supporting up to the entire weight of the glass body without contacting the outer surface of the glass body, the bottom collar holder and vacuum unit removing gas from or introducing gas to the apparatus;a top collar holder and vacuum unit holding and supporting the top collar, the top collar holder and vacuum unit removing gas from or introducing gas to the apparatus; anda frame defining a heating zone having a heating element to heat the ...

METHODS FOR PRODUCING A HOLLOW-CORE FIBER AND FOR PRODUCING A PREFORM FOR A HOLLOW-CORE FIBER

Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and elongating the primary preform in order to form the hollow-core fiber or further processing the primary preform in order to form a secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved in that while further processing the primary preform according to step (c), an external layer cylinder is used which has a radial viscosity profile such that the viscosity increases towards the interior of the external layer cylinder. 1. Method for producing an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core , which sheath region comprises a plurality of anti-resonance elements , comprising the method steps of:{'b': 1', '3, '(a) providing a primary preform () for a hollow-core fiber which comprises at least one cladding tube () having a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall delimited by an inner side and an outer side extends,'}{'b': '4', '(b) forming a number of precursors or preforms () ...

Preparation of quartz glass bodies from silicon dioxide powder

One aspect relates to a process for the preparation of a quartz glass body, including providing a silicon dioxide granulate, making a glass melt out of silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. The silicon dioxide granulate is obtained by providing and processing a silicon dioxide powder. One aspect also relates to silicon dioxide granulate, which is obtained by providing a silicon dioxide powder and processing it. One aspect further relates to a quartz glass body which is obtainable by this process. One aspect further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.

BURNER DESIGN FOR PARTICLE GENERATION

A method of producing bi-modal particles includes the steps of igniting a first precursor gas using a primary burner thereby producing a first plurality of particles of a first size, fluidly transporting the first plurality of particles down a particle tube, igniting a second precursor gas using a secondary burner thereby producing a second plurality of particles of a second size, flowing the second plurality of particles into the first plurality of particles, and capturing the first and second plurality of particles. 1. A burner system , comprising:a primary burner positioned within a particle tube, the primary burner configured to produce a first plurality of particles;a secondary burner positioned within a secondary tube, the secondary burner configured to produce a second plurality of particles, wherein the particle tube and the secondary tube are fluidly connected such that the first plurality of particles and the second plurality of particles are mixed; anda bag house configured to collect the first and second plurality of particles.2. The burner system of claim 1 , wherein the second plurality of particles exhibit a particle D50 diameter of less than about 10 nm.3. The burner system of claim 2 , wherein the first plurality of particles exhibit a particle D50 diameter of greater than about 25 nm.4. The burner system of claim 1 , wherein the secondary tube is positioned downstream of an elevated temperature zone of the primary burner.5. The burner system of claim 1 , wherein the secondary burner comprises a body and a precursor tube claim 1 , the body defining an annulus around the precursor tube.6. The burner system of claim 5 , wherein the secondary burner comprises one or more pilot lights. This application is a divisional and claims the benefit of priority under 35 U.S.C. § 120 of U.S. patent application Ser. No. 15/455,776, filed on Mar. 10, 2017, which claims the benefit of priority under 35 U.S.C. § 119 of U.S. Provisional Application Ser. No. 62/310,309 ...