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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 2112. Отображено 100.
18-07-2013 дата публикации

Tapered optical fiber for supercontinuum generation

Номер: US20130182999A1
Автор: Carsten L. Thomsen, Christian Jacobsen, Ole Bang, Peter Morten Moselund, Simon Toft Sorensen
Принадлежит: NKT PHOTONICS AS

The invention relates to a tapered optical fiber and a method and drawing tower for producing such an optical fiber. The tapered optical fiber comprising a core region that is capable of guiding light along a longitudinal axis of said optical fiber and a cladding region surrounding said core region. The optical fiber comprises a tapered section arranged between a first longitudinal position and a second longitudinal position, said tapered section comprising a first taper section having a first length, L 1 , over which the optical fiber is tapered down to a taper waist, and a second taper section having a second length, L 2 , over which said optical fiber is tapered up.

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Номер записи: 1
14-11-2013 дата публикации

Apparatus

Номер: US20130298501A1
Автор: Jukka Nummela, Risto Widerholm, Tatu Kutvonen
Принадлежит: Nextrom Oy

The invention relates to an apparatus. In order to achieve efficient sealing, the apparatus includes a sealing with a plurality of sealing elements arranged generally in a ring configuration around a center opening. Each sealing element includes a sealing surface facing the center opening. At least one chamber is included for receiving sections of the sealing elements. An inlet to a fluid source provides the at least one chamber with fluid in order to generate an overpressure acting on the sections of the sealing elements received in the at least one chamber, and for pressing and moving the sealing surfaces of the sealing elements towards the center opening.

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Номер записи: 2
26-12-2013 дата публикации

Graphite heating furnace

Номер: US20130340483A1
Автор: Tadashi Takahashi
Принадлежит: Furukawa Electric Co Ltd

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.

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Номер записи: 3
06-01-2022 дата публикации

METHOD AND APPARATUS FOR SUPPRESSING FLOW INSTABILITIES IN AN OPTICAL FIBER DRAW SYSTEM

Номер: US20220002182A1
Автор: Anderson Erling Richard, Hoffmann Tammy Michelle, Jewell John Michael, Kladias Nikolaos Pantelis, Moore Robert Clark
Принадлежит:

A furnace system includes a muffle defining a furnace cavity. A lower heater is coupled to the muffle and is configured to create a hot zone within the furnace cavity having a temperature of about 1900° C. or greater. An upper muffle extension is positioned above the muffle and defines a handle cavity. A downfeed handle is positioned within the handle cavity such that a gap is defined between an outer surface of the downfeed handle and an inner surface of the upper muffle extension. An upper heater is thermally coupled to the upper muffle extension and configured to heat the gap. A gas screen is positioned in the upper muffle extension and is configured to inject a process gas into the handle cavity. 1. A method of operating a furnace assembly , comprising the steps of:positioning a downfeed handle within an upper muffle extension such that a gap is defined between an outer surface of the downfeed handle and an inner surface of the upper muffle extension;heating the upper muffle extension through an upper heater thermally coupled to the upper muffle extension; andinjecting a process gas through a gas screen around the downfeed handle.2. The method of claim 1 , wherein the step of injecting a process gas further comprises:injecting at least one of nitrogen and argon through the gas screen around the downfeed handle.3. The method of claim 1 , further comprising the step of:creating a hot zone within the a furnace cavity having a temperature of about 1900° C. or greater.4. The method of claim 1 , further comprising the steps of:supporting an optical fiber preform from the downfeed handle; anddrawing an optical fiber from the optical fiber preform.5. The method of claim 1 , wherein the step of heating the upper muffle extension further comprises the step of:heating the gap to a temperature in the range of about 800° C. to about 1100° C.6. The method of claim 1 , wherein the step of positioning the downfeed handle within the upper muffle extension further comprises: ...

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Номер записи: 4
07-01-2016 дата публикации

Optical fiber drawing method and optical fiber drawing apparatus

Номер: US20160002090A1
Автор: Iwao Okazaki, Katsuyuki Tsuneishi, Takashi Yamazaki, Tatsuya Konishi
Принадлежит: Sumitomo Electric Industries Ltd

Capacity of space in a drawing furnace is decreased so as to reduce variations in pressure in the furnace and also the side of an insertion port of a glass perform is stably sealed. When drawing is started, an outer peripheral surface of the optical fiber glass preform 11 is sealed with a first seal part 17 of the seal mechanism. After a vicinity of a taper part of the optical fiber glass preform 11 starts to pass through the first seal part 17, switching to a second seal part 18 arranged above the first seal part 17 is performed, and an outer peripheral surface of a sleeve member 20 fixed so as to surround an outer periphery of the dummy rod 12 is sealed with the second seal part 18.

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Номер записи: 5
05-01-2017 дата публикации

METHOD FOR PRODUCING A SUBSTRATE TUBE OF QUARTZ GLASS

Номер: US20170001901A1
Автор: Ganz Oliver, Hain Harald
Принадлежит:

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 ...

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Номер записи: 6
02-01-2020 дата публикации

SEAL STRUCTURE FOR OPTICAL FIBER DRAWING FURNACE AND OPTICAL FIBER PRODUCTION METHOD

Номер: US20200002213A1
Автор: YOSHIKAWA Satoshi
Принадлежит: Sumitomo Electric Industries, Ltd.

A seal structure for an optical fiber drawing furnace is for plugging a gap between an upper end opening of the fiber furnace, and an optical fiber glass preform wherein a seed rod and a taper portion are present in an upper portion thereof. The seal structure comprises a first cap member engaging the seed rod of the glass preform; a second cap member covering the taper portion of the glass preform and the first cap member; a spacer member disposed between the first and second cap member, supporting the second cap member, adjusting, via a positional adjustment structure, the height position of the second cap member in the axial direction, and causing the lower extremity of the second cap member to be at a position close to the taper portion; and a seal member which seals between the upper end opening and the glass preform and/or second cap member. 1. A seal structure for an optical fiber drawing furnace for plugging a gap between an upper end opening of the optical fiber drawing furnace and an optical fiber glass preform which has a seed rod and a taper portion present in an upper portion thereof , the seal structure comprising:a first cap member which engages with the seed rod of the optical fiber glass preform;a second cap member which covers the taper portion of the optical fiber glass preform and the first cap member;a spacer member which is disposed between the first cap member and the second cap member, and supports the second cap member, adjusts a height position of the second cap member in an axial direction by a position adjustment structure, and causes a lower end of the second cap member to be positioned close to the taper portion; anda seal member which establishes a seal between the optical fiber glass preform and/or the second cap member, and the upper end opening.2. The seal structure according to claim 1 , wherein the position adjustment structure comprises support portions formed on an upper surface of the spacer member in a circumferential ...

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Номер записи: 7
08-01-2015 дата публикации

GLASS BASE MATERIAL ELONGATING METHOD

Номер: US20150007616A1
Автор: Fujii Hideki
Принадлежит:

To manufacture glass base material with high manufacturing yield, provided is a glass base material elongating method comprising forming a tapered portion where the outer diameter of the glass base material changes continuously, holding the glass base material with chucks, heating the glass base material held by chucks with a heat source, and with a portion of the glass base material softened, increasing the distance between the chucks to elongate the glass base material. The elongation begins from a state in which a position of the heat source at a position at which the outer diameter of the glass base material is set in a range from no less than 95% to no more than 98% of an average outer diameter of the trunk portion of the glass base material. 1. A glass base material elongating method comprising:holding of holding, with a pair of chucks, longitudinal ends of a glass base material that has a trunk portion and a tapered portion, which is located on one end of the trunk portion and has an outer diameter that changes along a longitudinal direction;heating of heating, with a heat source, a heated region that is a portion in the longitudinal direction of the glass base material held by the pair of chucks; andelongation of elongating the glass base material by increasing distance between the pair of chucks in the longitudinal direction of the glass base material, with a portion of the glass base material being in a softened state due to the heating by the heat source, whereinthe elongation begins from a state in which a position of the heat source indicated by a center of the heated region is at an elongation start position, which is a position in the tapered portion at which the outer diameter of the glass base material is set in a range from no less than 95% to no more than 98% of an average outer diameter of the trunk portion.2. The glass base material elongating method according to claim 1 , whereinthe holding includes fusing a dummy rod to the glass base material ...

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Номер записи: 8
12-01-2017 дата публикации

Spun round core fiber

Номер: US20170010410A1
Автор: Changgeng Ye, Joona Koponen, Ossi Kimmelma
Принадлежит: NLight Inc

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.

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Номер записи: 9
11-01-2018 дата публикации

SPUN ROUND CORE FIBER

Номер: US20180011243A1
Автор: Kimmelma Ossi, KOPONEN Joona, YE Changgeng
Принадлежит: nLIGHT, Inc.

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 ...

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Номер записи: 10
18-01-2018 дата публикации

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

Номер: US20180016180A1
Автор: Brown David
Принадлежит:

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 ...

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Номер записи: 11
18-01-2018 дата публикации

METHOD FOR PRODUCING MULTI-CORE OPTICAL FIBER

Номер: US20180016181A1
Автор: Hasegawa Takemi, TAMURA Yoshiaki
Принадлежит: Sumitomo Electric Industries, Ltd.

Provided is a method for producing a multi-core optical fiber that includes a plurality of cores made of pure silica glass and exhibits a minor transmission loss. The method for producing a multi-core optical fiber according to the present invention is a method for producing a multi-core optical fiber including a plurality of cores made of pure silica glass substantially free of Ge and a cladding surrounding the plurality of cores and made of a fluorine-containing silica glass. The multi-core optical fiber is produced by drawing an optical fiber preform at a drawing tension T satisfying the relationship 0.06 g/μm Подробнее

Номер записи: 12
24-01-2019 дата публикации

ORGANIC-INORGANIC COMPOSITE FIBERS AND METHODS THEREOF

Номер: US20190023603A1
Автор: Decker Heather Bossard, Hart Shandon Dee, Kim Jenny, Li Yanfei, McCarthy Joseph Edward, Smith Nicholas James, Zimmermann James William
Принадлежит:

An organic-inorganic composite, including: a discontinuous phase having a plurality of adjacent and similarly oriented fibers of an inorganic material; and a continuous organic phase having a thermoplastic polymer, such that the continuous organic phase surrounds the plurality of adjacent and similarly oriented fibers of the inorganic material, and the organic-inorganic composite is a plurality of adjacent and similarly oriented fibers of inorganic material contained within a similarly oriented host fiber of the thermoplastic polymer. Also disclosed are methods of making and using the composite. 2. The composite of claim 1 , wherein the inorganic material is an oxide glass having a glass transition temperature of from 200° C. to 450° C. claim 1 , and the organic phase is a thermoplastic polymer.3. The composite of claim 2 , wherein the oxide glass is zinc sulfophosphate claim 2 , and the thermoplastic polymer is selected from a polyetherimide (PEI) claim 2 , a polyethersulfone (PS) claim 2 , a polyimide claim 2 , or mixtures thereof.4. A method of making the organic-inorganic composite of claim 1 , comprising:a first melting at a suitable temperature, a batch of suitable proportions of sources or precursors comprising:15 to 20% zinc oxide;8 to 12% lithium phosphate;4 to 8% zinc pyrophosphate;12 to 16% potassium monophosphate;12 to 16% sodium hexametaphosphate;0.1 to 2% calcium carbonate;0.1 to 2% strontium carbonate;4 to 10% aluminum metaphosphate; and20 to 40% zinc sulfate heptahydrate, based on a 100 weight percent total of the inorganic portion of the composite to produce a product of the first melting; anda second melting of the product of the first melting.5. The method of claim 4 , further comprising: pouring or extruding the product of the first melt into a rod and annealing the rod at to form an annealed ZSP glass rod.6. The method of claim 4 , further comprising: extruding the annealed ZSP glass rod form an extruded and annealed ZSP glass rod.7. The method ...

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Номер записи: 13
23-01-2020 дата публикации

Viscocity-Reducing Dopants In Optical Fibers

Номер: US20200024176A1
Автор: David W. Peckham, Man F. Yan, Patrick W. Wisk
Принадлежит: OFS FITEL LLC

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.

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Номер записи: 14
29-01-2015 дата публикации

METHOD FOR PRODUCING OPTICAL FIBER

Номер: US20150027170A1
Автор: HARUNA Tetsuya, HIRANO Masaaki, TAMURA Yoshiaki
Принадлежит: Sumitomo Electric Industries, Ltd.

Provided is a method for producing an optical fiber having low attenuation and including a core that contains an alkali metal element. An optical fiber preform that includes a core part and a cladding part is drawn with a drawing apparatus to form an optical fiber , the core part having an average concentration of an alkali metal element of 5 atomic ppm or more and the cladding part containing fluorine and chlorine. The optical fiber includes a glass portion and resin coating portion and the glass portion is under residual stress that is a compressive stress of 130 MPa or less. During the drawing, the time during which an individual position of the optical fiber preform is maintained at 1500° C. or higher is 110 minutes or less. 1. A method for producing an optical fiber , comprising:drawing a silica-based optical fiber preform into an optical fiber, the optical fiber preform including a core part and a cladding part, the core part having an average concentration of an alkali metal element of 5 atomic ppm or more, the cladding part containing fluorine and chlorine, the optical fiber including a glass portion and resin coating portion, and the glass portion being under residual stress which is a compressive stress of 130 MPa or less.2. The method for producing an optical fiber according to claim 1 ,wherein in the drawing of the optical fiber preform, the time during which an individual position of the optical fiber preform is maintained at 1500° C. or higher is 110 minutes or less.3. The method for producing an optical fiber according to claim 1 ,wherein the average concentration of the alkali metal element in the core part of the optical fiber preform is 500 atomic ppm or less.4. The method for producing an optical fiber according to claim 1 ,wherein the core part of the optical fiber preform contains a halogen element, andwherein the average concentration of an additive element other than the alkali metal element or the halogen atom in the core part is equal to or ...

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Номер записи: 15
31-01-2019 дата публикации

SYSTEM AND METHOD FOR MANUFACTURING OPTICAL FIBER

Номер: US20190031550A1
Автор: Clawson Jan, Paul-Gin Noah, Pickslay Nathanael, POWERS Geoffrey, Snyder Michael, White Robert
Принадлежит:

A sensor system to provide data for use to control manufacture of an optical fiber in microgravity including a diameter sensor to monitor a diameter of a fiber drawn from a preform material, a tension sensor to monitor tension of the fiber as the fiber is pulled from the preform material to a storage device and a controller in communication with at least one of the diameter sensor and the tension sensor to evaluate sensor data to determine at least one of a speed and rate at which the fiber is pulled from the preform material. 1. A sensor system to provide data for use to control manufacture of an optical fiber in microgravity , the system comprises:a diameter sensor to monitor a diameter of a fiber drawn from a preform material;a tension sensor to monitor tension of the fiber as the fiber is pulled from the preform material to a storage device; anda controller in communication with at least one of the diameter sensor and the tension sensor to evaluate sensor data to determine at least one of a speed and rate at which the fiber is pulled from the preform material.2. The sensor system according to claim 1 , further comprising an alignment sensor to determine placement of the fiber prior to reaching the storage device and to communicate the placement data to the controller.3. The sensor system according to claim 1 , wherein the diameter sensor is located to monitor the diameter of the fiber when the fiber is first pulled from the preform material.4. The sensor system according to claim 1 , wherein the diameter sensor is located to monitor the diameter of the fiber when as the fiber exits a furnace which is used to separate the fiber from the preform material.5. The sensor system according to claim 1 , wherein the diameter sensor detects surface information about the fiber to collect data.6. The sensor system according to claim 1 , wherein the diameter sensor comprises a laser to determine at least one of concentricity and diameter of the fiber.7. The sensor system ...

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Номер записи: 16
31-01-2019 дата публикации

SYSTEM AND METHOD FOR MANUFACTURING OPTICAL FIBER

Номер: US20190031551A1
Автор: Clawson Jan, Paul-Gin Noah, Pickslay Nathanael, POWERS Geoffrey, Snyder Michael, White Robert
Принадлежит:

A system for controlling an ambient microgravity environment of a system for drawing optical fiber including a filter arranged to cleanse an environment from contaminants, a molecular sieve arranged in a series of at least one of meshes and baffles to dehumidify the environment, at least one of a pump and a fan to draw an environmental gas through the filter, through the molecular sieve and back in to an ambient environment and a housing in which the filter, molecular sieve and at least one of pump and fan reside. 1. A system for controlling an ambient microgravity environment of a system for drawing optical fiber , the system comprising:a filter arranged to cleanse an environment from contaminants;a molecular sieve arranged in a series of at least one of meshes and baffles to dehumidify the environment;at least one of a pump and a fan to draw an environmental gas through the filter, through the molecular sieve and back in to an ambient environment; anda housing in which the filter, molecular sieve and at least one of pump and fan reside.2. The system according to claim 1 , wherein the filter comprises at least one of a HEPA filter claim 1 , charcoal and a ceramic material.3. The system according to claim 1 , further comprising at least one of a baffle and tubing to increase surface area of the housing.4. The system according to claim 1 , wherein the molecular sieve dehumidifies the environment to a single parts per million range.5. The system according to claim 1 , further comprising a sensor to detect humidity in a closed environment.6. The system according to claim 5 , further comprising a controller to receive the sensed data and to operate the ECU based on the sensed data received.7. The system according to claim 1 , further comprising a heater to outgas at least one of the filter claim 1 , the molecular sieve claim 1 , at least one of the pump and the fan and an internal surface of the housing.8. The system according to claim 1 , further comprising a cooling ...

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Номер записи: 17
31-01-2019 дата публикации

SYSTEM AND METHOD FOR MANUFACTURING OPTICAL FIBER

Номер: US20190031552A1
Автор: Clawson Jan, Paul-Gin Noah, Pickslay Nathanael, POWERS Geoffrey, Snyder Michael, White Robert
Принадлежит:

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 ...

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Номер записи: 18
04-02-2021 дата публикации

Tension-based methods for forming bandwidth tuned optical fibers for bi-modal optical data transmission

Номер: US20210032153A1
Автор: Kangmei Li, Ming-Jun Li, Snigdharaj Kumar Mishra, Xin Chen
Принадлежит: Corning Inc

Methods of forming a bandwidth-tuned optical fiber for short-length data transmission systems include establishing a relationship between a change Δτ in a modal delay τ, a change ΔT in a draw tension T and a change Δλ in a BM wavelength λ of light in a BM wavelength range from 840 nm and 1100 nm for a test optical fiber drawn from a preform and that supports BM operation at the BM wavelength. The methods also include drawing from either the preform or a closely related preform the bandwidth-tuned optical fiber by setting the draw tension based on the established relationships of the aforementioned parameters so that the bandwidth-tuned optical fiber has a target bandwidth greater than 2 GHz·km at a target wavelength within the BM wavelength range.

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Номер записи: 19
04-02-2021 дата публикации

HIGH SPEED DRAW OPTICAL FIBER COATING SYSTEM AND METHOD

Номер: US20210032160A1
Автор: Bookbinder Dana Craig, Tandon Pushkar, Tandon Ruchi
Принадлежит:

An optical fiber draw system and method of coating an optical fiber. The system includes a furnace for heating an optical fiber preform, a draw assembly for drawing the optical fiber at a draw speed greater than 50 meters per second, a first coating applicator for applying a first coating onto the fiber, and a first curing assembly comprising a first plurality of light sources comprising light-emitting diodes for partially curing the first coating. The optical fiber draw system also includes a second coating applicator for applying a second coating onto the fiber on top of the first coating, and a second curing system comprising a second plurality of light sources for curing the second coating, wherein the first coating is further cured in the range of 15-50 percent after leaving the first curing assembly. 1. An optical fiber draw system comprising:a furnace for heating an optical fiber preform;a draw assembly for drawing a glass fiber from the optical fiber preform at a draw speed greater than 50 meters per second;a first coating applicator for applying a first coating composition onto the glass fiber, the first coating composition comprising a first photoinitiator, the first photoinitiator absorbing at a first wavelength;a first curing assembly comprising a first plurality of light sources comprising light-emitting diodes, the first plurality of light sources emitting at the first wavelength, the first curing assembly configured to cure the first coating composition to a first degree of cure with the emission at the first wavelength;a second coating applicator for applying a second coating composition onto the first coating composition having the first degree of cure, the second coating composition comprising a second photoinitiator, the second photoinitiator absorbing at a second wavelength; anda second curing assembly comprising a second plurality of light sources, the second plurality of light sources emitting at the second wavelength, the second curing ...

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Номер записи: 20
12-02-2015 дата публикации

METHODS OF MAKING OPTICAL FIBER WITH REDUCED HYDROGEN SENSITIVITY THAT INCLUDE FIBER REDIRECTION

Номер: US20150040614A1
Автор: Dunwoody Steven Akin, Moore Robert Clark, Tandon Pushkar
Принадлежит:

A method of making optical fibers that includes controlled cooling to produce fibers having a low concentration of non-bridging oxygen defects and low sensitivity to hydrogen. The method may include heating a fiber preform above its softening point, drawing a fiber from the heated preform and passing the fiber through two treatment stages. The fiber may enter the first treatment stage at a temperature between 1500° C. and 1700° C., may exit the first treatment stage at a temperature between 1200° C. and 1400° C., and may experience a cooling rate less than 5000° C./s in the first treatment stage. The fiber may enter the second treatment stage downstream from the first treatment stage at a temperature between 1200° C. and 1400° C., may exit the second treatment stage at a temperature between 1000° C. and 1150° C., and may experience a cooling rate between 5000° C./s and 12,000° C./s in the second treatment stage. The method may also include redirecting the fiber with a fluid bearing device or an air-turn device. 1. A method of processing an optical fiber comprising:providing a fiber along a first pathway;cooling said fiber in a first treatment region along said first pathway, said fiber entering said first treatment region at a first average temperature and exiting said first treatment region at a second average temperature, said second average temperature being in the range from 1000° C. to 1500° C., said cooling from said first average temperature to said second average temperature occurring at a first cooling rate;cooling said fiber in a second treatment region along said first pathway, said fiber entering said second treatment region at a third average temperature and exiting said second treatment region at a fourth average temperature, said fourth average temperature being in the range from 800° C. to 1200° C., said cooling from said third average temperature to said fourth average temperature occurring at a second cooling rate; andredirecting said fiber from ...

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Номер записи: 21
16-02-2017 дата публикации

Optical fiber and method of manufacturing optical fiber

Номер: US20170045681A1
Автор: Nobuo Kuwaki, Ryo Maruyama
Принадлежит: Fujikura Ltd

An optical fiber which allows propagation of two or more modes, and in a case where a mode coupling coefficient between at least two modes among the two or more modes is h [1/km], the length of the optical fiber is z [km], and the amount XT of coupling between the two modes is represented by XT=10·log 10 (zh) [dB], the amount XT of coupling satisfies Expression (A) described below. XT ≧+14 [dB]  (A)

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Номер записи: 22
14-02-2019 дата публикации

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

Номер: US20190047896A1
Автор: COREY CHRISTOPHER A., Lee Susanne M.
Принадлежит:

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 ...

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Номер записи: 23
25-02-2021 дата публикации

Apparatus and Process for Producing Fiber from Igneous Rock

Номер: US20210053856A1
Автор: Biland Oleksandr, Ferguson, SR. Robert Bruce
Принадлежит:

Methods and apparatus for producing fibers from igneous rock, including basalt include heating igneous rock by electrical conductive coils to achieve an homogenous melt and forming homogenous fibers from the melt. 1. A method of producing fibers from igneous rock , said method comprising:adding a volume of crushed igneous rock to a furnace chamber, wherein the furnace chamber is at least partially surrounded in a first electrical induction coil;applying alternating current to the first induction coil, effective to heat the volume of crushed igneous rock added to the furnace chamber and to produce a homogenous rock melt in at least a portion of the volume of igneous rock; andpassing at least a part of the homogenous rock melt portion through a fiber forming chamber and subsequently passing at least a portion of the volume of igneous rock from the fiber forming chamber through fiber forming orifices under controlled temperature effective to produce fibers, wherein the fiber forming chamber is at least partially surrounded by a second electrical induction coil and the temperature of the homogenous rock melt portion in the fiber forming chamber is controlled at least in part by the power and frequency of electrical current in the second induction coil.2. The method of claim 1 , wherein the controlled temperature at the fiber forming orifices is controlled to within 20° C. to 70° C. of a target temperature.3. The method of claim 1 , wherein the controlled temperature at the fiber forming orifices is controlled to within 30° C. to 60° C. of a target temperature.4. The method of claim 1 , further comprising passing at least a portion of said homogenous rock melt portion through a conditioning chamber at least partially surrounded by in a third electrical induction coil and cooling the homogenous rock melt portion effective to produce a laminar flow in at least a portion of the conditioning chamber prior to passing the homogenous rock melt portion into the fiber forming ...

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Номер записи: 24
21-02-2019 дата публикации

Fluid bearings having a fiber support channel for supporting an optical fiber during an optical fiber draw process

Номер: US20190055153A1
Автор: Bruce Warren Reding, Robert Clark Moore
Принадлежит: Corning Inc

A fluid bearing for directing optical fibers during manufacturing is presented. The fluid bearing provides a flow of fluid to levitate and direct an optical fiber along a process pathway. The optical fiber is situated in a fiber slot and subjected to an upward force from fluid flowing from an inner radial position of the fiber slot past the optical fiber to an outer radial position of the fiber slot. The levitating force of fluid acting on the optical fiber is described by a convex force curve, according to which the upward levitating force on the optical fiber increases as the optical fiber moves deeper in the slot. Better stability in the positioning of the optical fiber in the fiber slot is achieved and contact of the optical fiber with solid surfaces of the fluid bearing is avoided. Various fluid bearing structures for achieving a convex force curve are described.

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Номер записи: 25
02-03-2017 дата публикации

Optical fiber manufacturing method

Номер: US20170057867A1
Автор: Masaaki Hirano, Tetsuya Haruna, Tetsuya Nakanishi, Yoshiaki Tamura
Принадлежит: Sumitomo Electric Industries Ltd

There is provided a method for producing a low-loss alkali metal-doped silica core optical fiber having excellent hydrogen resistance. The method for producing the optical fiber according to the present invention includes a drawing step of drawing an optical fiber preform in a drawing furnace to produce a silica glass-based optical fiber including a core region containing an alkali metal with an average concentration of 0.5 atomic ppm or more and a cladding region that surrounds the core region and a heating step of heating the optical fiber in a heating furnace through which the optical fiber drawn from the drawing furnace passes.

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Номер записи: 26
12-03-2015 дата публикации

OPTICAL FIBER DRAWING APPARATUS HAVING SIMPLE STRUCTURE AND OPTICAL FIBER DRAWING METHOD USING THE SAME

Номер: US20150068252A1
Автор: Ahn Joon Tae, CHOI Hee Rak, PARK Bong Je, SEO Hong-Seok
Принадлежит: Electronics and Telecommunications Research Institute

Provided is an optical fiber drawing apparatus and optical fiber drawing method using the same. The apparatus may include a crucible accommodating core and clad sources and having a bottom hole through which the core and clad sources pass, and a plug disposed under the crucible, the plug passing through the bottom hole. The plug may include a bottom plug disposed under the crucible to close the bottom hole, and a first upper plug disposed on the bottom plug to pass through the bottom hole. 1. An optical fiber drawing apparatus comprising:a crucible accommodating core and clad sources and having a bottom hole through which the core and clad sources pass; anda plug disposed under the crucible, the plug passing through the bottom hole,wherein the plug comprises:a bottom plug disposed under the crucible to close the bottom hole; anda first upper plug disposed on the bottom plug to pass through the bottom hole.2. The optical fiber drawing apparatus of claim 1 , further comprising a second upper plug disposed on the first upper plug claim 1 , the second upper plug passing through the clad source to extend up to the core source.3. The optical fiber drawing apparatus of claim 1 , further comprising a plate having a first upper hole aligned with the bottom hole.4. The optical fiber drawing apparatus of claim 3 , wherein the plate comprises a metal or glass.5. The optical fiber drawing apparatus of claim 1 , further comprising a third upper plug disposed on the first upper plug claim 1 , the third upper plug extending in the first upper hole.6. The optical fiber drawing apparatus of claim 1 , further comprising a partition wall protruding from a sidewall within the crucible and having a second upper hole aligned with the bottom hole.7. The optical fiber drawing apparatus of claim 6 , wherein the crucible comprises:a lower crucible having the bottom hole; andan upper crucible extending on the lower crucible,wherein the lower crucible stores the clad source, and the upper ...

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Номер записи: 27
16-03-2017 дата публикации

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

Номер: US20170075147A1
Автор: Brehm Lothar, Gutsche Thomas, Hämmerle Wolfgang, Hanf Robert
Принадлежит:

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 ...

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Номер записи: 28
31-03-2022 дата публикации

METHODS AND SYSTEMS FOR PROCESSING OPTICAL FIBER

Номер: US20220098085A1
Автор: Akarapu Ravindra Kumar, Carberry Joel Patrick, Deneka David Alan, Dunwoody Steven Akin, Hrdina Kenneth Edward, Jewell John Michael, Jiang Yuanjie, Kladias Nikolaos Pantelis, Li Ming-Jun, Nayak Barada Kanta, Powers Dale Robert, Tagliamonti Vincent Matteo, Thomas Christopher Scott, Zhou Chunfeng
Принадлежит:

In some embodiments, a method for processing an optical fiber includes: drawing an optical fiber through a draw furnace, conveying the optical fiber through a flame reheating device downstream from the draw furnace, wherein the flame reheating device comprises one or more burners each comprising: a body having a top surface and an opposing bottom surface, an opening within the body extending from the top surface through the body to the bottom surface, wherein the optical fiber passes through the opening, and one or more gas outlets within the body; and igniting a flammable gas provided by the one or more gas outlets to form a flame encircling the optical fiber passing through the opening, wherein the flame heats the optical fiber by at least 100 degrees Celsius at a heating rate exceeding 10,000 degrees Celsius/second. 1. A system for processing optical fiber , comprising:a draw furnace containing an optical fiber preform;a fiber conveyance pathway extending between an upstream end of the draw furnace and a downstream end opposite the upstream end, wherein an optical fiber drawn from the optical fiber preform is conveyed along the fiber conveyance pathway from the upstream end to the downstream end in a fiber conveyance direction; and{'claim-text': ['a body having a top surface and an opposing bottom surface,', 'an opening within the body extending from the top surface through the body to the bottom surface, wherein the opening is configured to pass the optical fiber through the body along the fiber conveyance pathway, and', 'one or more gas outlets within the body configured to ignite a flammable gas to form a flame encircling the optical fiber within the opening.'], '#text': 'a flame reheating device surrounding the fiber conveyance pathway downstream from the draw furnace, wherein the flame reheating device is configured to heat the optical fiber by at least 100 degrees Celsius at a heating rate greater than 10,000 degrees Celsius/second, wherein the flame ...

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Номер записи: 29
12-03-2020 дата публикации

Technique For Fabricating A Multistructure Core Rod Used In Formation Of Hollow Core Optical Fibers

Номер: US20200079680A1
Автор: Corrado Matt, DiGiovanni David J, Kremp Tristan, Mangan Brian, Puc Gabriel, Windeler Robert S
Принадлежит: OFS FITEL, LLC

A process of fabricating the microstructure core rod preform used in the fabrication of a hollow core optical fiber includes the step of applying external pressure to selected hollow regions during the drawing of the preform from the initial assembly of capillary tubes. The application of pressure assists the selected hollow regions in maintaining their shape as much as possible during draw, and reduces distortions in the microstructure cells in close proximity to the core by controlling glass distribution during MCR draw. 1. A method for fabricating a microstructure core rod comprising the steps ofarranging a plurality of capillary tubes in a matrix of a preform assembly;drawing the preform assembly into the microstructure core rod by heating and collapsing the plurality of capillary tubes to fuse together, wherein during the drawing step, performing the step ofapplying an external pressure to one or more selected hollow regions in the preform assembly sufficient to control glass distribution among the fusing capillary tubes.2. The method as defined in wherein the preform assembly is arranged as a photonic bandgap assembly byremoving a plurality of centrally-located capillary tubes to define a hollow core region of a predetermined size, defined as an N-pitch cladding diameter, where N is the number of capillary tubes removed across a central axis of the assembly; andinserting a core tube within the hollow core region.3. The method as defined in wherein the external pressure is applied to a hollow core region and controlled to create a core size of a predetermined ratio of final diameter to original N-pitch cladding diameter.4. The method as defined in wherein the selected hollow regions comprise a set of cells surrounding and contacting the hollow core region claim 2 , each cell defined by a pair of nodes contacting the core tube and a strut extending between the pair of nodes.5. The method as defined in wherein the external pressure is applied to the hollow core ...

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Номер записи: 30
19-03-2020 дата публикации

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

Номер: US20200087194A1
Автор: COREY CHRISTOPHER A., Lee Susanne M.
Принадлежит:

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 ...

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Номер записи: 31
19-03-2020 дата публикации

DRAW TOWER GRATING PRODUCTION METHOD AND SYSTEM

Номер: US20200088936A1
Автор: BARTELT Hartmut, LINDNER Eric, ROTHHARDT Manfred, VAN HOE Bram, VLEKKEN Johan, VOIGTLÄNDER Christian
Принадлежит:

A system for producing an optical fiber with inscribed grating array is described. The system comprises a fiber drawing apparatus for drawing an optical fiber, a writing system for inscribing a grating in the optical fiber during the drawing process of the optical fiber and a controller for controlling the driving of the writing system. According to the present invention the fiber drawing apparatus also comprises a fiber length and/or drawing detecting means for determining the fiber length and/or fiber drawing speed and/or a fiber drawing parameter during the drawing process. The controller thereby is configured for capturing information from the fiber length and/or drawing detecting means and for controlling the writing system based on the captured information captured from the fiber length and/or drawing detecting means. 119.-. (canceled)20. A system for producing an optical fiber with inscribed grating , the system comprising:a fiber drawing apparatus arranged for drawing an optical fiber,a writing system comprising:a coherent radiation source anda radiation modulating means, configured for inscribing a grating in the optical fiber during the drawing process of the optical fiber,a controller configured for controlling the driving of the writing system,wherein the fiber drawing apparatus comprises a fiber length and/or drawing detecting means for determining the fiber length and/or fiber drawing speed and/or a fiber drawing parameter during the drawing process, andthe controller being configured for capturing information from the fiber length and/or drawing detecting means and for controlling the writing system based on the captured information captured from the fiber length and/or drawing detecting means.21. The system according to claim 20 , wherein the fiber length and/or drawing detecting means comprises a rotating means for guiding the drawn fiber in a non-slipping mode.22. The system according to claim 21 , wherein the fiber length and/or drawing detecting ...

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Номер записи: 32
01-04-2021 дата публикации

Furnace gas feeding device, optical fiber production device, and optical fiber production method

Номер: US20210094867A1
Автор: Katsuyuki Tsuneishi, Satoshi Yoshikawa
Принадлежит: Sumitomo Electric Industries Ltd

A furnace gas supply apparatus configured to supply gas into a drawing furnace, includes: a first flow channel introducing the gas from a predetermined first gas inlet to flow the gas from a predetermined first gas outlet toward a gas storage portion, and a second flow channel introducing the gas stored in the gas storage portion from a predetermined second gas inlet to flow the gas from a predetermined second gas outlet toward a furnace core tube of the drawing furnace, in which the gas storage portion is provided between the first gas outlet and the second gas inlet, and in which an opening position of the second gas inlet is provided at a position different from an opening position of the first gas outlet.

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Номер записи: 33
05-04-2018 дата публикации

OPTICAL FIBER WITH LOW FICTIVE TEMPERATURE

Номер: US20180093915A1
Автор: Dunwoody Steven Akin, Moore Robert Clark, Tandon Pushkar
Принадлежит:

Optical fibers having low fictive temperature and methods of making such fibers are described. Management of the cooling rate of an optical fiber during fiber draw permits control over the fictive temperature of the fiber. Non-monotonic cooling rates are shown to promote reductions in fiber fictive temperature. The non-monotonic cooling includes slower cooling rates in upstream portions of the process pathway and faster cooling rates in downstream portions of the process pathway. Reduction in fiber fictive temperature is achieved by controlling the ambient temperature of the fiber to slow the cooling rate of the fiber in upstream portions of the process pathway that correspond to the fiber temperature regime in which the fiber viscosity is sufficiently low to permit efficient structural relaxation. Increases in cooling rate in downstream portions of the process pathway permit adjustment of fiber temperature as needed to meet entrance temperature requirements of downstream processing units. Lower fiber fictive temperature and lower fiber attenuation are achieved at faster draw speeds through non-monotonic cooling of fiber temperature. 1. A method of processing an optical fiber comprising:cooling an optical fiber from a first fiber temperature to a second fiber temperature at a first cooling rate, said first cooling rate being less than 5000° C./s;cooling said optical fiber from a third fiber temperature to a fourth fiber temperature at a second cooling rate, said third fiber temperature being less than or equal to said second fiber temperature, said second cooling rate being greater than said first cooling rate and less than 5000° C./s.2. The method of claim 1 , wherein said first fiber temperature is in the range from 1600° C.-1800° C. and said second fiber temperature is in the range from 1400° C.-1550° C.3. The method of claim 2 , wherein said third fiber temperature is in the range from 1400° C.-1550° C. and said fourth fiber temperature is in the range from 1250 ...

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Номер записи: 34
28-03-2019 дата публикации

OPTICAL FIBER WITH LOW FICTIVE TEMPERATURE

Номер: US20190092678A1
Автор: Bookbinder Dana Craig, Li Ming-Jun, Reding Bruce Warren, Tandon Pushkar
Принадлежит:

An optical fiber with low fictive temperature along with a system and method for making the optical fiber are provided. The system includes a reheating stage that heats the fiber along the process pathway to a temperature sufficient to lower the fictive temperature of the fiber by relaxing the glass structure and/or driving the glass toward a more nearly equilibrium state. The fiber is drawn from a preform, conveyed along a process pathway, cooled and subsequently reheated to increase the time of exposure of the fiber to temperatures conducive to lowering the fictive temperature of the fiber. The process pathway may include multiple reheating stages as well as one or more fiber-turning devices. 1. A method of processing an optical fiber comprising:drawing an optical fiber from a preform;conveying said optical fiber along a process pathway;heating said optical fiber from a first temperature to a second temperature along said process pathway; andcooling said optical fiber from said second temperature to a third temperature along said process pathway, said cooling including exposing said optical fiber to a process temperature in the range from 1000° C. to 1700° C. for longer than 0.2 sec.2. The method of claim 1 , wherein said first temperature is less than 1000° C.3. The method of claim 2 , wherein said second temperature is greater than 1100° C.4. The method of claim 2 , wherein said third temperature is less than 1000° C.5. The method of claim 1 , wherein said first temperature is less than 1000° C. and said second temperature is greater than 1000° C.6. The method of claim 1 , wherein said first temperature is less than 1300° C. and said second temperature is greater than 1300° C.7. The method of claim 1 , wherein said cooling includes exposing said optical fiber to a process temperature in the range from 1000° C. to 1700° C. for longer than 1.0 sec.8. The method of claim 1 , wherein said cooling includes exposing said optical fiber to a process temperature in the ...

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Номер записи: 35
16-04-2015 дата публикации

OPTICAL FIBER COOLING APPARATUS AND OPTICAL FIBER MANUFACTURING METHOD

Номер: US20150101368A1
Автор: ENOMOTO Tadashi, OKAZAKI Iwao, Shiozaki Manabu, UENOYAMA Norihiro
Принадлежит:

When a lower gauge pressure of a cooling tube part is set at A, and the number of divided units of the cooling tube part is set at N, and a length of each of the divided units of the cooling tube part is set at Li (i=1 to N), and a radius of each of the divided units of the cooling tube part is set at Ri (i=1 to N), and a gas flow rate of a coolant gas passed through each of the divided units of the cooling tube part is set at Qi (i=1 to N), and a viscosity coefficient of a coolant gas is set at μ1, and a radius of an optical fiber is set at r1, and a drawing speed of the optical fiber is set at V1, and a pressure loss of a straight tube part is set at B, and the number of divided units of the straight tube part is set at n, and a length of each of the divided units of the straight tube part is set at LLj (j=1 to n), and a radius of each of the divided units of the straight tube part is set at RRj (j=1 to n), and a gas flow rate of a pressurized gas passed through the straight tube part is set at Q, and a viscosity coefficient of the pressurized gas is set at μ2, and a pressure loss of a pressurizing chamber is set at C, and internal pressure correlation constants of the pressurizing chamber are set at D1 to D5, and a shape correction coefficient of the pressurizing chamber is set at k (1≦k≦2), an optical fiber cooling apparatus satisfies the following formula. 2. The optical fiber cooling apparatus as claimed in claim 1 , wherein a sum of lengths LLj of each of the divided units of the straight tube part is values from 0.001 to 0.5 m (both inclusive).4. The optical fiber manufacturing method as claimed in claim 3 , wherein the pressurized gas includes any of gases of air claim 3 , nitrogen claim 3 , argon and carbon dioxide.5. The optical fiber manufacturing method as claimed in claim 3 , wherein a gas flow rate Qof the pressurized gas is 0.0015 m/s or less. The present application claims priorities from Japanese Patent Application No. 2013-212776 filed on Oct. 10, ...

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Номер записи: 36
26-03-2020 дата публикации

System and method for manufacturing optical fiber

Номер: US20200095157A1
Автор: Geoffrey York Powers, Jan Clawson, Michael Snyder, Nate Pickslay, Noah Paul-Gin, Robert White
Принадлежит: Made In Space Inc

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.

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Номер записи: 37
26-03-2020 дата публикации

OPTICAL FIBER PRODUCTION METHOD

Номер: US20200095158A1
Автор: IMASE Akihito, KITAMURA Takayuki
Принадлежит: FUJIKURA LTD.

An optical fiber production method includes: drawing an optical fiber preform in a drawing furnace; and cooling the optical fiber. The optical fiber is passed through a plurality of annealing furnaces while the optical fiber is cooled. While the optical fiber is cooled, temperatures of the annealing furnaces are set such that the temperature difference is within a range between and including an upper limit and a lower limit of a temperature difference between a temperature of the optical fiber and a fictive temperature of glass constituting a core of the optical fiber at which an increase of a transmission loss of the optical fiber when the fictive temperature of the glass is decreased is less than 0.001 dB/km. 3. The optical fiber production method according to claim 2 , wherein Equation (2) is held while the optical fiber is cooled.{'br': None, 'i': T', '−T', 'T', '−T', 't', 'T, 'sub': f', 'f, 'sup': '0', '40° C.<=()exp(−Δ/τ())<60° C.\u2003\u2003(2)'}5. The optical fiber production method according to claim 4 , wherein Equation (4) is held.{'br': None, 'i': T', '−T, 'sub': en', 'sn, '40° C.<<60° C.\u2003\u2003(4)'}6. The optical fiber production method according to claim 1 , wherein a temperature difference between a preset temperature and a fictive temperature of the glass at an outlet port of an annealing furnace among the annealing furnaces is smaller in an annealing furnace claim 1 , among the annealing furnaces claim 1 , disposed on a downstream side than in an annealing furnace claim 1 , among the annealing furnaces claim 1 , disposed on an upstream side.7. The optical fiber production method according to claim 1 , wherein the optical fiber is in any one of the plurality of annealing furnaces during at least certain period for which a temperature of the optical fiber is greater than or equal to 1 claim 1 ,300° C. and less than or equal to 1 claim 1 ,500° C. The present invention relates to an optical fiber production method.In optical fiber communication ...

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Номер записи: 38
12-04-2018 дата публикации

CONTROL DEVICE AND MANUFACTURING APPARATUS OF OPTICAL FIBER

Номер: US20180099893A1
Автор: OKADA Kenji
Принадлежит: FUJIKURA LTD.

A control device which is used in a manufacturing apparatus of an optical fiber, the manufacturing apparatus including a drawing unit and a coating unit. The control device includes: one or a plurality of non-contact holding portions which hold the bare optical fiber at any position between the drawing unit and the coating unit; a position detection unit; and a control unit which controls a flow rate of a fluid introduced into the non-contact holding portion on the basis of the floating position detected by the position detection unit. The non-contact holding portion comprises a guide groove. The control unit detects the floating position of the bare optical fiber at at least one of the non-contact holding portions, compares the detected floating position with a predetermined reference floating position, and controls a flow rate of the fluid introduced into the non-contact holding portions. 1. A control device which is used in a manufacturing apparatus of an optical fiber , a drawing unit which draws an optical fiber preform and forms a bare optical fiber; and', 'a coating unit which coats an outer circumference of the bare optical fiber with a coating layer comprising a resin,, 'the manufacturing apparatus comprising one or a plurality of non-contact holding portions which hold the bare optical fiber at any position between the drawing unit and the coating unit;', 'a position detection unit which detects a floating position of the bare optical fiber in the non-contact holding portion; and', 'a control unit which controls a flow rate of a fluid introduced into the non-contact holding portion on the basis of the floating position detected by the position detection unit,, 'the control device comprisingwherein the non-contact holding portion comprises a guide groove which guides the bare optical fiber and an internal space portion into which the fluid is introduced from the outside,wherein in the guide groove, an outlet through which the fluid in the internal space ...

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Номер записи: 39
13-04-2017 дата публикации

Gas reclamation system for optical fiber production

Номер: US20170101336A1
Автор: Chunfeng Zhou, John Michael Jewell, Kochuparambil Deenamma Vargheese, Nikolaos Pantelis Kladias, Stephen Mitchell Carlton
Принадлежит: Corning Inc

A method of producing an optical fiber is provided that includes the steps of flowing a first gas into an optical fiber draw furnace. The first gas is passed through a heated section configured to contain and heat a glass source from which the optical fiber is drawn, passing the first gas through a muffle which defines a capture chamber. A portion of the first gas is removed through at least one reclaim port operatively coupled to the capture chamber. A second gas flows into a gas screen at a rate configured to substantially recover a pressure drop associated with removing the portion of the first gas.

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Номер записи: 40
04-04-2019 дата публикации

OPTICAL FIBER, AND SYSTEM AND METHOD FOR MANUFACTURING OPTICAL FIBER

Номер: US20190101693A1
Автор: CAO SHAN-SHAN, HU JI-GANG, LIU ZHI-ZHONG, SHEN Yi-Chun, SU HAI-YAN, Wang Zhen, XU HAI-TAO, Zhang Hai-Tao, ZHU XIAO-XING
Принадлежит:

An optical fiber comprises, from a center to a periphery, a fiber core of undoped silica; a cladding layer; and a coating of polyacrylate, wherein the fiber core has a radius of 5 to 7 μm and an ellipticity of less than 1.5%, the cladding layer with an ellipticity of less than 0.4% comprises inner, intermediate, and outer cladding layers, the inner cladding layer being doped with fluorine of 5 to 12 μm thickness, and refractive index difference to fiber core of −0.4 to −0.2%, the outer cladding layer being undoped quartz of 25 to 45 μm thickness, and the coating comprises an inner coating of 25 to 40 μm thickness, and an outer coating of 25 to 35 μm thickness and an ellipticity of less than 2%. The optical fiber has high durability and large effective transmission area, a method and system for preparing such optical fiber are also disclosed. 1. An optical fiber comprises , from a center to a periphery of the optical fiber , a fiber core; a cladding layer; and a coating , whereinthe fiber core is an undoped silica glass, with a radius of 5 μm to 7 μm, ellipticity of the fiber core being less than 1.5%,the cladding layer comprises an inner cladding layer, an intermediate cladding layer, and an outer cladding layer, the inner cladding layer being doped with fluorine, having, a thickness of 5 μm to 12 μm, a relative refractive index difference between the inner cladding layer and the fiber core being −0.4% to −0.2%,the intermediate cladding layer having a thickness of 12 μm to 25 μm, the outer cladding layer being a pure quartz glass layer with a thickness of 25 μm to 45 μm, and an overall ellipticity of the cladding layer being less than 0.4%, andthe coating is made of polyacrylate, and comprises an inner coating and an outer coating the inner coating having, a thickness of 25 μm to 40 μm, and the outer coating having a thickness of 25 μm to 35 μm, and an ellipticity of the outer coating being less than 2%.2. The optical fiber of claim 1 , wherein the optical fiber has ...

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Номер записи: 41
21-04-2016 дата публикации

Low Loss Optical Fiber And Method Of Making The Same

Номер: US20160109651A1
Автор: David W. Peckham, Dennis J. Trevor, Jorgen Ostgaard Olsen, Man F. Yan, Ole A. Levring, Patrick W. Wisk, Peter I. Borel, Rasmus V.S. Jensen
Принадлежит: OFS FITEL LLC

The core region of an optical fiber is doped with chlorine in a concentration that allows for the viscosity of the core region to be lowered, approaching the viscosity of the surrounding cladding. An annular interface region is disposed between the core and cladding and contains a concentration of fluorine dopant sufficient to match the viscosity of the core. By including this annular stress accommodation region, the cladding layer can be formed to include the relatively high concentration of fluorine required to provide the desired degree of optical signal confinement (Le., forming a “low loss” optical fiber).

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Номер записи: 42
02-04-2020 дата публикации

SELF-LEARNING FIBER PROCESSING SYSTEM AND METHOD

Номер: US20200102242A1
Автор: Clark Brett, Lower John, Wiley Robert G.
Принадлежит:

Provided is a system for and a method of processing an optical fiber, such as tapering an optical fiber. The method includes receiving fiber parameters defining characteristics of an optical fiber, modeling an idealized fiber based on the fiber parameters to establish modeled data, and establishing processing parameters. A processing operation is performed on the optical fiber according to the processing parameters to produce a resultant fiber. Aspects of the resultant fiber are measured to establish measured data. The measured data and the modeled data are normalized to a common axis and a difference between the two is determined. The processing parameters are adjusted based on the differences. 1. A method of tapering an optical fiber by a fiber tapering machine having at least one processor , memory , a heat source , at least one fiber holder , and or more sensors , comprising:receiving fiber parameters defining taper characteristics of an optical fiber to be tapered;modeling an idealized fiber taper based on the fiber parameters to establish modeled data by the processor;establishing processing parameters from the fiber parameters for controlling aspects of the fiber tapering machine, by the processor;performing a tapering operation on the optical fiber according to the processing parameters to produce a resultant fiber taper, the tapering operation performed by applying heat from the heat source to a portion of the fiber while translating a fiber holder to which the fiber is coupled;measuring aspects of the resultant fiber taper to establish measured data with the one or more sensors;determining differences between the measured data and the modeled data by the processor; andadjusting one or more of the processing parameters to form adjusted processing parameters based on the differences, by the processor.2. The method of claim 1 , further comprising:performing a next tapering operation using the adjusted processing parameters to form a new resultant fiber taper. ...

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Номер записи: 43
26-04-2018 дата публикации

PURGE DEVICE FOR AN OPTICAL FIBER DRAW SYSTEM

Номер: US20180111871A1
Автор: Jewell John Michael, Kladias Nikolaos Pantelis, Nason Robert Walter, Reding Bruce Warren, Richter Edward Barry, Veber Daniel Paul, Zhou Chunfeng
Принадлежит:

An optical fiber production system is provided which includes a slow-cooling device and a purge device positioned above the slow-cooling device. The purge device includes a tube defining an inlet. An optical fiber extends through the slow-cooling device and the purge device. The purge device is configured to inject a purge gas through the inlet and against the optical fiber. 1. An optical fiber production system , comprising:a slow-cooling device;a purge device positioned above the slow-cooling device, the purge device comprising a tube defining an inlet; andan optical fiber extending through the slow-cooling device and the purge device, wherein the purge device is configured to inject a purge gas through the inlet and against the optical fiber.2. The system of claim 1 , wherein the injection of the purge gas disrupts a boundary layer of gas present along the optical fiber sufficiently to result in a reduction of particles present in the boundary layer from flowing into the slow-cooling device.3. The system of claim 2 , wherein the purge gas has a flow rate through the inlet of between about 10 SLPM and about 40 SLPM.4. The system of claim 1 , wherein the inlet is continuous around a circumference of the tube.5. The system of claim 1 , wherein the inlet has an angle with respect to an X-Y plane of the optical fiber production system of greater than about 0° and less than about 40°.6. The system of claim 5 , wherein the inlet has an angle with respect to an X-Y plane of the optical fiber production system of greater than about 10° and less than about 35°.7. The system of claim 1 , wherein the inlet has a height of between about 0.1 mm and about 10.0 mm.8. The system of claim 1 , wherein the tube further defines an inlet manifold claim 1 , the inlet fluidly coupling the inlet manifold and a passageway of the tube.9. An optical fiber production system claim 1 , comprising:a slow-cooling device; 'a tube defining a passageway through which an optical fiber is drawn and ...

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Номер записи: 44
27-04-2017 дата публикации

CHOPPED-FIBERS WITH AXIAL PROPERTY GRADIENT FOR MOLDED PARTS

Номер: US20170113962A1
Автор: Hamburgen William, Rivera Felix Jose Alvarez
Принадлежит:

A portable computing device includes a processor, a memory, and a portable computing device case that encloses one or more integrated circuits, including at least the processor and the memory. The case includes a molded fiber-reinforced polymer (FRP) material that includes a polymer material and elongated fibers that adhere to the polymer material and that have a property that varies over a length of the fibers along an elongation axis of the fibers, wherein an adhesion strength between the fibers and the polymer is determined at least in part by a property of the fibers that varies over a length of the fibers along the elongation axis. 1. A method of making glass fibers for use in a molded , fiber-reinforced polymer material , the method comprising:drawing a fiber from a glass preform;vibrating the drawn fiber as it is being drawn;varying a frequency and/or amplitude of the vibration, wherein the diameter of the drawn fiber is determined at least in part by the amplitude and/or frequency of the vibration;cutting the drawn fiber into subsections, wherein the subsections have a diameter that varies over a length along an elongation axis of the subsections.2. The method of claim 1 , wherein the subsections have a diameter at the ends of the subsections that is smaller than the diameter at the middle of the subsections.3. The method of claim 1 ,wherein the vibrating the drawn fiber as it is being drawn includes vibrating the fiber at a first frequency and add a second frequency, andwherein varying a frequency of the vibration includes varying the frequency and/or amplitude of the first vibration frequency and varying the frequency and/or amplitude of the second vibration frequency.4. The method of claim 1 , further comprisinglocally pitting a surface of the drawn fiber and varying the amplitude and/or frequency of the pitting along the length of the fiber. This application is a divisional of, and claims priority to, U.S. application Ser. No. 13/841,444, filed Mar. 15, ...

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Номер записи: 45
17-07-2014 дата публикации

Glass preform heating furnace

Номер: US20140196505A1
Автор: Iwao Okazaki, Masatoshi Hayakawa, Tadashi Enomoto, Takashi Yamazaki
Принадлежит: Sumitomo Electric Industries Ltd

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.

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Номер записи: 46
09-04-2020 дата публикации

CAPILLARY TUBE AND METHOD OF PRODUCING THE SAME

Номер: US20200109078A1
Автор: Schmitt Clemens, Weidlich Stefan, Werner Joerg
Принадлежит: HERAEUS QUARZGLAS GMBH & CO. KG

A method of producing a capillary tube from glass includes zonally softening a tubular preform having an outer diameter D, an inner diameter Dand a diameter ratio D—with D=D/D—in a heating zone heated to a draw temperature Tand drawing off continuously from the softened region a capillary strand having an outer diameter d, an inner diameter dand a diameter ratio d—with d=d/d—at a draw speed vand cutting the capillary to length therefrom. For cost-effective production of a thick-walled capillary by drawing from a preform without strict requirements for the geometry and dimensional accuracy of the preform, the capillary bore is subjected in the heating zone to a shrinkage process based on the action of draw temperature Tand surface tension, such that the diameter ratio dof the capillary strand is adjusted to a value greater than the diameter ratio Dof the preform by at least a factor of 5. 1. A method of producing a capillary tube from glass , comprising:{'sub': OD', 'ID', 'rel', 'rel', 'OD', 'ID', 'draw, 'zonally softening a tubular preform having an outer diameter D, an inner diameter Dand a diameter ratio D—with D=D/D—in a heating zone heated to a draw temperature T;'}{'sub': OD', 'ID', 'rel', 'rel', 'OD', 'ID', 'draw, 'drawning off continuously from the softened region a capillary strand having an outer diameter d, an inner diameter dand a diameter ratio d—with d=d/d—at a draw speed v; and'}cutting the capillary tube to length therefrom;{'sub': draw', 'rel', 'rel, 'characterized in that a capillary bore is subjected in the heating zone to a shrinkage process based on the action of draw temperature Tand surface tension in such a way that the diameter ratio dof the capillary strand is adjusted to a value greater than the diameter ratio Dof the preform by at least a factor of 5, and wherein a multimode optical fiber preform or a single-mode optical fiber preform with a preform core surrounding an inner bore and a preform cladding covering the preform core is employed ...

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Номер записи: 47
04-05-2017 дата публикации

High strength glass fiber

Номер: US20170121205A1
Автор: Eckert Hellmut, Gao Ren, Wang Huanping, Xu Shiqing, Yang Qinghua, Zhang Xianghua, Zhu Qingong
Принадлежит:

A high strength glass fiber is prepared by following steps: weighing raw materials according to a mass percentage of 50-60% silica sol, 24-31% aluminum sol, 8-11% magnesia, 4-5% calcium oxide, 0.1-2% titanium dioxide, 0-0.5% ferric oxide, 0.5-2% niobium pentoxide, 0.5-1.5% antimony trioxide, 0.3-1.5% bismuth nitrate, and 0.1-0.5% boric acid. Deionized water is added. The raw material undergoes mixing by ball milling, spray-drying, calcining, isostatic pressing, melting, and wire-drawing. The invention adopts silicon sol, aluminum sol and bismuth nitrate. Through ball milling and spray-drying, silicon aluminum barium plasmas is evenly coated on surface of other oxide powders. Then nano particles, of silica, alumina and bismuth oxide are obtained by calcining. Under the effect of the high specific surface energy of nano particles, and the close contact of each component, high strength glass fiber is obtained in relatively low fiber drawing temperature while the glass melting temperature and time are significantly reduced. 1(1) weighing in a basis of a mass percentage of following raw materials, simultaneously, weighing zirconia grinding ball 4-5 times the weight of the raw materials and deionized water 1-2 times the weight of the raw materials, then ball milling for 12-24 hours and obtaining a mixture, wherein: a mass percentage of the raw materials is as follows:. A method for preparing a high strength glass fiber, comprising steps of:(2) spray-drying the mixture through an atomizer, removing the deionized water, and obtaining a powder material, wherein: an inlet air temperature of spray-drying is 180-280° C. and an outlet air temperature thereof is 30-100° C.;(3) calcining the powder material at 700-900° C. for 1-3 hours, and then cooling the calcined powder material to a room temperature;(4) putting the calcined and cooled powder material into a rubber mold, isostatic pressing at 100-300 MPa in a cold isostatic press, and obtaining a compact block;(5) putting the ...

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Номер записи: 48
16-04-2020 дата публикации

FIBER PREFORM, OPTICAL FIBER AND METHODS FOR FORMING THE SAME

Номер: US20200115270A1
Автор: Huang Xiaosheng, Yoo Seongwoo
Принадлежит:

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 ...

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Номер записи: 49
03-06-2021 дата публикации

METHOD FOR PRODUCING POROUS GLASS FINE PARTICLE BODY AND METHOD FOR PRODUCING OPTICAL FIBER PREFORM

Номер: US20210163337A1
Автор: Sato Nobutoshi
Принадлежит: FUJIKURA LTD.

A method for producing a porous glass fine particle body includes: a first layer formation step of continuously forming in a longitudinal direction of a rotating starting base material without a break, a first soot layer on a surface of the rotating starting base material; and an second layer formation step of forming second soot layers on an outside of the first soot layer while supplying a raw material gas to each of a burner among burners of a burner group and moving the burner group in a reciprocating manner in the longitudinal direction relative to the rotating starting base material. The burner group and the starting base material move relatively to each other along the longitudinal direction. 1. A method for producing a porous glass fine particle body , the method comprising:a first layer formation step of continuously forming in a longitudinal direction of a rotating starting base material without a break, a first soot layer on a surface of the rotating starting base material; anda second layer formation step of forming second soot layers on an outside of the first soot layer while supplying a raw material gas to each of a burner among burners of a burner group and moving the burner group in a reciprocating manner in the longitudinal direction relative to the rotating starting base material, whereinthe burner group and the starting base material move relatively to each other along the longitudinal direction.2. The method according to claim 1 , wherein the first layer formation step comprises:heating the first soot layer with a flame of a burner in the burner group that is different from a burner in the burner group that forms the first soot layer.3. The method according to claim 1 , wherein the second layer formation step comprises:after the first layer formation step is completed, starting to supply the raw material gas to a burner in the burner group that is different from a burner in the burner group that forms the first soot layer.4. The method according ...

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Номер записи: 50
09-05-2019 дата публикации

A METHOD OF FIBER PRODUCTION

Номер: US20190135679A1
Автор: JAKOBSEN Christian, LYNGSØE Jens Kristian, MICHIELETTO Mattia, SIMONSEN Harald Roager
Принадлежит: NKT Photonics A/S

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 ...

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Номер записи: 51
14-08-2014 дата публикации

OPTICAL FIBER PRODUCING METHOD AND APPARATUS AND OPTICAL FIBER

Номер: US20140226948A1
Автор: ENOMOTO Tadashi, Furusyou Masaru, HAYAKAWA Masatoshi, OKAZAKI Iwao, Shiozaki Manabu, UENOYAMA Norihiro, YAMAZAKI Takashi
Принадлежит:

An apparatus includes a susceptor and a protective pipe. A gas containing 50% or more of argon or nitrogen is used as a gas to be supplied into the susceptor. The protective pipe has a heat insulating region () enclosed with a heat insulator () with a length of Db (mm) at the upper section thereof and a non-heat insulating region () not enclosed with any heat insulators at the lower section thereof. The temperature of the glass fiber at the outlet of the protective pipe becomes 1700° C. or less. The outer diameter of the glass fiber at the outlet of the protective pipe is within a range of the target outer diameter of the glass fiber+6 μm or less. 1. An optical fiber producing method , using an apparatus comprising a susceptor into which an optical fiber preform is inserted and a heater disposed outside the susceptor to heat the susceptor from the outside , for producing an optical fiber by drawing a glass fiber while the optical fiber preform is heated and melted and by drawing out the fiber through the outlet at the lower section of the susceptor to the outside ,wherein a gas containing 50% or more of argon or nitrogen is used as a gas to be supplied into the susceptor, and a protective pipe with a length of Da (mm) is provided under the susceptor, the protective pipe having a heat insulating region enclosed with a heat insulator with a length of Db (mm) at the upper section thereof and a non-heat insulating region not enclosed with any heat insulators at the lower section thereof, andwherein, when the drawing velocity of the glass fiber is V (m/min), the lengths of Da and Db are set to satisfy “V/Da≦1.2 and V/Db≦2.3” so that the temperature of the glass fiber at the outlet of the protective pipe becomes 1700° C. or less and so that the outer diameter of the glass fiber at the outlet of the protective pipe is within a range of the target outer diameter of the glass fiber+6 μm or less.2. An optical fiber producing method , using an apparatus comprising a susceptor ...

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Номер записи: 52
17-06-2021 дата публикации

METHODS AND SYSTEMS FOR PROCESSING OPTICAL FIBER

Номер: US20210179477A1
Автор: Dunwoody Steven Akin, Kladias Nikolaos Pantelis, Moore Robert Clark, Pace Jason Roy, Thomas Christopher Scott, Wakefield Bryan William, Zhou Chunfeng
Принадлежит:

A system for processing optical fiber includes a draw furnace, a fiber conveyance pathway extending between an upstream end positioned at the draw furnace and a downstream end positioned opposite the upstream end, where optical fiber is conveyed along the fiber conveyance pathway from the upstream end to the downstream end in a fiber conveyance direction, a muffle in communication with the draw furnace and positioned downstream of the draw furnace, a second cooling device annularly surrounding the fiber conveyance pathway downstream from the draw furnace, the second cooling device including one or more second cooling device heating elements and a first cooling device positioned between the draw furnace and the second cooling device, wherein the first cooling device directs a fluid to contact the optical fiber. 1. A method for processing optical fiber , the method comprising:conveying an optical fiber through a first cooling device, the first cooling device having a first inlet and a first outlet positioned opposite the first inlet, the optical fiber entering the first cooling device at the first inlet and exiting the first cooling device at the first outlet, the optical fiber having a first temperature and a first diameter at the first inlet, and a second temperature and a second diameter at the first outlet;cooling the optical fiber at a rate greater than 10000° C./s in the first cooling device;conveying the optical fiber from the first cooling device to and through a second cooling device at a velocity greater than 40 m/s, the second cooling device having a second inlet and a second outlet, the optical fiber entering the second cooling device at the second inlet and exiting the second cooling device at the second outlet, the optical fiber having a third temperature and a third diameter at the second inlet and a fourth temperature and a fourth diameter at the second outlet, the third temperature greater than 1100° C. and the fourth diameter exceeding 95% of the ...

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Номер записи: 53
17-06-2021 дата публикации

APPARATUSES AND METHODS FOR PROCESSING AN OPTICAL FIBER PREFORM

Номер: US20210179478A1
Автор: Abedijaberi Arash, Chizhova-Notkina Elena Alekseevna, Dawes Steven Bruce, Panin Nikolay Anatolyevich
Принадлежит:

Apparatuses and methods for processing an optical fiber preform are disclosed. According to one aspect, an apparatus may generally include a muffle defining an interior volume enclosed by at least one sidewall and a handle assembly for supporting the optical fiber preform in the muffle. The handle assembly may be removably coupled to the muffle and extend into the interior volume. At least one baffle may be positioned in the interior volume and define an upper portion of the interior volume and a lower portion of the interior volume. The at least one baffle may define at least one flow channel between the upper portion of the interior volume and the lower portion of the interior volume. 1. An apparatus for processing an optical fiber preform , the apparatus comprising:a muffle defining an interior volume enclosed by at least one sidewall;a handle assembly for supporting the optical fiber preform in the muffle, the handle assembly removably coupled to the muffle and extending into the interior volume; andat least one baffle attached to the handle assembly and positioned in the interior volume, the at least one baffle defining an upper portion of the interior volume and a lower portion of the interior volume,wherein the at least one baffle defines at least one flow channel between the upper portion of the interior volume and the lower portion of the interior volume.2. The apparatus of claim 1 , wherein the handle assembly comprises:a top flange; anda support shaft for supporting the optical fiber preform in the muffle, the support shaft extending from the top flange.3. The apparatus of claim 2 , wherein the at least one baffle extends radially outward from the support shaft.4. The apparatus of claim 3 , wherein the apparatus comprises a first baffle and a second baffle claim 3 , the first baffle positioned at a first longitudinal distance on the support shaft and the second baffle positioned at a second longitudinal distance on the support shaft claim 3 , wherein a ...

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Номер записи: 54
23-05-2019 дата публикации

FIBER OPTIC MANUFACTURING IN SPACE

Номер: US20190152835A1
Автор: Starodubov Dmitry, Volfson Leo
Принадлежит: FOMS Inc.

Aspects of the embodiments include an optical fiber formed in a low gravity environment. The optical fiber can be used in airframe applications for missile defense, oil-field applications for down-well laser applications, optical communications, and other applications. The optical fiber can include a fluoride composition, such ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN), and can be characterized by an insertion loss in a range from 13 dB/1000 km to 120 dB/1000 km. The optical fiber can deliver optical energy with low insertion loss at the desired power and wavelength for the various applications. 1. A system for delivering optical energy through an optical fiber formed in a low gravity environment , the system comprising:a laser source;an optical aperture; andthe optical fiber formed in the low gravity environment coupling the laser source to the optical aperture.2. The system of claim 1 , wherein the optical fiber comprises fluoride.3. The system of claim 2 , wherein the optical fiber comprises ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN).4. The system of claim 1 , wherein the optical fiber comprises an insertion loss in a range from 13 dB per 1000 km to 120 dB per 1000 km.5. The system of claim 1 , wherein the optical fiber comprises an insertion loss less than or equal to 0.02 dB per km at an operating wavelength longer than 1.7 microns.6. The system of claim 1 , further comprises an airframe claim 1 , and wherein the optical aperture resides at one or more locations on the airframe.7. The system of claim 7 , wherein the laser source is to emit laser light at a power in a range from 1 watt to 100 watts.8. The system of claim 7 , wherein the laser source is to emit a laser at a wavelength within a range from 1.7 microns to 7 microns through the optical fiber.9. The system of claim 1 , wherein the optical aperture is configured for down-well applications.10. The system of claim 9 , wherein the laser source is to emit laser light at a power in a range from 1 kilowatt to 100 kilowatts.11. ...

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Номер записи: 55
04-09-2014 дата публикации

Process for producing a cylindrical component made of glass by elongation

Номер: US20140245796A1
Автор: Harald Hain, Oliver Ganz, THOMAS Bernard, Thomas Bogdahn
Принадлежит: Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV, Heraeus Quarzglas GmbH and Co KG

A method for using a temperature control loop in order to further develop process control during elongation of a cylindrical preform such that a component strand with high dimensional accuracy can be drawn even in the presence of temperature-effective defects during the elongation process: (a) the continuous measurement of a first temperature value, T top , at an upper measuring point on the surface of the cylindrical preform; (b) the continuous measurement of a second temperature value, T bottom , at a lower measuring point; (c) calculation of a temperature distribution in the region between the measuring points T top and T bottom , and determination of a modelled deformation temperature, T model , using an algorithmic model taking with first and the second temperature values as model input parameters, and the modelled deformation temperature, T model , as a regulating variable and the heating-zone temperature T oven as a manipulated variable for the temperature-control loop.

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Номер записи: 56
15-06-2017 дата публикации

High chlorine content low attenuation optical fiber

Номер: US20170168231A1
Автор: Dana Craig Bookbinder, George Edward Berkey, Ming-Jun Li, Pushkar Tandon
Принадлежит: Corning Inc

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 1MAX , and a inner cladding region having refractive index Δ 2MIN surrounding the core, where Δ 1MAX >Δ 2MIN .

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Номер записи: 57
23-06-2016 дата публикации

A High-Efficiency Parallel-Beam Laser Optical Fibre Drawing Method and Optical Fibre

Номер: US20160181758A1
Автор: Chen Wei, DAN Rong, DU Cheng, Du Kun, KE Yili, Li Shiyu, Luo Wenyong, MO QI, Zhang Tao
Принадлежит:

Provided are a high-efficiency parallel-beam laser optical fiber drawing method and optical fiber, the method including the steps of: S: providing base planes on the side surfaces of both a gain optical fiber preform and a pump optical fiber preform, inwardly processing the base plane of the gain optical fiber preform to make a plurality of ribs protrude, and inwardly providing a plurality of grooves on the base plane of the pump optical fiber preform; S: embedding the ribs into the grooves, tapering and fixing one end of the combination of the ribs and the grooves to form a parallel-beam laser optical fiber preform; S: drawing the parallel-beam laser optical fiber preform into parallel-beam laser optical fibers. The process has high repeatability, and the obtained parallel-beam laser achieves peelability of pump optical fibers in a set area, thus facilitating multi-point pump light injection of parallel-beam laser optical fibers. 1. A high-efficiency parallel-beam laser optical fibre drawing method , comprising the steps of:{'b': '1', 'S. respectively arranging a base plane at the side surfaces of both a gain optical fibre perform and a pump optical fibre perform; processing the base plane of the gain optical fibre perform inwards to make multiple ribs protrude, planes at both sides of each rib being machined surfaces; and arranging multiple grooves inwards on the base plane of the pump optical fibre perform, the ribs fitting the grooves;'}{'b': '2', 'S. inserting the ribs of the gain optical fibre perform into the grooves of the pump optical fibre perform; and after the two are combined, tapering and fixing one end of the whole to form a parallel-beam laser optical fibre perform; and'}{'b': '3', 'S. by drawing, making the parallel-beam laser optical fibre perform into a parallel-beam laser optical fibre.'}2. The high-efficiency parallel-beam laser optical fibre drawing method according to claim 1 , wherein the ribs are rectangular prisms; and a centre of a cross ...

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Номер записи: 58
28-05-2020 дата публикации

ON-LINE ANNEALING OF LARGE FUSED QUARTZ INGOTS

Номер: US20200165151A1
Автор: Gromann Boris, Mundy Alan, Sayce Ian George
Принадлежит:

A method and apparatus for manufacturing a quartz glass ingot of large cross-sectional area by continuous flame-fusion whereby on-line crack-free cutting of the ingot is ensured by using the internal heat of the ingot to permit equilibration of the internal and surface temperatures while passing through one or more annealing chambers, thus ensuring controlled cooling to temperature at which it is possible to cut the ingot with a water-cooled saw. 1. A method for continuous production of quartz-glass ingots , of cross-sectional area greater than 96000 mm , comprising the following process steps:a. providing a softened quartz-glass material in a crucible or refractory tank;b. vertically drawing off the softened quartz-glass mass through a die to provide a quartz-glass ingot; andc. on-line cutting of the quartz-glass ingot to a specific length,characterized in that, prior to step c., the quartz-glass ingot is passed through at least one insulated chamber in which controlled cooling of the ingot is caused to take place.2. The method according to claim 1 , characterized in that the ingot has an external surface temperature Tand a center temperature T claim 1 , whereby the difference between Tand Tof the ingot is progressively reduced during the insulation by the internal heat of the descending quartz-glass ingot.3. The method according to claim 1 , characterized in that the quartz-glass ingot is cooled to a surface temperature between 900 and 1150° C. prior to insulation.4. The method according to claim 1 , characterized in that the quartz-glass ingot is cooled to a surface temperature of less than 250° C. prior to cutting.5. The method according to claim 1 , to characterized in that the residence time during insulation is 20 hrs to 150 hrs.6. The method according to claim 1 , characterized in that the difference between the external surface temperature Tand a center temperature Tafter insulation is less than 40° C.7. The method according to claim 1 , characterized in ...

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Номер записи: 59
06-06-2019 дата публикации

SYSTEM AND METHOD FOR PRODUCING VORTEX FIBER

Номер: US20190170933A1
Автор: ASHRAFI SOLYMAN
Принадлежит:

The present invention, as disclosed and described herein, in one aspect thereof comprises a preform for making a vortex optical fiber includes a glass cylinder formed substantially of silicone dioxide that defines a core portion along a longitudinal axis of the glass cylinder and a cladding portion surrounding the core portion. The glass cylinder further defines a plurality of holes running parallel to the longitudinal axis from a first end of the glass cylinder to a second end of the glass cylinder. 1. A preform for making a vortex optical fiber , comprising:a glass cylinder formed substantially of silicone dioxide that defines a core portion along a longitudinal axis of the glass cylinder and a cladding portion surrounding the core portion; andwherein the glass cylinder further defines a plurality of holes running parallel to the longitudinal axis from a first end of the glass cylinder to a second end of the glass cylinder.2. The preform of claim 1 , wherein the plurality of holes further includes a first hole along the longitudinal axis of the glass cylinder through the core portion and a plurality of second holes located between the first hole and a circumference of the glass cylinder through the cladding portion.3. The preform of claim 1 , wherein the plurality of holes are drilled in the glass cylinder.4. The preform of claim 1 , wherein the preform defines a refractive index profile that contains a valley along the longitudinal axis of the glass cylinder and a pair of peaks along edges of the core portion within the cladding portion.5. The preform of claim 1 , wherein the vortex optical fiber generated from the preform support propagation of optical signals including orthogonal functions.6. A preform for making a vortex optical fiber claim 1 , comprising:a glass cylinder formed substantially of silicone dioxide that defines a core portion along a longitudinal axis of the glass cylinder and a cladding portion surrounding the core portion;wherein the glass ...

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Номер записи: 60
28-05-2020 дата публикации

SYSTEM AND METHOD FOR POSITIONING AN OPTICAL PREFORM IN A FURNACE

Номер: US20200166706A1
Автор: Anderson Erling Richard, Roberts Kenneth William
Принадлежит:

A system for positioning an optical preform in a furnace is provided that includes an upper muffle and a downfeed handle assembly with a tube defining a first end and a second end, the second end extending into the upper muffle. A handle is disposed within the tube. A second end of the handle extends into the upper muffle and a seal assembly is positioned around both the tube and the handle. The first end of the handle extends through the seal assembly and a drive assembly is coupled with the downfeed handle. 1. A method for positioning an optical preform in a furnace , comprising:providing a chuck interface movably coupled with a drive assembly;positioning the chuck interface within a seal assembly;coupling a handle within the chuck interface, an optical fiber preform positioned on an opposite end of the handle from the chuck interface;positioning the handle within a tube;positioning the optical fiber preform within a furnace; andmoving the handle at least one of laterally and rotationally within the tube such that the optical fiber preform is moved at least one of laterally and rotationally within the furnace.2. The method of claim 1 , wherein the handle extends through the seal assembly.3. The method of claim 2 , wherein the handle moves laterally within the tube and the lateral movement of the handle is independent of the tube.4. The method of claim 3 , wherein the handle moves rotationally within the tube and the rotational movement of the handle is independent of the tube.5. The method of claim 1 , wherein the handle and the tube are configured to move vertically together.6. The method of claim 1 , wherein the chuck interface is coupled to a face seal within the seal assembly.7. A system for positioning an optical preform in a furnace claim 1 , comprising: a tube defining a first end and a second end;', 'a handle disposed within and extending through the tube; and', 'a seal assembly extending around both the handle and the tube, the handle extending through ...

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Номер записи: 61
30-06-2016 дата публикации

Method of forming conical shape on glass rod, and glass rod

Номер: US20160185646A1
Автор: Tetsuya Otosaka
Принадлежит: Shin Etsu Chemical Co Ltd

In a method of forming a conical shape on a glass rod including an effective portion and an ineffective portion adjoining the effective portion to form a conical shape in the effective portion by simultaneously heating a boundary and the vicinity of the boundary between the effective portion and the ineffective portion and pulling an end of the ineffective portion, the temperature of a heater is raised and a heating target on the glass rod is simultaneously moved from the ineffective portion to the boundary.

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Номер записи: 62
30-06-2016 дата публикации

Method of manufacturing optical fiber and apparatus of manufacturing the same

Номер: US20160185661A1
Автор: OKADA Kenji
Принадлежит: FUJIKURA LTD.

A method of manufacturing an optical fiber includes drawing an optical fiber preform and forming a bare optical fiber, disposing a coating layer formed of a resin on an outer circumference of the bare optical fiber, and curing the coating layer and obtaining an optical fiber. A direction of the bare optical fiber is changed by a direction changer in any position from drawing the optical fiber to disposing the coating layer, and the direction changer includes a guide groove which guides the bare optical fiber, 1. A method of manufacturing an optical fiber , comprising:drawing an optical fiber preform and forming a bare optical fiber;disposing a coating layer formed of a resin on an outer circumference of the bare optical fiber; andcuring the coating layer and obtaining an optical fiber, wherein:a direction of the bare optical fiber is changed by a direction changer in any position from drawing the optical fiber to disposing the coating layer;the direction changer includes a guide groove which guides the bare optical fiber;a blowout port of a fluid which floats the bare optical fiber wired along the guide groove is formed along the guide groove in the guide groove;when a direction of the bare optical fiber is changed by the direction changer, the fluid is introduced into the guide groove from the blowout port and the bare optical fiber is floated and a Reynolds number of the fluid is in a range of 1200-3500; andthe Reynolds number in an inlet wire portion of the bare optical fiber to the guide groove and an outlet wire portion from the guide groove is greater than the Reynolds number in an intermediate portion between the inlet wire portion and the outlet wire portion.2. The method of manufacturing an optical fiber according to claim 1 , wherein the Reynolds number is controlled by measuring a flotation amount of the bare optical fiber is measured and adjusting an introduced flow volume of the fluid to the direction changer based on a measurement value of the ...

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Номер записи: 63
08-07-2021 дата публикации

METHOD FOR MANUFACTURING MULTIMODE OPTICAL FIBERS

Номер: US20210208332A1
Автор: Chen Xin, Li Ming-Jun, Patel Simit Mayank
Принадлежит:

A method of manufacturing a multimode optical fiber includes specifying a peak wavelength λfor the multimode optical fiber. The peak wavelength λcorresponds to a wavelength at which the multimode optical fiber has a maximum bandwidth. The multimode optical fiber comprises a core and a cladding surrounding and directly adjacent to the core. The core has a radius rand a maximum relative refractive index Δ>0. The cladding comprises a depressed-index region having a minimum relative refractive index Δ<0 and a volume v. A draw tension T for the multimode optical fiber is selected based on a correlation relating peak wavelength λto draw tension T, the correlation comprising a correlation constant. The correlation constant K is a function of at least one of Δ, r, v, Δ, and λ. The multimode optical fiber is drawn from a preform at the draw tension T. 1. A method of manufacturing a multimode optical fiber , comprising:{'sub': P', 'P', '1', '1,MAX', '3,MIN, 'specifying a peak wavelength λfor the multimode optical fiber, the peak wavelength λcorresponding to a wavelength at which the multimode optical fiber has a maximum bandwidth, the multimode optical fiber comprising a core and a cladding surrounding and directly adjacent to the core, the core having a radius rand a maximum relative refractive index Δ>0, the cladding comprising a depressed-index region having a minimum relative refractive index Δ<0 and a volume v;'}{'sub': P', '1,MAX', '1', '3,MIN', 'P, 'selecting a draw tension T for the multimode optical fiber based on a correlation relating peak wavelength λto draw tension T, the correlation comprising a correlation constant, the correlation constant K being a function of at least one of Δ, r, v, Δ, and λ; and'}drawing the multimode optical fiber from a preform at the draw tension T.2. The method of claim 1 , wherein the draw tension T is in a range of from about 45 g to about 220 g.3. The method of claim 1 , wherein the correlation constant K is in a range of from about ...

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Номер записи: 64
20-06-2019 дата публикации

METHOD FOR MANUFACTURING OPTICAL FIBER

Номер: US20190185365A1
Автор: KITAMURA Takayuki
Принадлежит: FUJIKURA LTD.

A method for manufacturing an optical fiber includes: drawing an optical fiber from an optical fiber preform in a drawing furnace; and cooling the optical fiber in an annealing furnace. When the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less. The optical fiber is cooled for 0.01 seconds or more in the annealing furnace so that the temperature of the optical fiber becomes 1300° C. or more and 1800° C. or less. 1. A method for manufacturing an optical fiber comprising:drawing an optical fiber preform in a drawing furnace; andcooling the optical fiber drawn in an annealing furnace;wherein, when the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less, andthe optical fiber is cooled for 0.01 seconds or more in the annealing furnace so that the temperature of the optical fiber becomes 1300° C. or more and 1800° C. or less.2. The method for manufacturing an optical fiber according to claim 1 , wherein the temperature difference is 180° C. or less.3. The method for manufacturing an optical fiber according to claim 1 , wherein claim 1 ,when the temperature difference is 0° C. or more and 60° C. or less, a preset temperature of the annealing furnace is set lower than the temperature of the optical fiber, andwhen the temperature difference is higher than 60° C. and equal to 300° C. or less, the temperature of the optical fiber is temporarily increased and then decreased in the annealing furnace.4. The method for manufacturing an optical fiber according to claim 2 , wherein claim 2 , when the temperature difference is higher than 60° C. and equal to 180° C. or less claim 2 , the temperature of the optical fiber is increased to a preset temperature of the annealing furnace for 0.001 to 0.1 ...

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Номер записи: 65
18-06-2020 дата публикации

MANUFACTURING METHOD OF OPTICAL FIBER

Номер: US20200189958A1
Автор: Kawaguchi Yuki, SAITO Takahiro, TOYOKAWA Shuhei
Принадлежит: Sumitomo Electric Industries, Ltd.

A method for manufacturing an optical fiber is disclosed. The method for manufacturing an optical fiber includes: drawing an optical fiber by heating an optical fiber preform inside a drawing furnace into which a first gas is introduced; and annealing the optical fiber by causing the optical fiber to pass through an annealing furnace disposed downstream of the drawing furnace and adjusted to a temperature lower than a temperature at which the optical fiber preform is heated. In the annealing, a second gas having a lower heat conductivity than the first gas is introduced into the annealing furnace through one or more gas introduction ports such that a total flow rate becomes 3 slm or higher, and a flow rate of the second gas per gas introduction port is adjusted to 30 slm or lower. 1. A method for manufacturing an optical fiber comprising:drawing an optical fiber by heating an optical fiber preform inside a drawing furnace into which a first gas is introduced; andannealing the optical fiber by causing the optical fiber to pass through an annealing furnace disposed downstream of the drawing furnace and adjusted to a temperature lower than a temperature at which the optical fiber preform is heated,wherein in the annealing, a second gas having a lower heat conductivity than the first gas is introduced into the annealing furnace through one or more gas introduction ports such that a total flow rate becomes 3 slm or higher, and a flow rate of the second gas per gas introduction port is adjusted to 30 slm or lower.2. The method for manufacturing an optical fiber according to claim 1 , wherein the optical fiber having a temperature within a range of 1 claim 1 ,300° C. to 1 claim 1 ,650° C. is led to the annealing furnace in the annealing.3. The method for manufacturing an optical fiber according to claim 1 , wherein a temperature of the annealing furnace is set within a range of 800° C. to 1 claim 1 ,400° C. in the annealing.4. The method for manufacturing an optical fiber ...

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Номер записи: 66
29-07-2021 дата публикации

OPTICAL FIBER DRAW FURNACE SYSTEM AND METHOD

Номер: US20210230044A1
Автор: Hoffmann Tammy Michelle, Jewell John Michael, Kladias Nikolaos Pantelis
Принадлежит:

An optical fiber draw system and method of operating thereof. The method includes positioning a downfeed handle for supporting an optical fiber preform within a furnace such that the downfeed handle is movable within the furnace. The method further includes operating one or more heating elements to thermally heat at least a portion of an upper muffle extension disposed within the furnace, the one or more heating elements being moveable with the downfeed handle. 1. A method of operating an optical fiber draw furnace , the method comprising:positioning a downfeed handle for supporting an optical fiber preform within a furnace such that the downfeed handle is movable within the furnace; andoperating one or more heating elements to thermally heat at least a portion of an upper muffle extension disposed within the furnace, the one or more heating elements being moveable with the downfeed handle.2. The method of claim 1 , further comprising injecting a process gas around the downfeed handle.3. The method of claim 2 , wherein the process gas is at least one of nitrogen and argon.4. The method of claim 1 , further comprising operating a lower heater within the furnace claim 1 , the upper muffle extension being disposed above the lower heater within the furnace.5. The method of claim 1 , wherein operating the one or more heating elements comprises heating the downfeed handle such that only a portion of the downfeed handle that is disposed within the upper muffle extension is heated.6. The method of claim 1 , wherein operating the one or more heating elements comprises heating the downfeed handle to a temperature ranging from about 400° C. to about 1000° C.7. The method of claim 6 , wherein operating the one or more heating elements comprises heating the downfeed handle to a temperature of about 800° C.8. The method of claim 1 , wherein operating the one or more heating elements comprises sequentially heating a plurality of zones of the downfeed handle.9. The method of claim ...

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Номер записи: 67
20-07-2017 дата публикации

MANUFACTURING METHOD FOR OPTICAL FIBER

Номер: US20170203996A1
Автор: Hirafune Shunichirou, KITAMURA Takayuki
Принадлежит: FUJIKURA LTD.

There is provided a manufacturing method for an optical fiber that easily reduces transmission losses in the optical fiber. The method includes a drawing process P of drawing an optical fiber from an optical fiber preform P in a drawing furnace and a slow cooling process P of slowly cooling the optical fiber having been drawn in the drawing process P in an annealing furnace The temperature of the optical fiber to be delivered into the annealing furnace is a temperature of 1,300° C. or more and 1,650° C. or less. The temperature of the optical fiber to be delivered out of the annealing furnace is a temperature of 1,150° C. or more and 1,400° C. less. 1. A manufacturing method for an optical fiber comprising:a drawing process of drawing an optical fiber from an optical fiber preform in a drawing furnace; anda slow cooling process of slowly cooling the optical fiber drawn in the drawing process in an annealing furnace, whereina temperature of the optical fiber to be delivered into the annealing furnace is 1,300° C. or more and 1,650° C. or less, and a temperature of the optical fiber to be delivered out of the annealing furnace is 1,150° C. or more and 1,400° C. or less.2. The manufacturing method for an optical fiber according to claim 1 , whereinin the slow cooling process, the temperature of the optical fiber is continuously decreased.3. The manufacturing method for an optical fiber according to claim 1 , comprisinga rapid cooling process of rapidly cooling the optical fiber faster than in the slow cooling process after the slow cooling process.4. The manufacturing method for an optical fiber according to claim 1 , whereinthe temperature of the optical fiber to be delivered into the annealing furnace is 1,400° C. or more.5. The manufacturing method for an optical fiber according to claim 1 , whereinthe temperature of the optical fiber to be delivered out of the annealing furnace is 1300° C. or more.6. The manufacturing method for an optical fiber according to claim ...

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Номер записи: 68
18-06-2020 дата публикации

High-density optical fiber ribbon with cladding-strengthened glass optical fibers in a common protective coating and fiber ribbon interconnects employing same

Номер: US20200192023A1
Автор: Haitao Zhang, Jeffery Scott Stone, Mandakini Kanungo, Matthew Ryan Drake, Ming-Jun Li, Philip Simon Brown, QI Wu, Richard Michael Fiacco
Принадлежит: Corning Inc

A high-density optical fiber ribbon is formed by two or more cladding-strengthened glass optical fibers each having an outer surface and that do not individually include a protective polymer coating. A common protective coating substantially surrounds the outer surfaces of the two or more cladding-strengthened glass optical fibers so that the common protective coating is common to the two or more cladding-strengthened glass optical fibers. A fiber ribbon cable is formed by adding a cover assembly to the fiber ribbon. A fiber ribbon interconnect is formed adding one or more optical connectors to the fiber ribbon or fiber ribbon cable. Optical data transmission systems that employ the fiber ribbon to optically connect to a photonic device are also disclosed. Methods of forming the cladding-strengthened glass optical fibers and the high-density optical fiber ribbons are also disclosed.

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Номер записи: 69
03-08-2017 дата публикации

Method of manufacturing optical fiber

Номер: US20170217822A1
Автор: Akihito IMASE
Принадлежит: Fujikura Ltd

An optical fiber manufacturing method includes: melting and drawing an optical fiber preform to form a glass fiber; cooling the glass fiber while inserting the glass fiber into a tubular slow-cooling device from an inlet end toward an outlet end thereof, and lowering an inner wall temperature of the slow-cooling device below a temperature of the glass fiber and providing a pressure gradient in which a pressure increases in a direction from the inlet end toward the outlet end inside the slow-cooling device when cooling the glass fiber, wherein the average pressure change dP/dL in a moving direction of the glass fiber inside the slow-cooling device satisfies the following Formula (1) when the tube inner diameter of the slow-cooling device is defined as D [m] and the length of an internal space of the slow-cooling device in the moving direction of the glass fiber is defined as L [m]. (π D 2 /4)× dP/dL ≦0.03  (1)

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Номер записи: 70
03-08-2017 дата публикации

LOW ATTENUATION FIBER WITH VISCOSITY MATCHED CORE AND INNER CLAD

Номер: US20170219770A1
Автор: Bookbinder Dana Craig, III Hazel Benton, Li Ming-Jun, Matthews, Tandon Pushkar
Принадлежит:

A single mode optical fiber having a core made from silica and less than or equal to about 6.5 weight % germania and having a maximum relative refractive index Δ. The optical fiber also has an inner cladding surrounding the core and having a minimum relative refractive index Δ. A difference between a softening point of the core and a softening point of the inner cladding is less than or equal to about 20° C., and Δ>Δ. The single mode optical fiber may also have an outer cladding surrounding the inner cladding made from silica or SiON. The outer cladding has a maximum relative refractive index Δ, and Δ>Δ. A method for manufacturing an optical fiber includes providing a preform to a first furnace, the preform, drawing the optical fiber from the preform, and cooling the drawn optical fiber in a second furnace. 1. A method of manufacturing a single mode optical fiber , the method comprising: a core comprising silica and less than or equal to 6.5 weight % germania, and', 'an inner cladding that surrounds the core;, 'providing a preform to a first furnace, the preform comprisingdrawing the single mode optical fiber from the preform; andcooling the drawn single mode optical fiber in a second furnace, whereina difference between a softening point of the core and a softening point of the inner cladding is less than or equal to 50° C.2. The method of claim 1 , wherein the cooling comprises cooling the drawn single mode optical fiber from a temperature of 1600° C. to a temperature of 1250° C. at a cooling rate of less than or equal to 5000° C./s.3. The method of claim 2 , wherein the cooling further comprises cooling the drawn single mode optical fiber from a temperature of 1250° C. to a temperature of 1050° C. at a cooling rate of less than or equal to 12000° C./s.4. The method of claim 1 , wherein the cooling comprises cooling the drawn single mode optical fiber from a temperature of 1400° C. to a temperature of 1050° C. at a cooling rate of less than or equal to 5000° C./s. ...

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Номер записи: 71
11-07-2019 дата публикации

OPTICAL FIBER DRAWING METHOD AND DRAWING APPARATUS

Номер: US20190210910A1
Автор: OKAZAKI Iwao, YAMAZAKI Takashi, YOSHIKAWA Satoshi
Принадлежит: Sumitomo Electric Industries, Ltd.

An optical fiber drawing method where a glass base material passes through an opening provided in a drawing furnace from the material side and drawing is performed by suspending and descending the material into the drawing furnace while being sealed by a sealing mechanism provided in the vicinity of the opening, in which a first portion of the sealing mechanism seals a gap between an outer peripheral surface of the material and an inner surface of the opening when drawing starts and a tapered portion of the material starts passing through the first portion, and a second portion is disposed above the first portion before sealing by the first portion becomes ineffective, and then conduction between inside and outside of the drawing furnace is carried out to prevent fluctuation of pressure inside the furnace immediately after disposing the second portion and the conduction is interrupted when the material further descends. 1. An optical fiber drawing method where a glass base material for an optical fiber of which one end is connected to a dummy rod passes through an opening provided in a drawing furnace from the glass base material side and drawing is performed by suspending and descending the glass base material into the drawing furnace while being sealed by a sealing mechanism provided in the vicinity of the opening ,wherein a first sealing portion of the sealing mechanism seals a gap between an outer peripheral surface of the glass base material for an optical fiber and an inner surface of the opening when drawing starts,wherein a second sealing portion is disposed above the first sealing portion before a tapered portion of the glass base material starts passing through the first sealing portion so that sealing by the first sealing portion becomes ineffective,wherein conduction between inside and outside of the drawing furnace is carried out to prevent fluctuation of pressure inside the furnace immediately after disposing the second sealing portion, andwherein the ...

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Номер записи: 72
10-08-2017 дата публикации

METHOD FOR CONTROLLING THE THICKNESS OF A SUBSTRATE

Номер: US20170225994A1
Автор: Buellesfeld Frank, Haselhorst Georg, LANGE Ulrich
Принадлежит: SCHOTT AG

A method for controlling the thickness of a glass ribbon and an article produced thereby are provided. The method includes: providing a glass ribbon by drawing from a melt or redrawing from a preform; predefining a nominal thickness of the glass ribbon; determining the thickness of the glass ribbon over its entire net width; determining at least one deviation of the thickness of the glass ribbon from the predefined nominal thickness; identifying the area of the thickness deviation in the glass ribbon; and heating the area of the at least one thickness deviation in the glass ribbon using a laser, so that the glass ribbon attains the predefined thickness. 1. A method for controlling thickness of a glass ribbon , comprising:{'sub': 'GB', 'providing a glass ribbon by drawing from a melt or redrawing from a preform with a drawing rate (v) and an average thickness (D) in a net portion;'}predefining a nominal thickness of the glass ribbon;determining a thickness of the glass ribbon over an entire net width (B);determining at least one deviation of the thickness from the nominal thickness;identifying an area on the glass ribbon of the at least one deviation; andheating the area using a laser beam to cause the area to attain the nominal thickness, wherein the heating further comprises controlling at least a power of the laser beam, a duration of irradiation of the laser beam, or a wavelength of the laser beam as a function of the thickness,wherein the laser is equipped with a scanning head configured to scan the entire net width of the glass ribbon; and{'sub': GB', 'Las, 'claim-text': {'br': None, 'i': ·k·v', '·B Подробнее

Номер записи: 73
17-08-2017 дата публикации

FIBER OPTIC MANUFACTURING IN SPACE

Номер: US20170233282A1
Автор: Starodubov Dmitry, Volfson Leo
Принадлежит:

Aspects of the embodiments are directed to systems and methods for forming an optical fiber in a low gravity environment, and an optical fiber formed in a low gravity environment. The system can include a preform holder configured to secure a preform; a heating element secured to a heating element stage and residing adjacent the preform holder; a heating element stage motor configured to move the heating element stage; a tension sensor; a spool; a spool tension motor coupled to the spool and configured to rotate the spool; and a control system communicably coupled to the heating element stage motor and the spool tension motor and configured to control the movement of the heating element stage based on a rotational speed of the spool. The optical fiber can include a fluoride composition, such ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN), and can be characterized by an insertion loss in a range from 13 dB/1000 km to 120 dB/1000 km. 1. A system for forming an optical fiber in a low gravity environment , the system comprising:a preform holder configured to secure a preform;a heating element secured to a heating element stage and residing adjacent the preform holder;a heating element stage motor configured to move the heating element stage;a tension sensor;a spool;a spool tension motor coupled to the spool and configured to rotate the spool; anda control system communicably coupled to the heating element stage motor and the spool tension motor and configured to control the movement of the heating element stage based on a rotational speed of the spool.2. The system of claim 1 , further comprising a preform secured in the preform holder claim 1 , wherein the tension sensor is coupled to the preform holder and configured to monitor a tension on the preform.3. The system of claim 2 , wherein the heating element surrounds the preform.4. The system of claim 1 , further comprising a spool translation motor configured to translate the spool along a long axis of the spool.5. The system of ...

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Номер записи: 74
06-11-2014 дата публикации

Multimode optical fiber and method of manufacturing the same

Номер: US20140328565A1
Автор: Itaru Sakabe, Keiko Nishida, Manabu Shiozaki
Принадлежит: Sumitomo Electric Industries Ltd

The present invention relates to a multimode optical fiber which can provide a smooth cut face suitable for fusion splicing between fibers. The multimode optical fiber has at least a core extending along a central axis and having an α-power refractive index profile, and a cladding, and a residual stress distribution in the core along a radial direction from the central axis has a shape with a maximum at a position intersecting with the central axis.

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Номер записи: 75
10-09-2015 дата публикации

OPTICAL FIBER FABRICATION METHOD

Номер: US20150251945A1
Автор: KONISHI Tatsuya, KUWAHARA Kazuya, NAKANISHI Tetsuya
Принадлежит: Sumitomo Electric Industries, Ltd.

An optical fiber manufacturing method includes a drawing step and a slow cooling step. In the slow cooling step, an optical fiber passes through a heating furnace having a temperature which is set such that in at least 70% of a region from a first position at which a glass outer diameter of the optical fiber becomes less than 500% of a final outer diameter to a second position at which a temperature T of the optical fiber becomes 1400° C., an actual temperature of the optical fiber is within ±100° C. of a target temperature Tt(n) for each position n. The target temperature Tt(n) is a temperature at which a fictive temperature Tf(n+1) of a core at a position n+1 determined by calculation using the recurrence formula “Tf(n+1)=T(n)+(Tf(n)−T(n))exp(−Δt(T(n)))” starting from a fictive temperature Tf(0) of the optical fiber at the first position n=0 is lowest. 2. The optical fiber manufacturing method according to claim 1 , whereinat a position where the optical fiber after being formed in the drawing furnace is exposed to gas with a temperature of 500° C. or less, a mean temperature of the optical fiber in a cross-sectional direction is 1650° C. or less.3. The optical fiber manufacturing method according to claim 1 , wherein3σ of variation in a glass outer diameter of the optical fiber in a longitudinal direction is not more than 0.2 μm.4. An optical fiber manufacturing method for manufacturing an optical fiber by drawing an optical fiber preform having a core made of silica glass containing GeO claim 1 , the method comprising:a drawing step including drawing the optical fiber preform into the optical fiber by heating and softening an end of the optical fiber preform in a drawing furnace; anda slow cooling step including causing the optical fiber to pass through a heating furnace having a temperature lower than a heating temperature in the drawing furnace,wherein a temperature of the optical fiber at entry into the heating furnace is greater than or equal to 1400° C. and ...

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Номер записи: 76
01-08-2019 дата публикации

SPUN ROUND CORE FIBER

Номер: US20190235160A1
Автор: Kimmelma Ossi, KOPONEN Joona, YE Changgeng
Принадлежит: nLIGHT, Inc.

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 comprising a mode-propagating region and a plurality of mode-discriminating regions, the mode-propagating region comprising a material having a first index of refraction, the plurality of mode-discriminating regions comprising a second material having a second index of refraction that is different from the first index of refraction, the core comprising a round outer boundary; anda cladding disposed about the outer boundary of the core and extending along the propagation axis;wherein the mode-propagating region comprises a non-circular cross-section circumscribed within the outer boundary of the core; andwherein the mode-discriminating regions are defined by the outer boundary of the core and the non-circular cross-section of the mode-propagating region such that the mode-discriminating regions are enclosed by the material of the mode-propagating region of the core and the cladding.2. The optical waveguide of claim 1 , wherein the mode-propagating region has a polygonally-shaped cross-section comprising a plurality of facets circumscribed within the outer boundary of the core claim 1 , adjacent facets of the plurality of facets intersecting each other to define vertices.3. The optical waveguide of claim 2 , wherein the mode-discriminating regions are defined by areas ...

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Номер записи: 77
01-08-2019 дата публикации

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

Номер: US20190235162A1
Автор: BYREN Robert W., SHKUNOV Vladimir V.
Принадлежит:

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. A method of manufacturing a low latency optical fiber waveguide structure , the method comprising:constructing an all-dielectric first optical fiber preform comprising a first dielectric bulk optical material having a first refractive index and a plurality of regions of a second dielectric material arranged in a lattice pattern and interspersed throughout the first dielectric bulk optical material, the second dielectric material having a second refractive index that is lower than the first refractive index, the plurality of regions of the second dielectric material being of subwavelength size and being cylindrical in shape with circular cross-section;drawing the all-dielectric first optical fiber preform through a fiber draw process to produce a first optical fiber;dividing the first optical fiber into a plurality of first optical fiber segments;constructing a second optical fiber preform from an arrangement of the plurality of first optical fiber segments about a hollow core region;drawing the second optical fiber preform through the fiber draw process to produce a hollow core optical fiber with an all-dielectric optical metamaterial cladding, the hollow core optical fiber being configured to guide optical energy within the hollow core region by total internal reflection at an ...

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Номер записи: 78
01-09-2016 дата публикации

GLASS BASE MATERIAL ELONGATING METHOD AND GLASS BASE MATERIAL ELONGATING APPARATUS

Номер: US20160251254A1
Автор: Otosaka Tetsuya
Принадлежит:

A glass base material elongating method of sequentially feeding rod-like glass base materials hung by a glass base material feeding mechanism into a heating furnace, and pulling a glass rod with a smaller diameter by a pulling chuck at a lower part of the heating furnace, includes: aligning, by an alignment guiding device that guides the glass rod, a guiding center of the alignment guiding device with an axis of the glass rod, the alignment guiding device guiding the glass rod between the heating furnace and the pulling chuck. 1. A glass base material elongating apparatus that extends a rod-like glass base material , and manufactures a glass rod with a smaller diameter , the apparatus comprising:a heating furnace into which a glass base material is fed;a glass base material feeding mechanism that hangs the glass base material to be fed into the heating furnace;a glass rod pulling chuck that pulls a glass rod at a lower part of the heating furnace, the pulling of the glass rod establishing an axis of the glass rod; andan alignment guiding device whose guiding center can be shifted such that the guiding center conforms to the established axis of the glass rod, the alignment guiding device guiding the glass rod between the heating furnace and the pulling chuck.2. The glass base material elongating apparatus according to claim 1 , wherein the alignment guiding device has:an aligning mechanism that aligns the guiding center of the alignment guiding device with the established axis of the glass rod, anda fixing mechanism that fixes the aligning mechanism at a position where the guiding center of the alignment guiding device is aligned with the established axis of the glass rod.3. The glass base material elongating apparatus according to claim 2 , whereinthe aligning mechanism includes a plurality of guiding rollers that abut on and are spaced apart from the glass rod, andthe plurality of guiding rollers moves synchronously.4. The glass base material elongating apparatus ...

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Номер записи: 79
30-08-2018 дата публикации

Production method for multicore optical fiber

Номер: US20180244557A1
Автор: Takuji Nagashima, Tetsuya Nakanishi
Принадлежит: Sumitomo Electric Industries Ltd

There is provided a method for producing a multicore optical fiber while depressurizing holes in a common cladding tube. A production method for a multicore optical fiber includes a preform forming step of forming a common cladding tube having a plurality of holes extending between a first end and a second end, an end-face working step of digging the common cladding tube from the second end to a predetermined depth to forming a third end, a connection step of connecting a glass tube to the second end, an insertion step of inserting core rods into the holes to the third end, a sealing step of sealing the first end, and a drawing step of spinning the multicore optical fiber while depressurizing the holes through the glass tube and combining the common cladding tube and the core rods from the first end.

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Номер записи: 80
30-08-2018 дата публикации

Twisted Glass Canes for Artists

Номер: US20180244558A1
Автор: Fiordimalva Dominick, Herzig Justin, Kishinevski Anatoly
Принадлежит: Elm Tree Entropy, LLC

A glass cane is manufactured by filling a glass tube with a combination of glass structures forming a cross-sectional pattern within the glass tube, to form a preform. The preform is attached to a draw assembly, such as a draw tower. The draw assembly is operated o draw the preform to a reduced-diameter glass cane by passing the preform through a furnace of the draw assembly while pulling the preform or the reduced-diameter glass cane and rotating the preform or the reduced-diameter glass cane. 1. A method of manufacturing twisted glass cane , comprising:filling a glass tube with a combination of glass structures forming a cross-sectional pattern within the glass tube, to form a preform;attaching the preform to a draw assembly; andoperating the draw assembly to draw the preform to a reduced-diameter glass cane by passing the preform through a furnace of the draw assembly while pulling the preform or the reduced-diameter glass cane and rotating the preform or the reduced-diameter glass cane.2. A method in accordance with claim 1 , wherein the step of attaching the preform to the draw assembly comprises connecting an open end of the preform with a vacuum source and wherein the step of operating the draw assembly comprises operating the vacuum pump while performing the step of passing the preform through the furnace while rotating and pulling.3. A method in accordance with claim 2 , wherein the step of connecting the open end of the preform with a vacuum source comprises attaching the open end to a reduction fitting having a connector for connecting with the vacuum source.4. A method in accordance with claim 3 , further comprising securing a coupling around the preform and the reduction fitting and so that at least a partial hermetic seal is formed between the preform and the reduction fitting.5. A method in accordance with claim 2 , wherein the draw assembly is a draw tower claim 2 , and the preform is attached to the draw assembly vertically and the preform is drawn ...

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Номер записи: 81
08-09-2016 дата публикации

Manufacturing irregular-shaped preforms

Номер: US20160257600A1
Автор: Dennis J. Trevor
Принадлежит: OFS FITEL LLC

Irregular-shaped optical fiber preforms and processes for manufacturing such preforms are disclosed. In some embodiments, the irregular-shaped preforms are manufactured by using thin-walled tubes that have irregularities. For some embodiments, these irregularities are varying wall thicknesses. For other embodiments, these irregularities are non-circular cross-sectional shapes. Yet for other embodiments, these irregularities are combinations of varying wall thicknesses and non-circular cross-sectional shapes.

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Номер записи: 82
08-08-2019 дата публикации

GAS RECLAMATION SYSTEM FOR OPTICAL FIBER PRODUCTION

Номер: US20190241459A1
Автор: Carlton Stephen Mitchell, Jewell John Michael, Kladias Nikolaos Pantelis, Vargheese Kochuparambil Deenamma, Zhou Chunfeng
Принадлежит:

A method of producing an optical fiber is provided that includes the steps of flowing a first gas into an optical fiber draw furnace. The first gas is passed through a heated section configured to contain and heat a glass source from which the optical fiber is drawn, passing the first gas through a muffle which defines a capture chamber. A portion of the first gas is removed through at least one reclaim port operatively coupled to the capture chamber. A second gas flows into a gas screen at a rate configured to substantially recover a pressure drop associated with removing the portion of the first gas. 1. A fiber draw furnace , comprising:an upper muffle;a heated section coupled to the upper muffle, the heated section configured to contain and heat a glass source from which an optical fiber is drawn; anda lower extended muffle coupled to the heated section at a first end of the lower extended muffle, the lower extended muffle defining a capture chamber at a second end of the lower extended muffle, wherein the lower extended muffle has an adapter tube extending from the second end toward the first end that is substantially coaxial with the lower extended muffle.2. The fiber draw furnace of claim 1 , wherein the lower extended muffle defines at least one reclaim port proximate the capture chamber.3. The fiber draw furnace of claim 2 , wherein an entrance to the adapter tube is positioned above the at least one reclaim port and the adapter tube has an internal diameter of less than about 1.5 inches.4. The fiber draw furnace of claim 1 , wherein the adapter tube extends from a lower extended muffle outlet.5. The fiber draw furnace of claim 4 , wherein an entrance of the adapter tube comprises a conical shape.6. The fiber draw furnace of claim 5 , wherein the entrance of the adapter tube comprises at least one of a first flange claim 5 , which is substantially coaxial with the adapter tube claim 5 , and a second flange claim 5 , which is perpendicular to the adapter tube ...

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Номер записи: 83
23-09-2021 дата публикации

Manufacturing method for optical fiber and manufacturing apparatus for optical fiber

Номер: US20210292223A1
Автор: Tsukasa Hosokawa
Принадлежит: Fujikura Ltd

A manufacturing method for an optical fiber, includes: drawing, while heating in a heating furnace, a lower end of an optical fiber preform that is to be an optical fiber having a core consisting of silica glass containing a rare earth element compound. The heating furnace has a temperature profile in which a temperature of the heating furnace increases to a maximum temperature Tmax and then decreases from an upstream side of the heating furnace toward a downstream side of the heating furnace. The temperature profile has a changing point at which the temperature decreases more steeply on the downstream side from a position where the maximum temperature Tmax is reached. At the maximum temperature, a temperature of the silica glass is higher than or equal to a glass transition temperature and the silica glass is in a single phase.

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Номер записи: 84
06-09-2018 дата публикации

Rod bundle and method of manufacturing optical fiber

Номер: US20180251391A1
Автор: Ryohei FUKUMOTO
Принадлежит: Fujikura Ltd

A rod bundle includes a core-clad rod that includes a core rod and a cladding layer that covers the core rod, a plurality of first filling rods disposed around the core-clad rod to be in contact with the core-clad rod, and two second filling rods that are disposed opposite to each other and interposing the core-clad rod therebetween to be distant from the core-clad rod and form first spaces with the core-clad rod. The rod bundle also includes a pair of second spaces that are next to the core-clad rod are formed to interpose the core-clad rod therebetween in a direction perpendicular to a direction in which the two second filling rods are opposite to each other and, in a transverse plane, an area of each of the first spaces is more than an area of each of second spaces.

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Номер записи: 85
06-09-2018 дата публикации

FIBER OPTIC MANUFACTURING IN SPACE

Номер: US20180251392A1
Автор: Starodubov Dmitry, Volfson Leo
Принадлежит:

Aspects of the embodiments are directed to systems and methods for forming an optical fiber in a low gravity environment, and an optical fiber formed in a low gravity environment. The system can include a preform holder configured to secure a preform; a heating element secured to a heating element stage and residing adjacent the preform holder; a heating element stage motor configured to move the heating element stage; a tension sensor; a spool; a spool tension motor coupled to the spool and configured to rotate the spool; and a control system communicably coupled to the heating element stage motor and the spool tension motor and configured to control the movement of the heating element stage based on a rotational speed of the spool. The optical fiber can include a fluoride composition, such ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN), and can be characterized by an insertion loss in a range from 13 dB/1000 km to 120 dB/1000 km. 1. A system for forming an optical fiber in a low gravity environment , the system comprising:a preform holder configured to secure a preform;a heating element secured to a heating element stage and residing adjacent the preform holder;a heating element stage motor configured to move the heating element stage;a tension sensor;a spool;a spool tension motor coupled to the spool and configured to rotate the spool; anda control system communicably coupled to the heating element stage motor and the spool tension motor and configured to control the movement of the heating element stage based on a rotational speed of the spool.2. The system of claim 1 , further comprising a preform secured in the preform holder claim 1 , wherein the tension sensor is coupled to the preform holder and configured to monitor a tension on the preform.3. The system of claim 2 , wherein the heating element surrounds the preform.4. The system of claim 1 , further comprising a spool translation motor configured to translate the spool along a long axis of the spool.5. The system of ...

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Номер записи: 86
07-09-2017 дата публикации

APPARATUS AND METHOD FOR PREFORM OR TUBE DRAWING BASED ON ITS VISCOSITY

Номер: US20170254733A1
Автор: Beavers, Chang Kai Huei, FATTAL Georges Levon, GREEN Evan P., JR. James E., MA Qiulin
Принадлежит:

Methods for preform and tube draw based on controlling forming zone viscosity determined by calculating a holding force exerted by the glass component in the forming zone on the strand being drawn below. The holding force may be calculated by determining a gravitational force applied to the strand and a pulling force applied to the strand by a pulling device, where the holding force is equal to the opposite of the algebraic sum of the gravitational and pulling forces. The holding force may also be calculated by measuring a stress-induced birefringence in the strand at a point between the forming zone and the pulling device, determining an amount of force applied to the strand at the point corresponding to the birefringence, and calculating the holding force by correcting the amount of force for a gravitational effect of the weight of the strand between the forming zone and the point. 1. A method of measuring the viscosity of a forming region of a glass preform or tubing fabrication process , wherein the fabrication process comprises heating a bulk glass component in a heating region , drawing a strand from the forming region of the bulk glass component , and using a pulling device to control the rate at which the strand is drawn , the method comprising:calculating a holding force applied to the strand by the forming region, andcorrelating the holding force with the viscosity of the forming region.2. The method of claim 1 , wherein the holding force is used to control the glass preform or tubing fabrication process by adjusting the heating of the bulk glass component based on the holding force.3. The method of claim 1 , wherein calculating the holding force comprises:determining a gravitational force applied to the strand; anddetermining a pulling force applied to the strand by the pulling device,wherein the sum of the holding force, the gravitational force, and the pulling force equals zero.4. The method of claim 3 , wherein determining the gravitational force ...

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Номер записи: 87
24-09-2015 дата публикации

Optical Fibers Produced in Microgravity Environments and Method of Production

Номер: US20150266767A1
Автор: Richard L. Glover, William F. Seng
Принадлежит: MASTERSON INDUSTRIES LLC

Optical fibers with previously unattainable characteristics and the method of producing the same are disclosed and claimed herein. Specifically, the application discloses and claims a method to produce ZBLAN, Indium Fluoride, Germanate and Chalcogenide optical fibers and other similar optical fibers in a microgravity environment. The resulting optical fibers have unique molecular structures not attainable when optical fibers with the identical chemical composition are produced in a standard 1 gravity environment. The method of the invention requires a novel draw tower and modified preform, which are specifically designed to operate in microgravity environments. A lead wire is inserted into the preform that, when wound onto a spool in the draw tower, causes a fiber to form. The pull rate of the lead wire controls the diameter of the fiber.

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Номер записи: 88
15-09-2016 дата публикации

Optical fiber base material machining method

Номер: US20160264450A1
Автор: Hideki Fujii, Takashi KOSHIGAI
Принадлежит: Shin Etsu Chemical Co Ltd

An optical fiber base material machining method for forming spindle-shaped portions at ends of the optical fiber base material by severing the optical fiber base material after reducing an outer diameter of the optical fiber base material to a predetermined target outer diameter at a predetermined machining position, comprising: reducing the outer diameter to a predetermined intermediate outer diameter between the outer diameter before the machining and the target outer diameter at the machining position; flame polishing a surface of the optical fiber base material in a region including the machining position; and further reducing the outer diameter of the optical fiber base material.

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Номер записи: 89
15-08-2019 дата публикации

FIBER COATING COMPOSITIONS WITH HIGH CURE SPEED

Номер: US20190249034A1
Автор: Bookbinder Dana Craig, Chen Yangbin, Tandon Pushkar, Tandon Ruchi, YANG Bin
Принадлежит:

The present disclosure provides coating compositions and cured products formed from the coating compositions. The cured products can be formed at high cure speeds from the coating compositions and feature low Young's modulus, high tear strength, and/or high tensile toughness. The cured products can be used as primary coatings for optical fibers. The primary coatings provide good microbending performance and are resistant to defect formation during fiber coating processing and handling operations. The coating compositions include an oligomer, an alkoxylated monofunctional acrylate monomer, and preferably, an N-vinyl amide compound. 2. The composition of claim 1 , wherein the group Rcomprises a 4 claim 1 ,4′-methylenebis(cyclohexyl) group.3. The composition of claim 1 , wherein the group Ris a propylene group.4. The composition of claim 1 , wherein x is in the range from 80-140.5. The composition of claim 1 , wherein the di-adduct compound is present in the oligomer in an amount greater than 3.0 wt %.6. The composition of claim 1 , wherein the oligomer is present in the composition in an amount greater than 40 wt %.8. The composition of claim 7 , wherein the group Ris an alkylene group with 3-6 carbon atoms.10. The composition of claim 9 , wherein q is in the range from 1-4.11. The composition of claim 1 , wherein the monomer is present in the composition in an amount greater than 45 wt %.12. The composition of claim 1 , further comprising an N-vinyl amide compound.13. The composition of claim 1 , further comprising a photoinitiator.14. A cured product of the composition of .15. The cured product of claim 14 , wherein the cured product has a Young's modulus of less than 1.0 MPa and a tensile toughness greater than 900 J/m claim 14 , when configured as a cured film having a thickness between 0.0030″ and 0.0035″.16. The cured product of claim 14 , wherein the cured product has a tear strength greater than 35 J/mand a tensile toughness greater than 900 J/m claim 14 , ...

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Номер записи: 90
06-08-2020 дата публикации

RADIATION PUMPED HEATER/HEATING ELEMENT

Номер: US20200247711A1
Автор: Goldring Sharone
Принадлежит: Soreq Nucelar Research Center

A radiation pumped heater includes a ceramic substrate which is heated by a laser beam to a steady state temperature. An optical fiber is heated by conduction and radiation emitted from the ceramic substrate. 1. Apparatus comprising:a radiation pumped heater comprising a ceramic substrate which is heated by a laser beam to a steady state temperature; andan optical fiber which is heated by conduction and radiation emitted from the ceramic substrate.2. The apparatus according to claim 1 , comprising holders for holding said optical fiber claim 1 , said holders being movable to draw a heated portion of said fiber to a reduced diameter.3. The apparatus according to claim 2 , wherein said holders move in the same direction.4. The apparatus according to claim 2 , wherein said holders move in different directions.5. A method for processing an optical fiber comprising:heating a portion of an optical fiber with a radiation pumped heater, the heater comprising a ceramic substrate which is heated by a laser beam to a steady state temperature, and wherein said optical fiber is heated by conduction and radiation emitted from the ceramic substrate; anddrawing the optical fiber to reduce a diameter of the heated portion.6. The method according to claim 5 , comprising holding said optical fiber on opposite sides of the heated portion claim 5 , and moving said holders to draw the heated portion of said fiber to the reduced diameter.7. The method according to claim 6 , wherein said holders move in the same direction.8. The method according to claim 6 , wherein said holders move in different directions. The present invention relates generally to heating elements, and particularly to steady-state heaters useful in certain processes, such as reducing diameters of optical fibers.Micro heat sources play a major role in fiber optics and glass processing. In general they need to provide a steady, clean and controllable heating zone at temperatures that approach 2000° C.At present, there are ...

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Номер записи: 91
28-10-2021 дата публикации

PARTICLE EXHAUST APPARATUS FOR OPTICAL FIBER DRAW FURNACE

Номер: US20210331963A1
Автор: CHEN Guoqiang, Liu Zhi Ming
Принадлежит:

According to one embodiment of the present disclosure, a reclaim cylinder includes: a single housing () coupled to a fiber draw furnace system, the housing defining a reclaim chamber , a plurality of gas reclaim ports () spaced equidistant from each other and tangentially coupled to the housing, a gas sampling port () tangentially or perpendicularly coupled to the housing, and a particle sampling port () tangentially or perpendicularly coupled to the housing. 1. A reclaim cylinder , comprising:{'b': 60', '64, 'a single housing () coupled to a fiber draw furnace system, the housing defining a reclaim chamber ();'}{'b': '68', 'a plurality of gas reclaim ports () spaced equidistant from each other and tangentially coupled to the housing;'}{'b': '52', 'a gas sampling port () tangentially or perpendicularly coupled to the housing, and'}{'b': '54', 'a particle sampling port () tangentially or perpendicularly coupled to the housing.'}2. The reclaim cylinder of claim 1 , wherein the fiber draw furnace system comprises:{'b': 22', '22', '22', '38, 'a heated section () having a first end (A) and a second end (B), wherein the heated section is configured to hold an optical fiber preform ();'}{'b': '14', 'an upper gas inlet () coupled to the first end of the heated section, wherein the upper gas inlet is configured to flow a first gas into the heated section;'}{'b': 30', '30', '30, 'a lower extended muffle () having a first end (A) and a second end (B);'}{'b': '34', 'a lower gas inlet () coupled to the second end of the lower extended muffle configured to allow a gas to flow into the lower extended muffle; and'}{'b': '26', 'wherein the reclaim cylinder () is coupled to the lower extended muffle between the first end of the lower extended muffle and the second end of the heated section.'}3. The reclaim cylinder of claim 1 , wherein the housing of the reclaim cylinder defines a first end coupled to the heated section and a second end coupled to the first end of the lower extended ...

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Номер записи: 92
22-08-2019 дата публикации

LOW ATTENUATION OPTICAL FIBER

Номер: US20190256400A1
Автор: Bookbinder Dana Craig, Li Ming-Jun, Reding Bruce Warren, Tandon Pushkar
Принадлежит:

An optical fiber with low attenuation is provided. The fiber is produced under conditions that reduce fictive temperature. Processing includes maintaining the fiber at temperatures at or near the glass transition temperature (T) for an extended period of time. For silica-based fibers, the preferred temperatures are temperatures between 1000° C. and 1700° C. The extended residence times are achieved in a continuous fiber manufacturing process by increasing the path length of the fiber through a processing region maintained at temperatures between 1000° C. and 1700° C. The increased path length is achieved by including one or more fluid bearing devices in the processing region. The extended residence time in the processing region allows the structure of the glass fiber to relax more completely and to more closely approach the equilibrium state. The more relaxed glass structure leads to a lower fictive temperature and provides fibers with lower attenuation. 1. An optical fiber produced by a method comprising:directing an optical fiber in a first direction of conveyance, said optical fiber having a first temperature along said first direction of conveyance, said first temperature being between 1000° C. and 1700° C.; andredirecting said optical fiber from said first direction of conveyance to a second direction of conveyance using a series of at least two heated fluid bearing devices, said optical fiber having a second temperature upon said redirecting to said second direction of conveyance, said second temperature being between 1000° C. and 1700° C.;wherein said optical fiber is maintained at said first temperature and said second temperature for a combined time greater than 0.5 sec; andwherein a temperature of each one of said at least two heated fluid bearing devices is at least 500° C.2. The optical fiber of claim 1 , wherein said optical fiber has an attenuation less than 0.17 dB/km at 1550 nm.3. The optical fiber of claim 1 , wherein said optical fiber has an ...

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Номер записи: 93
20-09-2018 дата публикации

NOVEL COOLING SYSTEM FOR OPTICAL FIBER DRAWING

Номер: US20180265396A1
Автор: CAO Shanshan, LIU Zhizhong, SUN ZHICHENG, Wang Zhen, ZHANG Haitao
Принадлежит: ZHONGTIAN TECHNOLOGY FIBRE OPTICS CO., LTD

A cooling system for optical fiber drawing is used for decreasing the temperature of an optical fiber before coating, avoiding the occurrence of bubbles in a coating, ensuring a stable coating state of the optical fiber, and reducing the amount of helium gas used, being suitable for high-speed drawing. The cooling system consists of shutters of the cooling pipe; a helium gas guiding device, a cooling pipe body, a cooling water circulation and cooling device, a coating diameter control system, a cooling water pipe and a gas pipe. Several single-section cooling pipes are connected to each other by the gas intake connection devices. The outer wall of each segment of the cooling pipes is covered with a polystyrene foam thermal insulating layer, and the helium gas guiding device guides the gas within the pipe at a suitable guiding flow rate to achieve the optimal cooling effect. 1. A novel cooling system for optical fiber drawing , comprising:a cooling pipe shutter, a helium gas drainage device, a cooling pipe body, a cooling water circulation and cooling device, a coating diameter meter, a coating diameter control system, a cooling water pipe and a gas pipe; whereinan upper end of a lower shutter of a cooling pipe is installed with a helium gas drainage plug, an upper of the helium gas drainage plug is connected to the cooling pipe body, and a coating and curing device are provided below the cooling pipe, the helium gas drainage plug is connected to a first mass flow meter and a drainage pump through the gas pipe in sequence;the cooling pipe body comprises a single-section cooling pipe and a helium gas intake device, the cooling pipe body is composed of three to six of the single-section cooling pipes, the single-section cooling pipes are connected to each other end to end through the helium gas intake device, an upper end and a lower end of the single-section cooling pipe are provided respectively with a water hole, two adjacent water holes between the single-section ...

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Номер записи: 94
11-12-2014 дата публикации

METHOD OF FORMING A WEB FROM FIBROUS MATERIALS

Номер: US20140364031A1
Автор: Gaul David J., Haley Glenn, Pellegrin Michael T.
Принадлежит:

Mechanically entangled, in-line formed, packs of glass fibers are mechanically entangled differently at different portions of the web. In one exemplary embodiment, in-line formed glass fibers are mechanically entangled by any combination of two or more entangling devices. The two or more entangling devices may be the same or different. In one exemplary embodiment, the glass fibers are mechanically entangled from at least a first side of a web by a first entangling device and are mechanically entangled from a second side of the web by a second entangling device. 1. A continuous method for forming a pack of glass fibers comprising:melting glass;processing the molten glass to form glass fibers;accumulating glass fibers to form a binderless web;mechanically entangling the fibers of the web with a first entanglement device that acts on the web from at least a first side of the web;mechanically entangling the fibers of the web with a second entanglement device that acts on the web from at least a second side of the web.2. The method of wherein the first entangling device acts on the web from both sides of the web.3. The method of wherein the second entangling device acts on the web from only a top side of the web.4. The method of wherein the first and second entangling devices provide more entanglement of the fibers on the first side than on the second side of the web.5. The method of wherein the first and second entangling devices provide different types of entanglement at different areas of the web.6. The method of wherein the first and second entangling devises provide different types of entanglement at different depths of the web.7. The method of wherein at least one of the first and second entangling devices align at least a portion of the fibers of the web more with a direction of travel of the web than in the direction of the width of the web and more than in the direction of the thickness of the web.8. The method of wherein the first entangling device is ...

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Номер записи: 95
08-10-2015 дата публикации

Manufacturing method and manufacturing apparatus of optical fiber

Номер: US20150285994A1
Автор: Kenji Okada
Принадлежит: Fujikura Ltd

A manufacturing method of an optical fiber includes: heating and melting an optical fiber preform; drawing a bare optical fiber from a heated and melted portion of the optical fiber preform; cooling the bare optical fiber drawn from the optical fiber preform; forming a coating layer on a surface of the cooled bare optical fiber; obtaining an optical fiber by curing the coating layer; adding torsion to the optical fiber by transmitting the torsion up to the heated and melted portion through the bare optical fiber from the optical fiber so that spin is applied to the bare optical fiber; and winding the optical fiber.

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Номер записи: 96
20-08-2020 дата публикации

LIGHT DIFFUSING OPTICAL FIBERS HAVING UNIFORM ILLUMINATION ALONG DIFFUSION LENGTHS AND METHODS OF FORMING THE SAME

Номер: US20200264359A1
Автор: Logunov Stephan Lvovich
Принадлежит:

A light diffusing optical fiber includes a core, a cladding surrounding the core, an outer surface, and a plurality of scattering structures positioned within the core, the cladding, or both the core and the cladding. The plurality of scattering structures are configured to scatter guided light towards the outer surface, such that light including a wavelength of from about 450 nm to about 650 nm diffusing through the outer surface along a diffusion length of the light diffusing optical fiber includes a spectral attenuation percent relative range of about 15% or less. 1. A light diffusing optical fiber comprising:a core;a cladding surrounding the core;an outer surface; anda plurality of scattering structures positioned within the core, the cladding, or both the core and the cladding, wherein the plurality of scattering structures are configured to scatter guided light towards the outer surface, such that light comprising a wavelength of from about 450 nm to about 650 nm diffusing through the outer surface along a diffusion length of the light diffusing optical fiber comprises a spectral attenuation percent relative range of about 15% or less.2. The light diffusing optical fiber of claim 1 , wherein the spectral attenuation percent relative range of the light diffusing through the outer surface along the diffusion length of the light diffusing optical fiber comprises about 8% or less.3. The light diffusing optical fiber of claim 1 , wherein the spectral attenuation percent relative range of the light diffusing through the outer surface along the diffusion length of the light diffusing optical fiber comprises about 3% or less.4. The light diffusing optical fiber of claim 1 , wherein a correlated color temperature of the light diffusing through the outer surface along the diffusion length of the light diffusing optical fiber comprises from about 2500 K to about 8000 K.5. The light diffusing optical fiber of claim 1 , wherein a correlated color temperature of the light ...

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Номер записи: 97
05-10-2017 дата публикации

Optical fiber preform and method of manufacturing optical fiber

Номер: US20170283301A1
Автор: Mitsuhiro Kawasaki
Принадлежит: Furukawa Electric Co Ltd

An optical fiber preform includes: a columnar portion having an approximately constant radius of r; and a taper portion located adjacent to the columnar portion in a lengthwise direction and having a radius decreasing along the lengthwise direction. The taper portion includes: a first taper portion including a portion having a radius varying between 0.9r and 0.6r; and a second taper portion including a portion having a radius varying between 0.4r and 0.15r. A diameter of the first taper portion in the portion having the radius varying between 0.9r and 0.6r decreases so as to form a maximum angle θ1 between 40 degrees and 60 degrees with respect to the columnar portion, a diameter of the second taper portion in the portion having the radius varying between 0.4r and 0.15r decreases so as to form an average angle θ2 between 5 degrees and 30 degrees with respect to a central axis in the lengthwise direction, and a volume of the taper portion is smaller than or equal to 45% of a volume of a column having a same outer diameter as a maximum outer diameter of the taper portion and having a same length as the taper portion.

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Номер записи: 98
04-10-2018 дата публикации

METHOD OF MANUFACTURING COUPLED-CORE MULTI-CORE FIBER

Номер: US20180282200A1
Автор: NAGASHIMA Takuji, NAKANISHI Tetsuya
Принадлежит: Sumitomo Electric Industries, Ltd.

A coupled-core multi-core fiber in which an inter-core distance is stabilized is manufactured. A method of manufacturing a coupled-core multi-core fiber includes forming a second cladding base material by depositing glass particulates on an outer periphery of a first cladding base material and sintering the glass particulates. The first cladding base material has a hydroxyl group concentration that is less than or equal to 10 ppb; obtaining a ground rod by grinding an outer periphery of the second cladding base material; and forming holes in the first cladding base material in the ground rod, inserting a core base material into each of the holes, and obtaining an assembly. 1. A method of manufacturing a coupled-core multi-core fiber , comprising:forming a second cladding base material by depositing glass soot on an outer periphery of a first cladding base material and sintering the glass soot, the first cladding base material having a hydroxyl group concentration that is less than or equal to 10 ppb;obtaining a ground rod by grinding an outer periphery of the second cladding base material;forming holes in the first cladding base material in the ground rod; andobtaining an assembly by inserting a core base material into each of the holes.2. The method of manufacturing a coupled-core multi-core fiber according to claim 1 , further comprising:drawing the assembly.3. The method of manufacturing a coupled-core multi-core fiber according to claim 2 , whereinthe core base material contains an alkali metal.4. The method of manufacturing a coupled-core multi-core fiber according to claim 1 , further comprising:after cleaning an interface between the first cladding base material and the core base material of the assembly, obtaining an optical fiber preform by heating and integrating the first cladding base material and the core base material; anddrawing the optical fiber preform.5. The method of manufacturing a coupled-core multi-core fiber according to claim 2 , whereinthe ...

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Номер записи: 99
22-10-2015 дата публикации

PROCESSING METHOD OF GLASS BASE MATERIAL FOR OPTICAL FIBER

Номер: US20150299023A1
Автор: Fujii Hideki
Принадлежит:

Provided is a method of processing a glass base material for optical fiber in which the glass base material for optical fiber is elongated to reduce a diameter thereof until reaching a final elongation diameter and form a completed base material. The method includes measuring an outer diameter distribution that includes an outer diameter of the glass base material for optical fiber; setting an effective region; calculating a target elongation diameter that is larger than the final elongation diameter and less than an average diameter of the effective region, and elongating the glass base material for optical fiber until reaching the target elongation diameter; and after reaching the target elongation diameter, further elongating the glass base material for optical fiber until reaching the final elongation diameter. 1. A method of processing a glass base material for optical fiber in which the glass base material for optical fiber is elongated to reduce a diameter thereof until reaching a final elongation diameter and form a completed base material , the method comprising:before elongating the glass base material for optical fiber, measuring an outer diameter distribution that includes an outer diameter of the glass base material for optical fiber at a plurality of measurement points in a longitudinal direction of the glass base material for optical fiber;setting an effective region that is continuous in the longitudinal direction in the glass base material for optical fiber, based on the measured outer diameter;calculating a target elongation diameter that is larger than the final elongation diameter and less than an average diameter of the effective region of the glass base material for optical fiber that is calculated based on the measured outer diameter, and elongating the glass base material for optical fiber until reaching the target elongation diameter; andafter reaching the target elongation diameter, further elongating the glass base material for optical ...

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Номер записи: 100