ОДНОМОДОВЫЙ ВОЛОКОННО-ОПТИЧЕСКИЙ ВОЛНОВОД (ВАРИАНТЫ) И СПОСОБ ИЗГОТОВЛЕНИЯ ОДНОМОДОВОГО ВОЛОКОННО-ОПТИЧЕСКОГО ВОЛНОВОДА

Одномодовый волоконно-оптический волновод имеет периодические возмущения в сердцевине для создания двойного лучепреломления, которое обеспечивает смешивание поляризационных мод проходящего по волноводу света. В сердцевину также введены возмущения для управления полной дисперсией. В результате полная дисперсия в заранее заданных сегментах волновода меняет знак так, что алгебраическая сумма произведений полной дисперсии на длину равна заранее выбранной величине. Два различных типа возмущения сердцевины служат для управления как дисперсией поляризационной моды, так и полной дисперсией. Обеспечена низкая дисперсия и малое затухание. 3 с. и 11 з.п.ф-лы, 4 ил.

ОПТИЧЕСКОЕ ВОЛОКНО С МОДУЛИРУЕМЫМ СКРУЧИВАНИЕМ ДЛЯ УМЕНЬШЕНИЯ ДИСПЕРСИИ ПОЛЯРИЗАЦИОННЫХ МОД (ВАРИАНТЫ), СПОСОБ (ВАРИАНТЫ) И УСТРОЙСТВО ДЛЯ ЕГО ИЗГОТОВЛЕНИЯ, СОВОКУПНОСТЬ ОПТИЧЕСКИХ ВОЛОКОН

Техническая задача изобретения - уменьшение дисперсии поляризационных мод в одномодовом оптическом волокне. Указанная задача обеспечивается за счет скручивания волокна в процессе его вытягивания согласно функции скручивания, имеющей достаточное содержание гармоник для получения малого уровня дисперсии поляризационных мод в серийно выпускаемых волокнах с неизвестными заранее длинами биений, включая длины биений в различных частях волокна. Рассмотренные функции скручивания используют определенные резонансы передачи энергии между поляризационными модами для достижения существенного уменьшения дисперсии поляризационных мод в широком диапазоне длин биений. Примеры подходящих функций скручивания включают частотно- и амплитудно-модулированные синусоидальные колебания. 11 с. и 18 з.п. ф-лы, 17 ил.

OPTISCHE FASER MIT NIEDRIGEN POLARISATIONSMODENDISPERSION SOWIE DÄMPFUNG UND IHRE HERSTELUNGSVERFAHREN

GLAS-VORFORM FUER EINE DISPERSIONSVERSCHOBENE OPTISCHE EINZELMODENFASER UND VERFAHREN ZU DEREN HERSTELLUNG.

Optische Faser

OPTICAL FIBRES

PROCEDURE FOR THE PRODUCTION OF A FIBER-OPTIC WAVE LEADER FOR A SENSOR

OPTICAL FIBER CONNECTION WITH LOW POLARIZATION INTERMODE DISPERSION (PMD) AND MANUFACTURING PROCESS FOR IT

PROCEDURE AND DEVICE FOR THE REGULATION OF THE POLARIZATION INTERMODE DISPERSION OF AN OPTICAL FIBER DURING PULLING

OPTICAL FIBER WITH LOW POLARIZATION INTERMODE DISPERSION AS WELL AS ABSORPTION AND YOUR HERSTELUNGSVERFAHREN

PRODUCTION OF OPTICAL FIBERS.

PROCEDURE FOR MANUFACTURING GATHERING MOLDS FOR OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE WITH A SEGMENT CORE

Method of making optical fiber preform by chemical vapour deposition

WIDEBAND, MULTI-CORE DISPERSION COMPENSATION FIBER

Method of having optical fiber having depressed index core region

Method and apparatus for introducing controlled spin in optical fibers

Method of manufacturing optical fiber

Fiber for reduced polarization effects in amplifiers

Dispersion-shifted fiber

Method and apparatus for twisting a coated optical fiber during drawing from a preform

OPTICAL FIBER AND NONLINEAR OPTICAL FIBER, OPTICAL AMPLIFIER AND WAVELENGTH CONVERTER USING THE SAME, AND METHOD OF MAKING OPTICAL FIBER

Employed as a structure of a highly nonlinear optical fiber (nonlinear optical fiber) is a double-cladding structure in which a first cladding region 20 and a second cladding region 30 are disposed on the outer periphery of a core region 10. Since the double-cladding structure is employed, the cutoff wavelength .lambda.c can sufficiently be shortened even when, in order to increase the nonlinear coefficient .gamma., the concentration of GeO2 added into the core is enhanced so as to raise the nonlinear refractive index, or the relative refractive index difference between the core and cladding is increased so as to reduce the effective area A eff. This realizes an optical fiber or nonlinear optical fiber shortening its cutoff wavelength while having a sufficient nonlinearity, an optical amplifier and wavelength converter using the same, and a method of making an optical fiber.

A MULTIMODE FIBER AND METHOD FOR FORMING IT

A multimode optical fiber (10) having a first laser bandwidth greater than 220MHz.km in the 850nm window, a second laser bandwidth greater than 500MHz.km in the 850nm window, and a second OFL bandwidth of at least 500MHz.km in the 300nm window is disclosed. The multimode fiber is capable of operating telecommunication systems employing both LED power sources and high power laser sources. Method of making and testing the multimode optical fiber are also disclosed.

DISPERSION COMPENSATING DEVICES AND SYSTEMS

Disclosed is a family of dispersion compensating optical fibers that are adapted for use with conventional single-mode transmission fibers that are optimized for zero dispersion operation at a wavelength in the range from 1290 nm to 1330 nm to form a transmission link suitable for low dispersion operation in the 1520-1565 nm wavelength window. The dispersion compensating fibers are capable of providing a dispersion more negative than -20 ps/nm-km and attenuation less than 1 dB/km at wavelengths in the 1520-1565 nm region. Certain of the dispersion compensating fibers also exhibit a dispersion versus wavelength relationship having a negative slope in the 1520-1565 nm region, to compensate for the dispersion versus wavelength slope of the trandsmission fiber. The dispersion compensating fiber can be advantageously combined with a fiber amplifier to form a compensator that is adapted to overcome attenuation introduced into the system by the dispersion compensating fiber. In one embodiment, ...

COMPRISING MANUFACTORING PROCESS Of an OUTLINE FOR FIBEROPTICS OF the LONGITUDINAL GRADATIONS

MANUFACTORING PROCESS Of a MOBILE FIBEROPTIC OF DISPERSION PRESENTING a PROFILE Of INDEX OF REFRACTION OUT OF SOFT ANNULAR RING

DISPOSITIF D'ECHAUFFEMENT D'UNE ZONE ANNULAIRE SUPERFICIELLE D'UN OBJET FILIFORME

L'INVENTION A POUR OBJET UN DISPOSITIF COMPRENANT UN LASER A DIOXYDE DE CARBONE DONT LE FAISCEAU 2 EST DIRIGE VERS UN MIROIR 3 SPERIQUE PUIS REFLECHI SUR UN MIROIR ELLIPSOIDAL 4 POUR CONCENTRER L'ENERGIE DE CE LASER SUR UN ANNEAU SUPERFICIEL D'UN OBJET FILIFORME 1. APPLICATION, NOTAMMENT, A LA FABRICATION DE FIBRES OPTIQUES CONSERVANT LA POLARISATION CIRCULAIRE.

PROCEDE DE FABRICATION D'UNE FIBRE CONSERVANT LA POLARISATION CIRCULAIRE ET DISPOSITIF METTANT EN OEUVRE CE PROCEDE

L'INVENTION CONCERNE UN PROCEDE PERMETTANT DE REALISER UNE FIBRE CONSERVANT LA POLARISATION CIRCULAIRE ET UN DISPOSITIF POUR LA MISE EN OEUVRE DE CE PROCEDE. CE PROCEDE DE REALISATION CONSISTE, LORS DE L'ETIRAGE ET DE LA TORSION DE LA FIBRE A PARTIR D'UNE SOURCE 8 DE MATIERE FORMABLE, A REFONDRE EN SUPERFICIE UNE PARTIE DE VOLUME DE CETTE FIBRE 1 DANS UNE ZONE OU CELLE-CI EST SOUMISE A DES CONTRAINTES DE TORSION. L'INVENTION S'APPLIQUE NOTAMMENT A LA FABRICATION DE FIBRES OPTIQUES.

DEVICE Of HEATING Of a SURFACE ANNULAR ZONE Of a THREAD-LIKE OBJECT

METHOD FOR REALIZATION OF PREFORM FIBEROPTIC HAS

L'invention concerne le domaine des procédés de réalisation de préforme à fibre optique par dépôt de couches. C'est un procédé de réalisation de préforme à fibre optique par dépôt de couches, le procédé étant de type FCVD, la fibre optique ayant d'une part un coeur comprenant au moins une partie centrale, une gaine intérieure et un anneau et d'autre part une gaine extérieure, la fibre optique étant de type DSF ou DCF, les couches de la préforme correspondant à la gaine intérieure et à l'anneau de la fibre optique présentant un taux de phosphore en poids compris entre 0% et 0,1%.

SYSTEM CUTTER the MODAL DISPERSION OF POLARIZATION Of a Fiberoptic

L'invention concerne un système anti-PMD comprenant, une poulie (1) anti-PMD sur laquelle une fibre optique (4) est destinée à rouler et qui est rotative autour d'un axe (ar) de rotation, au moins deux dispositifs de guidage (2, 3) de fibre optique situés de part et d'autre de la poulie (1) anti-PMD, l'axe (ar) de rotation de la poulie (1) anti-PMD étant fixe, le seul degré de liberté de la poulie (1) anti-PMD étant la rotation autour de l'axe (ar) de rotation de la poulie (1) anti-PMD, au moins l'un des dispositifs de guidage (2, 3) étant mobile en translation selon une direction de translation (dt) non orthogonale à l'axe (ar) de rotation de la poulie (1) anti-PMD.

Method of providing spin in an optical fiber

METHOD FOR DRAWING OPTICAL FIBER BY CONTROLLING ASYMMETRICAL AMPLITUDE OF SPINS

PURPOSE: Provided is a method for drawing optical fibers with a uniform period of spin function to minimize polarization mode dispersion of optical fibers. CONSTITUTION: The optical fiber drawing method comprises the steps of: melting and drawing optical fibers by heating the ends of optical fiber preforms; forming the primary spinning by turning with a planned angle to the direction perpendicular to the drawing direction; forming the secondary spinning by applying additional turning to the primary spinning according to the fixed spin function, expressed by the formula, S(z)= α0sin(2πf0) + nα (S(z): spin function, α: spin amplitude, f : frequency, and α: integer). © KIPO 2004 ...

link optical fiber, optical cable line, and, methods to obtain a fiber optic link, to produce an optical cable, and to obtain an optical cable line

Fiber optical waveguide simply oriented in dispersion and process of making same

Fibra de guia de onda ótica de modo simples orientada em dispersão e processo de fabricação da mesma

método para produção de uma fibra óptica tendo baixa dispersão de modo de polarização.

OPTICAL FIBER TWISTING DEVICE, METHOD OF MANUFACTURING OPTICAL FIBER, AND OPTICAL FIBER

An optical fiber twisting device capable of stably covering a bare optical fiber by preventing the optical fiber from being swung during drawing. The optical fiber twisting device comprises a twisting roller (22) twisting the molten portion of an optical fiber base metal positioned on the upstream side of the optical fiber by adding twist to the optical fiber and a support part (21) pivotally supporting the twisting roller (22). The accuracy of the outer peripheral part of the twisting roller (22) in the state of forming a twisting roller device (25) is 15 μm or less.

APPARATUS FOR APPLYING SPIN TO OPTICAL FIBER AND OPTICAL FIBER MANUFACTURING METHOD AND APPARATUS USING THE SAME

A method of applying spin to a coated optical fiber to be rotated on its longitudinal axis so that the optical fiber has an ultra-low PMD (Polarization Mode Dispersion) includes the steps of: guiding the coated optical fiber so as not to be deviated from a certain range off a drawing axis at a lower end of an optical fiber coating point; giving torque to the optical fiber by contacting the coated optical fiber with a driving roller which vibrates on the center of an axis substantially parallel to a drawing direction at a lower end of the guiding point; and adjusting an amplitude (A) of the driving roller and a distance (l) between the guiding point and the vibrating point so as to control an angle (Θ) between the vibrating optical and the drawing axis. This makes it possible to control a spin rate (spins/m) of the optical fiber generated by rotation.

Method of fabricating dispersion compensation fiber

In a method of fabricating DCF, the fiber is drawn while rotating said optical fiber preform, wherein a rotational speed of said optical fiber preform is 10 to 1,000 rpm, a drawing speed is 50 to 1,000 m/min, and a drawing tension is 2.4 to 13 kg/mm2.

Method and apparatus for drawing an optical fibre

A method for drawing an optical fiber is provided in which a plurality of coating layers having a different viscosity is formed on the outer peripheral surface of a first optical fiber drawn from an optical fiber perform, then a second optical fiber with the coating layers formed thereon is drawn in a slanted direction relative to the drawing axis of the first optical fiber to form a third optical fiber incorporating a twist.

OPTICAL FIBER AND OPTICAL TRANSMISSION LINE COMPRISING THE OPTICAL FIBER

The present invention provides an optical fiber which has negative dispersion and negative dispersion slope in a wavelength band in use, and can carry out single-mode operation in which distortion due to the non-linear phenomenon can be suppressed so as to be suitable for wavelength multiplexed optical transmissions. When the relative index differences of center core (1), first side core (2), second side core (3), and inner cladding (4) from the silica level are ¿1, ¿2, A3, and ¿4, 1.7%¿¿1, ¿2¿-0.3%, 0.25%¿¿3, and ¿4<0. Furthermore, the value A, determined by dividing the diameter a1 of the center core 1 by the diameter a2 of the first side core 2, is set to 0.15¿A¿0.2, and the value B, determined by dividing the diameter a3 of the second side core 2 by the diameter a2 of the first side core 3, is set to 1 Подробнее

Optical fiber

An optical fiber comprising a core (11) at least a center portion of which is made of glass essentially consisting of silica, a first cladding (12) which is provided around the core (11) and has a refractive index smaller than that of the core (11) and a second cladding (13) which is provided around the first cladding (12) and has a refractive index larger than that of the first cladding (12) and lower than that of the core (11), which has improved environmental resistance and small wavelength dispersion in a wide range of wavelength.

Optical fiber and method of manufacturing the same

СПОСОБ ИЗГОТОВЛЕНИЯ ОПТИЧЕСКИХ ВОЛОКОН

Оптическое волокно, имеющее оптические характеристики, систематически изменяющиеся по его длине, изготовлено путем введения ряда цилиндрических таблеток в покрывающую стеклянную трубку и нанесения на эту трубку покрытия из частиц стекла. Каждая таблетка содержит область сердцевины и возможно слой стеклянного покрытия. Прилежащие таблетки способны образовать участки оптического волокна, обладающие различными оптическими свойствами. Перед уплотнением частиц стекла через трубку и по поверхности таблеток пропускают поток хлора. Когда трубка начинает спекаться, поток хлора прекращают, и спекающиеся частицы создают направленную внутрь силу, которая заставляет трубку смыкаться на таблетках, которые одновременно сплавляют друг с другом. Полученную заготовку для вытягивания можно вытянуть в оптическое волокно с низкими потерями. Этот способ особенно полезен для изготовления дисперсионно управляемых одномодовых оптических волокон. 4 с. и 26 з.п. ф-лы, 13 ил.

ОПТИЧЕСКОЕ ВОЛОКНО С ДИСПЕРСИОННЫМ СМЕЩЕНИЕМ

FIELD: fiber optical communication lines. SUBSTANCE: in compliance with first variant single-mode optical fiber includes central part of core, stepped part of core around central part which refractive index is less than that of central part of core and sheath which refractive index is less than that of stepped part of core arranged around stepped part of core. In accordance with second variant single-mode optical fiber incorporates central part of core, peripheral part of core around central part which refractive index is higher than that of central part of core and sheath which refractive index is less than that of stepped part of core arranged around stepped part of core. In wave length range 1490-1625 n chromatic dispersion of fiber is from 7 to 15 ps/(km•nm), effective area of core is equal to 60-150 μm 2 , dispersion angle is under 0.09 ps/(km•nm). Loss for bending amounts to 100 dB/m or less. Optical communication line has optical fiber with dispersive displacement and fiber with compensation for dispersion compensating for inclination of dispersive curve and chromatic dispersion of optical fiber with dispersive displacement. EFFECT: raised operational characteristics of optical fiber. 14 cl, 9 dwg 6соэ9гсс ПЧ сэ (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ” 2 216 029' (51) МПК? 13) С2 С 02 В 6/22 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 2001116072/28, 08.09.2000 (24) Дата начала действия патента: 08.09.2000 (30) Приоритет: 09.09.1999 /Р 11/256289 (43) Дата публикации заявки: 20.06.2003 (46) Дата публикации: 10.11.2003 (56) Ссылки: УР 11-84158 А, 26.03.1999. ЕР 0851245 А2, 01.07.1998. СВ 2331162 А, 12.05.1999. ЕР 0749024 А2, 18.12.1996. ЕР 0859247 А2, 19.08.1998. КЦ 96122040 АЛ, 20.01.1999. (85) Дата перевода заявки РСТ на национальную фазу: 09.06.2001 (86) Заявка РСТ: УР 00/06141 (08.09.2000) (87) Публикация РСТ: \М/О 01/18575 (15.03.2001) (98) Адрес для переписки: 129010, Москва, ул. Б.Спасская, 25, стр.3, ООО ...

POLARISATIONSMODEN-GEKOPPELTER MONOMODENWELLENLEITER

Method of fabricating dispersion shifted optical fibre with smooth annular ring refractive index profile

IMPROVEMENTS IN OR RELATING TO OPTICAL TRANSMISSION MEDIA

... 1,245,891. Optical fibre manufacture. WESTERN ELECTRIC CO. Inc. 2 Jan., 1969 [8 Jan., 1968], No. 277/69. Heading C1M. [Also in Division G2] An optical transmission fibre is drawn from a starting stock whilst heating under vacuum. The stock consists of a central cylindrical fibre 31 surrounding spacer fibres 33, 32, 321 of lower refractive index, and a vacuum light optically absorbing containing sleeve 36. During drawing the sleeve collapses to fit snugly over the spacers and the central fibre is deformed. The spacers may have different diameters and/or different refractive indices.

SYSTEM FOR THE DECREASE OF PMD IN AN OPTICAL FIBER

DEVICE FOR REDUCING THE POLARIZATION INTERMODE DISPERSION OF AN OPTICAL FIBER DURING PULLING

GLASS FIBER WITH LARGE EFFECTIVE SURFACE

PROCEDURE FOR MANUFACTURING A TORDIERTEN OPTICAL FIBER WITH REDUCED POLARIZATION INTERMODE DISPERSION

PROCEDURE FOR THE PRODUCTION OF A GATHERING MOLD FOR AN OPTICAL FIBER AND FOR THE EXECUTION OF THE PROCEDURE APTITUDE SUBSTRATE PIPE

Suppression of stimulated brillouin scattering in optical fiber

OPTICAL FIBRE HAVING LOW SPLICE LOSS AND METHOD FOR MAKING IT

Dispersion tailoring in optical fibres

Method for producing optical fiber

Optical fiber

Polarization mode coupled single mode waveguide

Method of making optical fibers

DISPERSION COMPENSATING FIBER

Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index nCL. The core includes at least three radially adjacent regions, a central core region, a moat region having a refractive index nM that is sufficiently lower than nCL such that .DELTA.M <= -0.4 %, and a ring region. As the ring region exhibits sufficiently high refractive index at a sufficiently long distance from the outer edge of the moat region, the fiber can exhibit low values of negative dispersion slope at low values of negative dispersion and yet exhibit good bending loss. This ring region is also capable of imparting to the fiber a relatively high cutoff wavelength, so that the present invention is particularly well suited for use in L-band systems. A particularly suitable fiber has an index profile in which that part of the ring region at the transition between the moat and the ring region has a refractive index such that its delta value is close to zero.

METHOD OF MAKING OPTICAL FIBERS

An optical fiber and method of making, wherein the optical fiber alternates between regions having different diameters along its length, wherein the refractive index of said blank and the diameters of said fiber are chosen to result in a fiber having alternating regions of positive and negative dispersion at a wavelength which is greater than 1480 nm, yet preferably has a low net dispersion and dispersion slope. A preferred such profile consists of a core region surrounded by a cladding region, said core region comprised of a central core region which is updoped with respect to said cladding region, said central core region surrounded by a moat region which is downdoped with respect to said cladding region, and said moat region is surrounded by an annular ring region which is updoped with respect to said cladding region.

METHOD AND DEVICE FOR PRODUCING COVERED OPTICAL FIBER AND COVERED OPTICAL FIBER

... ▓▓▓A method of producing a covered optical fiber (21) comprising the steps of ▓drawing a glass fiber (13) after heating and softening one end of an optical ▓fiber base material (11), applying coating (16, 19) onto the glass fiber (13), ▓letting the covered optical fiber (21) pass through a periodically swinging ▓guide roller (23) to twist the covered optical fiber (21), and thereby ▓imparting the glass fiber (13) inside the covered optical fiber (21) twisting ▓around the axis, wherein the covered optical fiber (21) passed through the ▓guide roller (23) is allowed to pass through a free section (26 through 27) ▓permitting a free turning on the axis to thereby offset longitudinally an ▓elastic torsion accumulated when the covered optical fiber (21) is alternately ▓reversed in its longitudinal twisting directions, a length (L) (m) of the free ▓section being at least Lo (m) defined by Lo (m)= (maximum production line ▓speed (m/min))/(number of back-and-forth swings per unit time of swinging ...

OPTICAL FIBRE HAVING LOW SPLICE LOSS AND METHOD FOR MAKING IT

The invention relates to a process for making a non-zero dispersion shifted optical fibre having low splice loss and low attenuation and to and to an optical fibre produced by this process. A reduction of the splice loss is observed with decreasing the drawing tension. The optical fibre comprises a core region that includes three segments and a inner cladding segment, each having a maximum refractive index percent difference, .DELTA.delta/%, i=0-3, the subscript / referring to a particular, the core segments being selected such that .DELTA.delta0% > .DELTA.delta2% > .DELTA.delta1% >= 0 and .DELTA.delta2% > .DELTA.delta3% >= 0. Optical fibres exhibiting low splice loss were draw at tensions not larger than 150 g, preferably not larger than 100 g.

PROCESS AND DEVICE FOR MANUFACTURING A FIBER KEEPING A CIRCULAR POLARIZATION

The invention provides a process for forming a fiber keeping a circular polarization and a device for implementing this process. This process consists, during drawing and twisting of the fiber from a formable material source, in remelting on the surface a part of the volume of said fiber in a zone where it is subjected to twisting stresses.

METHOD OF FABRICATING A CYLINDRICAL OPTICAL FIBER CONTAINING AN OPTICALLY ACTIVE FILM

A method of forming a preform which has a glass core (10) surrounded by an outer glass cladding (16) with a coating (18) of an optically active material disposed between the core (10) and cladding (16). The method includes providing a glass core (10) having a viscosity which lies within a given preselected temperature range, followed by forming a substantially homogeneous coating (18) of an optically active material over the surface of the core, with the coating having a viscosity which is equal to or less than the viscosity of the glass core. A glass cladding (16) is formed over the coated layer (18), with the cladding (16) having a viscosity which overlaps the viscosity of the core glass (10) and a thermal coefficent of expansion compatible with that of the core. The optically active material is an inorganic material which includes a metal, metal alloy, ferrite, magnetic material or a semiconductor. The invention includes the product formed by the process.

METHOD AND APPARATUS FOR THE PRODUCTION OF OPTICAL FIBERS WITH REDUCED POLARIZATION MODE DISPERSION

DISPERSION MANAGED OPTICAL WAVEGUIDE

A single-mode optical waveguide fiber designed to limit power penalty due to four wave mixing and a method of making the waveguide is disclosed. Variations in properties, e.g., radius or refractive index, of the waveguide fiber core provide a total dispersion which varies along the length of the waveguide. The algebraic sum of products of length times total dispersion is controlled to a pre-selected value for each waveguide fiber which makes up a system link. Proper choice of total dispersion variation magnitude and sub-length results in a system link wherein a signal travels only short distances in waveguide portions having total dispersion near zero. However, the variation of the total dispersion provides a system link which has a pre-selected dispersive effect on the signal over a selected wavelength range. The dispersive effect on the signal can be chosen to be essentially zero. A number of techniques for fabricating DM fiber are also disclosed.

ELLIPTICAL CORE FIBER WITH AXIALLY DECREASING ASPECT RATIO AND METHOD

A single-mode elliptical core optical fiber (15) suitable for the transmission of solitons has a core aspect ratio that changes along the length of the fiber to provide a fiber dispersion that monotonically decreases along the fiber from one end thereof to the other. The fiber preform (30) is drawn from a draw blank (10) having a glass core (11) surrounded by cladding glass (12) and having apertures (13) that are diametrically opposed with respect to the core (11). The cross-sectional area of the void space within the apertures (13) varies with respect to the longitudinal distance along the apertures.

METHOD OF HAVING OPTICAL FIBER HAVING DEPRESSED INDEX CORE REGION

A tube (36) is connected to a different tube (27). A rod (22) is put in the different tube (27). Soot (28) is deposited on the outside of the different tube (27). A gas (55) is made to flow through the different tube (27). This structure (32) is then collapsed thereby creating an optical fiber preform.

SUPPRESSION OF STIMULATED BRILLOUIN SCATTERING IN OPTICAL FIBER

Suppression of stimulated Brillouin scattering (SBS) by broadening the energy spectrum of participating SBS photons and/or phonons is achieved in an optical fiber having a core with both radially nonuniform viscosity and CTE profiles provided by alternating layers of glass modifying dopants such as phosphorus and fluorine. The nonuniform thermal expansion and viscosity profiles impart a residual, permanent, nonuniform stress in the fiber. The SBS suppressing effect provided by the nonuniform stress can be controlled and enhanced by applying a uniform or nonuniform tensile force to the fiber as it is being drawn. A preform for the fiber is also disclosed.

制造具有降低的偏振模式色散的光纤远程通信光缆的方法

... 一根用于通信的光缆(1)包括一个光芯(2)以及多个围绕所述光芯(2)的保护和加强部分或层(7，11和13)，该光芯(2)反过来包括一个中心加强部分(4)，一个聚合物层(5)，多根包含于聚合物层(5)中的光纤(3)，以及覆盖聚合物层(5)的一个薄护套(6)，该光纤具有关于它们自己的轴的交替自旋，该自旋具有至少4转每米的最大值，该光纤还包括一个具有平均椭圆度在0.25到0.55范围内的芯区(12)，这使得由于成缆所导致的双折射效应大大降低。 ...

Article comprising optical fiber having low polarization mode dispersion, and method of making the fiber

METHOD FOR REALIZATION OF PREFORM FIBEROPTIC HAS

PROCEDE DE FABRICATION D'UN OBJET A STRUCTURE CHIRALIQUE ISSU A PARTIR D'UNE SOURCE DE MATIERE FORMABLE ET DISPOSITIF METTANT EN OEUVRE CE PROCEDE

L'INVENTION CONCERNE UN PROCEDE PERMETTANT DE REALISER UN OBJET PRESENTANT UNE STRUCTURE CHIRALIQUE ET UN DISPOSITIF POUR LA MISE EN OEUVRE DE CE PROCEDE. CE PROCEDE DE REALISATION CONSISTE, DANS UNE PREMIERE VARIANTE, A ETIRER, TORSADER ET TREMPER SIMULTANEMENT L'OBJET AVANT DE L'ENDUIRE PAR UN PRODUIT POUR FORMER UNE ENVELOPPE PERMETTANT DE FIGER LA TORSION DE CET OBJET. DANS UNE DEUXIEME VARIANTE, LES ETAPES D'ETIRAGE ET DE TREMPE SONT REALISEES AVANT LES ETAPES DE TORSION ET D'ENDUCTION. L'INVENTION S'APPLIQUE NOTAMMENT A LA FABRICATION DE FIBRES OPTIQUES.

MANUFACTORING PROCESS OF FIBEROPTICS AND FIBEROPTICS OBTAINED ACCORDING TO THIS PROCESS

APPARATUS AND METHOD FOR DRAWING OPTICAL FIBER

PREPARATION METHOD OF PREFORM FOR OPTICAL FIBERS

A preform of optical fibers is prepared by the stages of: manufacturing a glass cylinder having the refractive index distribution of an axis symmetry by vapor axial deposition method, changing a tube by drilling a hole at its center, separately preparing a glass cylinder having the same refractive index distribution by vapor axial deposition method, treating it in the given diameter by drawing method, inserting it into the tube, heating and uniting in a single body. Copyright 1997 KIPO ...

OPTICAL FIBER PREFORM PRODUCING METHOD, OPTICAL FIBER PRODUCING METHOD, AND OPTICAL FIBER

A method for producing a preform of an optical fiber having a complex structure with high precision, a method for producing an optical fiber, and an optical fiber are disclosed. The method for producing a preform of an optical fiber comprising a center core portion disposed in the center of the optical fiber and having an index of refraction the maximum value of which is Nc, a depressed portion disposed outside the center core portion and at least having an index of refraction the minimum value of which is Nd, a ring portion having an index of refraction the minimum value of which is Nr, and an outer cladding layer having an index of refraction the maximum value of which is No, the relationship between the indexes of refraction being Nc >= Nr > No > Nd. The method comprises a glass rod producing step of inserting a rod including at least the center core portion into a pipe including at least the depressed portion and integrating them into one piece by collapsing to produce a glass rod, ...

A METHOD, SYSTEM AND DEVICE TO DISTRIBUTE TO HIM TO AN OPTICAL FIBER, A ROTATION PREDETERMINED AROUND ITS AXIS

Se divulgan un método y un sistema basado en dicho método para impartirle a una fibra optica, una rotacion predeterminada alrededor de su eje, donde se hace rotar la fibra a través de una fuerza de rozamiento que actua sobre la fibra mientras avanza en una direccion predeterminada. La rotacion realmente impartida a la fibra optica es medida en línea mientras la fibra avanza en la direccion, y la fuerza de rozamiento es controlada en respuesta a dicha rotacion medida de manera de obtener la rotacion predeterminada. También se divulgan dispositivos de giro que actuan sobre la fibra optica a través de una fuerza de rozamiento controlable en forma externa y particularmente adecuados para ser utilizados con el método y dentro del sistema de la presente.

A MULTIMODE FIBER AND METHOD FOR FORMING IT

L'invention concerne une fibre (10) optique multimode possédant une première largeur de bande laser supérieure à 220 MHz.km dans la fenêtre de 850 nm, une deuxième largeur de bande laser supérieure à 500 MHz.km dans la fenêtre de 850 nm, et une deuxième largeur de bande OFL d'au moins 500 MHz.km dans la fenêtre de 300 nm. La fibre multimode est capable de faire fonctionner un système de télécommunication comprenant des sources d'énergie à diodes électroluminescentes et des sources laser haute puissance. L'invention concerne également un procédé de fabrication et d'essai de la fibre optique multimode.

OPTICAL FIBER

An optical fiber (10) consisting of a core area (1) and a clad area (2) surrounding the core area (1), a plurality of areas consisting of sub-media (4) each having a refractive index different from that of a main medium (3) constituting the clad area (2) being provided in the main medium (3), wherein the areas consisting of these sub-media (4) are disposed in specified one or a plurality of toroidal areas (21-2m), and the centers of the areas consisting of the sub-media (4) within respective toroidal areas (21-2m) are respectively disposed on the same circumferences having the centers at the center of the core.

Graded index optical fiber

A graded index optical fiber with a structure which results in improved pulse dispersion characteristics is disclosed. The refractive index properties of the fiber core may be defined in terms of coaxially nested tubular regions, each of different index of refraction, which together form a radially graded index of refraction. The optical properties of each tubular region vary periodically along the longitudinal direction. The longitudinal variation of each tubular region is in approximate antiphase with the longitudinal variation of the tubular regions immediately adjacent to it. In the disclosed structure each tubular region is composed of at least two intertwined helical ribbons of material.

Apparatus for applying spin to optical fiber and optical fiber manufacturing method and apparatus using the same

A method of applying spin to a coated optical fiber to be rotated on its longitudinal axis so that the optical fiber has an ultra-low PMD (Polarization Mode Dispersion) includes the steps of: guiding the coated optical fiber so as not to be deviated from a certain range off a drawing axis at a lower end of an optical fiber coating point; giving torque to the optical fiber by contacting the coated optical fiber with a driving roller which vibrates on the center of an axis substantially parallel to a drawing direction at a lower end of the guiding point; and adjusting an amplitude (A) of the driving roller and a distance (l) between the guiding point and the vibrating point so as to control an angle (θ) between the vibrating optical and the drawing axis. This makes it possible to control a spin rate (spins/m) of the optical fiber generated by rotation.

Methods and apparatuses for correcting mechanical twist in optical fiber

Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical twist is mounted and fiber is drawn from the end of the spool to impart a specified counteracting mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is drawn there from, allowing the system to generate a precise amount of counteracting mechanical twist in the fiber.

Method for introducing controlled spin in optical fibers

Optical fiber is provided with a periodically reversing spin while the fiber is pulled through a melt zone. A cooled region of the fiber downstream from the melt zone passes between a pair of opposed elements. The opposed elements are moved so that surface regions engaging the fiber move in opposite lateral directions relative to one another, thus spinning the fiber about its axis. The lateral movement of the engaged surface portions is periodically reversed to reverse the spin direction. The opposed elements may include belts or rollers, which can be tilted to orientations oblique to the longitudinal direction of the fiber.

Preform for optical fiber and method of producing optical fiber

PCT No. PCT/JP95/00814 Sec. 371 Date Apr. 16, 1996 Sec. 102(e) Date Apr. 16, 1996 PCT Filed Apr. 25, 1995 PCT Pub. No. WO95/29132 PCT Pub. Date Nov. 2, 1995A single-mode optical fiber preform is produced by a process where a porous glass body of a core rod for a single-mode optical fiber is dehydrated and made into a glass to prepare a core rod for the optical fiber, clad layers are deposited on the circumference of the core rod for the optical fiber so as to give an outer diameter of a desired value, and then these are dehydrated and made into glass. At this time, the diameter of a part corresponding to the core rod for the optical fiber in the optical fiber obtained by drawing the preform for optical fiber is controlled to 1.9 times or more the mode field diameter, which is a diameter that allows light having a wavelength of 1.55 mu m to pass therethrough. As a result, a preform for a single-mode optical fiber with which an optical fiber little influenced by defects can be obtained can ...

Method and Apparatus for the Production of Optical Fibers With Reduced Polarization Mode Dispersion

A method and apparatus for manufacturing an optical fiber includes the steps and/or means of: drawing a fiber from a heated preform by applying a pulling force to the fiber; spinning the fiber while it is drawn, wherein the step of spinning the fiber includes the sub-steps of winding the fiber on a spin roller by a winding arc, such that a friction force is generated between the fiber and the spin roller resulting from the winding arc and from the pulling force; axially displacing the spin roller such that the fiber is caused to roll over the spin roller surface by the friction force.

Anti-PMD system

The invention provides an anti-PMD system comprising: an anti-PMD pulley (1) over which an optical fiber (4) is to roll and which is mounted to rotate about an axis of rotation (ar); and at least two optical fiber guide devices (2, 3) situated on either side of the anti-PMD pulley (1); the axis of rotation (ar) of the anti-PMD pulley (1) being stationary; the only degree of freedom of the anti-PMD pulley (1) being rotation about the axis of rotation (ar) of the anti-PMD pulley (1); and at least one of the guide devices (2, 3) being movable in translation in a translation direction (dt) that is not orthogonal to the axis of rotation (ar) of the anti-PMD pulley (1).

Dispersion-shifted optical fibre and method of manufacturing the same

In an optical fiber of this invention, the MFD is increased to effectively suppress the influence of nonlinear optical effects. A method of manufacturing the optical fiber effectively prevents bubble occurrence in a transparent preform, deformation of the preform, and flaws on the preform surface during the manufacture. The optical fiber has, from its center to the peripheral portion, a first core having a first refractive index n 1 , a second core having a second refractive index n 2 (< n 1 ), a first cladding having a third refractive index n 3 (< n 2 ), and a second cladding having a fourth refractive index n 4 (> n 3 , < n 2 ). The outer diameter of the second cladding is set to be 25 to 40 µm. Specifically, the refractive indices of the first and second claddings of the optical fiber preferably increase in the radial direction from the inner side thereof to the peripheral side thereof. This structure is obtained by adjusting the supply amount of a fluorine material in the manufacturing process of preform regions corresponding to first and second claddings such that the contents of fluorine decreases in the radial direction.

ОДНОМОДОВЫЙ ВОЛОКОННО-ОПТИЧЕСКИЙ ВОЛНОВОД С УПРАВЛЯЕМОЙ ДИСПЕРСИЕЙ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ (ВАРИАНТЫ)

Одномодовый волновод предназначен для уменьшения энергетических потерь из-за четырехволнового смешения. Волновод содержит область стеклянной сердцевины, имеющую профиль распределения показателя преломления и окруженную слоем стеклянной оболочки, который имеет показатель преломления nc меньший, чем по меньшей мере часть профиля распределения показателя преломления указанной области стеклянной сердцевины. Волновод включает множество участков вдоль своей длины и имеет изменяющуюся полную дисперсию, которая в заранее заданном диапазоне длин волн меняет знак от положительной к отрицательной и от отрицательной к положительной от одного участка к другому вдоль длины волновода. Изменяющаяся полная дисперсия включает по меньшей мере первую полную дисперсию Di одного знака на некоторых участках и вторую полную дисперсию Dj противоположного знака на других участках, каждый участок состоит из сегментов ( dli, dlj). Каждый сегмент имеет соответствующую по существу постоянную полную дисперсию (Di, Dj ...

ERSTELLUNGSVERFAHREN DER OPTISCHEN FASER, UND VORRICHTUNG, DIE DIESE VERWENDET

Dispersion tailoring using holey optical fibres

PROCEDURE AND DEVICE FOR BRINGING A CONTROLLED SPIN INTO OPTICAL FIBERS

Polarization mode coupled single mode waveguide

Optical fiber and method of making optical fiber

Controlled dispersion optical fiber

Waveguides having axially varying structure

Method of making dispersion decreasing and dispersion managed optical fiber

Methods and systems for predicting an optical fiber performance parameter

A method for predicting polarization mode dispersion (PMD) in an installed optical fiber. Values of PMD are measured for a first optical fiber at various points in time during the manufacture and installation of the first optical fiber. Values of PMD are identified that correspond to sensitive ones of the various points in time. A set of correlation coefficients is calculated based on the values of PMD corresponding to the sensitive ones of the various points in time. An installed value of PMD for a second optical fiber is predicted based on the set of correlation coefficients.

Manufacturing method and manufacturing apparatus of optical fiber

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.

Patent DE3010005C2

분산시프트파이버

본 발명은, 비선형(非線刑)광학효과를 발현을 유효하게 억제가능하고, 장거리전송에 적합한 분산시프트파이버를 제공하는 것을 과제로 한 것이며, 그 해결수단에 있어서, 코어부와 클래드부를 구비하고, 신호광의 파장영역에서의 분산치가 0[ps/nm/km]은 아니고, 또한, 절대치가 1.0∼4.5[ps/nm/km]인, 분산슬로우프의 절대치가 0.13[ps/n㎡/km]이하이고, 실효코어단면적이 70[㎛ 2 ]이상이며, 1.55㎛대역의 파장의 광의 전송손실이 0.25[dB/km]이하인 굴절율분포를 가진 것을 특징으로 한것이다.

光纤和用于制造低偏振模色散和低衰减光纤的方法

一种光纤制造方法,它包括以下步骤,提供具有纵向延伸中线孔的圆柱形玻璃光纤预制件,和在合适的情况下封闭该孔,以得到均匀和对称的孔的封口。该方法可以包括首先封住中线孔的第一端和第二端,以防止气体从它中间流过。较佳的是该方法包括通过将预制件拉丝成光纤以封闭预制件的中线孔。

色散控制光纤及其大尺寸预制坯的制造方法

色散控制光纤和大尺寸预制坯的制造方法。该色散控制光纤包括纤芯和包层,该纤芯由SiO 2 、GeO 2 和P 2 O 5 构成,该包层由SiO 2 、GeO 2 、P 2 O 5 和氟利昂构成。选择P 2 O 5 的含量不超过构成该纤芯复合物总重量的10%。用于MCVD法色散控制光纤的大尺寸预制坯的制造方法包括,在沉积管的内周边沉积SiO 2 、GeO 2 、P 2 O 5 和氟利昂以便形成包层,并且在该包层的内周边上沉积SiO 2 、GeO 2 和P 2 O 5 以便形成纤芯层。

광섬유에 인가되는 스핀을 모니터링하는 방법 및 양방향스핀의 대칭성을 확보하기 위한 광섬유 제조방법

본 발명은 PMD(Polarization Mode Dispersion, 편광모드분산)의 저감을 위해 광섬유에 인가되는 스핀을 모니터링하는 방법에 관한 것이다. 본 발명의 방법은 모재로부터 인선된 고온의 광섬유에 스핀을 인가하는 단계와; 광섬유에 인가된 스핀으로 인해 발생되는 자연 발생적인 산란광으로부터 스핀 광섬유의 고유한 산란무늬를 카메라를 이용하여 촬영하는 단계; 및 상기 촬영된 산란무늬를 디스플레이하는 단계를 포함한다. 따라서, 상기 디스플레이되는 산란무늬에 근거하여 광섬유에 인가된 스핀의 주기와 스핀율을 관찰하는 것이 가능하다.

Preparation method of preform for optical fibers

A preform of optical fibers is prepared by the stages of: manufacturing a glass cylinder having the refractive index distribution of an axis symmetry by vapor axial deposition method, changing a tube by drilling a hole at its center, separately preparing a glass cylinder having the same refractive index distribution by vapor axial deposition method, treating it in the given diameter by drawing method, inserting it into the tube, heating and uniting in a single body.

Non-contact type optical fiber drawing system for controlling polarization mode dispersion of optical fiber

본 발명은 편광모드분산 제어를 위한 광섬유 인출 장치에 관한 것으로서, 개시된 광섬유 인출 장치는 광섬유 인출 타워에 장착되는 인출 설비들 중, 광섬유 모재에 열을 균일하게 공급하는 용융로에 있어서, (a) 주 몸체; (b) 상기 주 몸체와 동축으로 위치하며, 상기 주 몸체의 직경 크기보다 작은 보조 몸체; 및 (c) 내면 외주방향을 따라서 적어도 하나 이상 형성된 슬릿과, 상기 인출된 광섬유 중심방향으로 상기 슬릿과 연통되게 연장되는 적어도 하나 이상의 개구로 구성되며, 상기 개구와 슬릿을 경유하여 공급된 가스가 상기 인출된 광섬유로 향하여 상기 광섬유의 편광을 비접촉구조로 제공하는 제1중공형 회전체로 구성된다. 따라서, 본 발명은 비접촉식으로 광섬유의 편광모드분산을 효과적으로 제어할 수 있게 되었다.

Large effective area optical fiber

An optical waveguide fiber having a relatively large effective area which exhibits low attenuation, low PMD and low microbending sensitivity. A step-index refractive index profile is advantageously used.

Methods and apparatus for forming heat treated optical fiber

A method for forming an optical fiber includes drawing the optical fiber from a glass supply and treating the fiber by maintaining the optical fiber within a treatment temperature range for a treatment time. Preferably also, the fiber is cooled at a specified cooling rate. The optical fiber treatment reduces the tendency of the optical fiber to increase in attenuation due to Rayleigh scattering, and/or over time following formation of the optical fiber due to heat aging. Apparatus are also provided.

Method for manufacturing dispersed mobile optical fiber having smooth annular ring refractive index profile

1. 청구범위에 기재된 발명이 속한 기술분야 분산이동광섬유에서 특히, 코아 주위에 코아 보다 굴절율이 낮은 환상고리형 굴절율을 갖는 형태이며, 제조 공법상에는 석영관 내부에 화학가스를 공급하여 외부열원에 의해 가열, 증착하는 엠씨브이디(MCVD)방법에 의한 코아의 굴절율을 매끄럽게 하여 광섬유 상태에서의 기하구조를 균일하게 하는 방법에 관한 것이다. 2. 발명이 해결하려고 하는 기술적 과제 환상고리형 프로파일을 갖는 분산이동광섬유의 모재는 그 코아의 굴절율 형태가 원뿔형태인데, 상기 코아중심에서 최대 굴절율을 갖기 위해 상기 코아중심으로 갈수록 GeO 2 의 양이 많아져야 한다. 이때, 상기 GeO 2 의 양을 증가시키는 과정에서 증착패스간의 굴절율이 떨어지고, 상기 코아중심의 굴절율이 떨어지는 센터 딥(center dip)현상이 나타나는 문제점과, 종래의 단일모드 광섬유에 비해 코아경이 작아서 모재를 광섬유로 인출했을때 광섬유 모재길이별로 광특성의 편차가 많이 발생하는 문제점을 해결한다. 3. 발명의 해결방법의 요지 모재증착시 증착온도와 증착유량을 조절하여 리플이 없는 굴절율을 만들고, 모재제조시 고온에 의해 코아중심에서 증발되는 GeO 2 가 차지했던 부분에 소정양의 SF 6 와 CF 4 를 사용하여 상기 GeO 2 가 차지했던 부분을 식각하여 센터딥을 줄이는 방법과, 모재의 외경을 크게하여 코아경을 균일하게 하는 방법을 제공한다. 4. 발명의 중요한 용도 매끄러운 환상고리 굴절율 프로파일을 갖는 분산이동광섬유의 제조방법.

Method of manufacturing mobile dispersed light guide (variants)

FIELD: manufacturing industry. SUBSTANCE: claimed method of manufacturing mobile light guide with smooth circular refraction coefficient profile comprises heating quartz tube by outside oxygen or hydrogen burner at temperatures from 1875 to 1903 C and feeding mixture including 5200 mg/m SiCl 4 ,, 430 mg/m GeCl 4 ,, 30 mg/m POCl 3 and 9 sq.cm/m CF 4 for spraying first coating onto quartz tube. Raw material including 3300 mg/m SiCl 4 , 1150 mg/m GeCl 4 ,, 20 mg/m POCl 3 and 1500 cubic cm/m O 2 is then added into quartz tube at constant temperature of 190 C for spraying circular zone. Mixture including 3800 mg/m SiCl 4 , 430 mg/m GeCl 4 , 10 mg/m POCl 3 and 7 cubic cm/m CF 4 is then added into quartz tube at constant temperature from 1890 to 1897 C for spraying second coating. This done, core is sprayed, light guide is condensed, etched, sealed and closed. EFFECT: creation of uncurving refraction coefficient of light guide. 7 cl, 5 dwg, 3 tbl 60сСтс ПЧ ГЭ (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВО ”” 2 120 917‘ 517 МК © 03 В 37/075 13) СЛ 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 96121510/03, 05.11.1996 (30) Приоритет: 07.11.1995 КВ 40089/1995 (46) Дата публикации: 27.10.1998 (56) Ссылки: ЦЗ 4755022 А, 05.07.88. ЗИ 1145923 А, 15.03.85. 4$ 4737119 А, 12.04.88. Ц$ 4516826 А, 14.05.85. (71) Заявитель: Самсунг Электроникс Ко., Лтд. (КК) (72) Изобретатель: Сеунг-Хун Ох (КК), Юнг-Сик Юн (КК) (73) Патентообладатель: Самсунг Электроникс Ко., Лтд. (КК) (54) СПОСОБ ИЗГОТОВЛЕНИЯ ДИСПЕРСНОГО ПОДВИЖНОГО ОПТИЧЕСКОГО СВЕТОВОДА (ВАРИАНТЫ) (57) Реферат: Способ изготовления дисперсионного подвижного оптического световода с гладким кольцевым профилем коэффициента преломления содержит следующие операции: нагревают кварцевую трубку внешней кислородной или водородной горелкой от 1875 до 1903°С и подают в кварцевую трубку смесь, включающую 5200 мим УС, 430 м/м СеСи, 30 м/м РОСЁЬ и 9 см3/м СНА, напыления первого покрытия. Затем подают сырье, ...

Process for preparation of optical glass fiber

1. 청구범위에 기재된 발명이 속한 기술분야 1. TECHNICAL FIELD OF THE INVENTION 분산이동광섬유에서 특히, 코아 주위에 코아보다 굴절율이 낮은 환사고리형 굴절율을 갖는 형태이며, 제조공법상에는 석영관 내부에 화학가스를 공급하여 외부열원에 의해 가열, 증착하는 엠씨브이디(MCVD)방법에 의한 코아의 굴절율을 매끄럽게 하여 광섬유 상태에서의 기하구조를 균일하게 하는 방법에 관한 것이다. Especially in dispersed mobile optical fibers, it has a circular ring-type refractive index having a lower refractive index than the core around the core, and according to the manufacturing method, a chemical gas is supplied inside a quartz tube and heated and deposited by an external heat source. The present invention relates to a method for smoothing the refractive index of a core by means of making the geometry uniform in an optical fiber state. 2. 발명이 해결하려고 하는 기술적 과제 2. The technical problem to be solved by the invention 환상고리형 프로파일을 갖는 분산이동광섬유의 모재는 그 코아의 굴절율 형태가 원뿔형태인데, 상기 코아중심에서 최대 굴절율을 갖기위해 상기 코아중심으로 갈수록 GeO 2 의 양이 많아져야 한다. 이때, 상기 GeO 2 의 양을 증가시키는 과정에서 증착패스간의 굴절율이 떨어지고, 상기 코아중심의 굴절율이 떨어지는 센터 딥(center dip)현상이 나타나는 문제점과, 종래의 단일모드 광섬유에 비해 코아경이 작아서 모재를 광섬유로 인출했을 때 광섬유 모재길이별로 광특성의 편차가 많이 발생하는 문제점을 해결한다. The base material of the dispersed mobile optical fiber having a cyclic ring profile has a conical shape of the core, and in order to have the maximum refractive index at the core, the amount of GeO 2 must be increased toward the core. At this time, the refractive index between the deposition pass in the process of increasing the amount of GeO 2 is falling, the center dip phenomenon in which the refractive index of the core center is lowered, the core diameter is smaller than the conventional single-mode optical fiber to form a base material It solves the problem that the variation of optical characteristics occurs by the length of the base material when the fiber is drawn out. 3. 발명의 해결방법의 요지 3. Summary of Solution to Invention 모재증착시 증착온도와 증착유랭을 조절하여 리플이 없는 굴절율을 만들고, 모재제조시 고온에 의해 코아중심에서 증발되는 GeO 2 가 차지했던 부분에 소정양의 SF 6 과 CF 4 를 사용하여 상기 GeO 2 가 차지했던 부분을 식각하여 센터딥을 줄이는 방법과, 모재의 외경을 크게하여 코아경을 균일하게하는 방법을 제공한다. The GeO 2 to adjust the base ...

Pharmaceutical Compositions for Increasing Testosterone

본 발명은 유효량의 하기 일반식(I)의 화합물 또는 그의 약학적으로 허용가능한 염 및 약학적으로 허용가능한 담체를 포함하는, 포유동물에서 테스토스테론의 혈중 농도를 증가시키기 위한 약학 조성물에 관한 것이다. 상기 식에서, R 1 및 R 2 는 동일하거나 상이할 수 있으며; R 1 과 R 2 가 동일한 경우, 각각 메틸 또는 에틸기이며; R 1 및 R 2 가 상이한 경우, 둘중 하나는 메틸 또는 에틸기이고, 다른 하나는 수소 또는 벤질기이다.

Process for producing a low polarization mode dispersion optical fiber

在一种生产低偏振模色散光纤的方法中，所述方法包括将玻璃预制坯拉丝成为光纤的步骤，以及在拉丝过程中使所述光纤绕光纤轴线旋转的步骤，所述旋转是根据一个双向的且大致为梯形的旋转函数来施加的，所述双向旋转函数包括大致恒定幅度区(曲线的平稳区)(P)和发生旋转反向的转变区(T)，其中大致恒定幅度区的范围(p)大于转变区的范围(t)，且20米长的光纤上的旋转反向次数至多为2。

OPTICAL FIBER AND OPTICAL COMMUNICATION SYSTEM USING THIS FIBER

Dispersion compensating fiber and manufacturing method thereof

Optical fiber preform, optical fiber manufacturing method, and optical fiber

Manufacture of low polarization mode dispersion single mode optical fibers and products thereby

本发明涉及一种低偏振模色散单模光纤的制造方法和用该方法制备的光纤。在常规拉丝塔的下游端安装搓动系统，其搓动方式不改变光纤的拉丝路径，其搓动轮的轴线在始终平行于拉丝方向的平面内周期性摆动，高速运动的光纤带动搓动轮的外表面绕其轴线旋转，当搓动轮所在平面与拉丝方向存在一定夹角时，其沿光纤径向上的角速度分量反作用在光纤上使之产生扭转，并以机械波的形式传播到拉丝上游的玻璃体软化区产生塑性形变并固化到新拉制的光纤中，使光纤沿长度方向上引入频率和幅度紊乱的非正弦波形扭转分布，增加引起偏振模色散的双折射现象的两正交模式间的能量耦合，用该方法制造出的光纤偏振模色散系数低于0.03ps/km 1/2 。

Optical fiber drawing equipment having break failure reduction device by controlling the curvature radius of the optical fiber

본 발명에서는 광섬유(1)의 방향 전환을 위한 적어도 하나 이상의 고정 롤러(7)가 코팅장치(5), 자외선 경화장치(6) 및 캡스턴(미도시)에서 선택되는 적어도 하나 이상의 장치 이후에 설치되는 광섬유 인선장치에 있어서, 적어도 하나 이상의 이동 롤러(8, 9)가 상기 고정 롤러(7)의 이후에 연속하여 설치되는 광섬유 곡률 반경 조정을 통한 광섬유 단선 저감 장치를 구비하는 광섬유 인선 장치를 개시한다. 본 발명에 의해 광섬유(1) 단면에 대한 곡률반경을 매우 크게 증가시켜 인선공정중에 발생하는 굽힘응력 및 응력집중을 완화하고 특히 미소 입자(13)나 크랙(14)에 따른 응력집중을 완화하여 결국 광섬유(1)의 단선을 저감할 수 있다. 특히 광섬유(1)의 강도가 평균값보다 높거나 낮은 경우에 이동 롤러(8, 9)의 위치를 변경하여 곡률 반경을 조절함으로써 응력을 평균보다 높거나 낮게 조절할 수 있다. 또한 이동 롤러(8, 9)를 추가적으로 구비함으로써 고속 인선시 고정 롤러(7)만을 구비하는 것보다 진동 안정성을 더 할 수 있다.

Method and device for producing covered optical fiber and covered optical fiber

광섬유 모재(11)의 끝 부분을 가열하고 연화시켜 유리 섬유(13)를 꺼내고, 해당 유리 섬유(13) 상에 피복(16, 19)을 실시하여, 제조한 피복 광섬유(21)를 주기적으로 요동하는 요동 가이드 롤러(23)를 통과시켜 피복 광섬유(21)를 비틀음으로써 해당 피복 광섬유(21) 내부의 유리 섬유(13)에 축 주위의 비틀림을 부여하는 피복 광섬유(21)의 제조 방법에 있어서, 상기 요동 가이드 롤러(23)를 통과한 피복 광섬유(21)를 축 주위로 자유롭게 회전 가능한 프리 구간(26 내지 27 사이)을 통과시킴으로써, 해당 피복 광섬유(21)에 있어서 비틀림 방향이 긴 변 방향으로 교대로 반전함으로써 쌓인 탄성 비틀림을 긴 변 방향으로 상쇄하는 공정을 구비하고 있으며, 이 프리 구간의 구간 길이 L(m)은 으로 정의되는 Lo(m) 이상이다.

Method of controlling optical fibre polarization mode chromatic dispersion in optical fibre wire drawing process

本发明公开了一种光纤拉丝设备安装有一个摆动滑轮，该摆动滑轮在一个旋转方向上然后在相反的方向上交替地向光纤施加扭力。为了控制施加给光纤的扭力，形成光纤和滑轮的图像。分析这些图像以确定光纤相对于滑轮的位置。假设光纤在滑轮上滚动，根据所计算的位置来计算所述扭力。

Dispersion-shifted fiber

本发明的目的在于提供一种可有效地防止非线性光效应发生并具有适于远距离光传输的结构的色散偏移光纤。在波长为1,550nm时,该色散偏移光纤具有以下各种性能:色散度的绝对值为1.0至4.5ps/nm/km,色散梯度的绝对值不大于0.13ps/nm 2 /km,有效芯截面积不小于70μm 2 ,及相对于波段为1.55μm的光的传输损耗不大于0.25dB/km。

Method of manufacturing optical fiber

본 발명은, 목표로 하는 파장 분산 특성을 갖는 광 섬유를 용이하게 제조할 수 있는 광 섬유의 제조방법에 관한 것이다. 해당 광 섬유의 제조방법에서는, 광 섬유 모재의 일부를 먼저 선 인발함으로써 얻어진 일정 길이의 광 섬유의 컷 오프 파장이 측정된다. 이 측정된 컷 오프 파장에 기초하여, 목표로 하는 파장 분산 특성을 얻기 위한 목표 글래스 직경이 구해진다. 이어서, 구해진 목표 글래스 직경이 되도록 광 섬유 모재의 잔부가 선 인발되어 광 섬유가 제조된다. This invention relates to the manufacturing method of the optical fiber which can manufacture easily the optical fiber which has the target wavelength dispersion characteristic. In the manufacturing method of the said optical fiber, the cutoff wavelength of the optical fiber of the fixed length obtained by first drawing out a part of optical fiber base material is measured. Based on this measured cutoff wavelength, the target glass diameter for obtaining the target wavelength dispersion characteristic is calculated | required. Subsequently, the remainder of the optical fiber base material is predrawn to obtain the obtained target glass diameter, thereby producing an optical fiber. 광 섬유 모재, 파장 분산 특성, 목표 글래스 직경, 컷 오프 파장, 모드 필드 직경 Optical fiber substrate, wavelength dispersion characteristics, target glass diameter, cutoff wavelength, mode field diameter

Method for producing an optical fibre telecommunications cable with reduced polarization mode dispersion

An optical cable (1) for telecommunications comprises an optical core (2) and a plurality of protecting and reinforcing elements or layers (7, 11 and 13) placed around the optical core, the optical core (2) comprising, in turn, a central reinforcing element (4), a polymer layer (5), a plurality of optical fibres (3) incorporated in the polymer layer (5) and a thin sheath (6) which covers the polymer layer (5), the optical fibres having an alternating spin about their own axes with a maximum value of at least 4 twists per metre, and comprising a core (12) having a mean ellipticity in the range from 0.25 to 0.55, in such a way that the effects of birefringence of the fibres caused by the cabling process are significantly reduced.

Method for producing optical fiber

本发明的目的是提供一种生产光纤的方法，其中即使拉纤速度设置在等于或大于250m/min的很大的值，也能适当地扭绞光纤使其具有低的偏振模色散，并且能使裸光纤的外径和光纤的外径的变化很小。这里提供一种制造光纤11的方法，其中一光纤预制棒通过加热而被软化以向下拉出裸光纤，此裸光纤被涂覆，并且，在裸光纤由于摆动导辊13周期性摆动而围绕其轴自旋的同时制造出光纤11。在该方法中，为了扭绞光纤，光纤11最先接触到的摆动导辊13的辊表面13a的摆动幅度等于或小于±7mm，但等于或大于±0.5mm。所以，当摆动幅度被设定在上述范围内时，裸光纤的外径和光纤的外径的变化减小，能使偏振模色散减小。在本发明中，设置在用于形成涂层的涂覆装置和摆动导辊之间的偏转限制导辊组件具有狭窄的V形沟槽，且其旋转轴水平设置。并且，摆动导辊被设置在允许偏转限制导辊组件使光纤的运动方向弯曲的位置。由于该结构，能使光纤在偏转限制导辊组件的前后的偏转尽量小。因而，设置在紫外线灯和转限制导辊组件之间的诸如气泡传感器这样易受偏转影响的装置对产品是优质品或次等品会有更精确的判定。通过使用具有狭窄的V形沟槽的偏转限制导辊组件而使偏转很小，光纤不再撞击导辊，能减少涂层从裸光纤剥落。

Dispersion compensating fiber and optical transmission system including the same

The present invention relates to a dispersion-compensating fiber for improving a transmission system with it in total chromatic dispersion and dispersion slope in the 1.55 µm wavelength band. The dispersion compensating fiber according to the present invention is characterized by having the following characteristics for light in the 1.55 µm wavelength band: chromatic dispersion preferably not less than -40 ps/km/nm and not more than 0 ps/km/nm; dispersion slope not less than -0.5 ps/km/nm2 and not more than -0.1 ps/km/nm2; transmission loss not more than 0.5 dB/km; polarization mode dispersion not more than 0.7 ps.cndot.km-1/2; cut-off wavelength not lees than 0.7 µm and not more than 1.7 µm in the length of 2 m; and bending loss at a diameter of 20 mm, not more than 100 dB/m. The dispersion-compensating fiber is optically connected at a ratio of appropriate lengths with a dispersion-shifted fiber as a compensated object; which can improve a system including the dispersion-compensating fiber in a total chromatic dispersion and dispersion slope of the system in the 1.55 µm band.

Data aggregation server supporting rapid query response with sparse multi-dimensional data

Improved method of and apparatus for joining and aggregating data elements integrated within a relational database management system (RDBMS) using a non-relational multi-dimensional data structure (MDD). The improved RDBMS system of the present invention can be used to realize achieving a significant increase in system performance (e.g. deceased access/search time), user flexibility and ease of use. The improved RDBMS system of the present invention can be used to realize an improved Data Warehouse for supporting on-line analytical processing (OLAP) operations or to realize an improved informational database system or the like.

METHOD FOR MANUFACTURING A BLANK FOR OPTICAL FIBERS CONTAINING LONGITUDINAL GRADATIONS

Method and device for producing covered optical fiber and covered optical fiber

In a fabrication method of coated optical fiber 21, the coated optical fiber 21 is fabricated by heating to soften an end of an optical fiber preform 11 to draw a glass fiber 13 out therefrom, laying coatings 16, 19 on the glass fiber 13 to make the coated optical fiber 21, and guiding the coated optical fiber 21 via a swing guide roller 23 periodically swinging, to twist the coated optical fiber 21, thereby imparting twists about the axis to the glass fiber 13 inside the coated optical fiber 21. The fabrication method comprises a step of passing the coated optical fiber 21 having passed the swing guide roller 23, through a free zone (between 26 and 27) in which the coated optical fiber 21 is allowed to freely rotate about the axis, and thereby longitudinally canceling out elastic torsion stored in the coated optical fiber 21 because of longitudinally alternate inversion of twist directions thereof, wherein a zone length L (m) of the free zone is not less than Lo (m) defined as follows:    Lo (m) = [a maximum drawing speed of the coated optical fiber (m/min)]/[the number of clockwise and counterclockwise swing motions per unit time of the swing guide roller (motions/min)].

Patent FR2537732B1

IMPROVED OPTICAL FIBER GUIDING DEVICE

Method of making optical fibers

Different pieces of glass (81, 82) are fused together to create a preform (9 4) from which a glass fiber with axially varying properties is drawn.

Patent FR2515632B1

Method for manufacturing coated optical fiber

Fiber for reduced polarization effects in amplifiers

A single mode optical fiber (36) suitable for use in an amplified fiber optic system (30) which includes an inner glass core doped with rare earth element and an outer transparent glass cladding. The fiber (36) exhibits a plurality of mode coupling sites formed at regular intervals along the length (L) of the fiber (36) which provides for a reduced DOP (Degree of Polarization). The sites are formed by a twist at regular intervals along the fiber length (L) by applying a torque to the fiber (36). The method of forming the fiber is also disclosed.

Method of fabricating dispersion mobile optical fiber with smooth annular ring refractive index profile

有平滑环状折射率分布的分散移动光纤的制造方法包括步骤：用外部氧气或氢气燃烧器加热石英管，使温度从1875℃升至1903℃，向石英管供料，沉积第一皮层；在1900℃的恒定温度下，供给原料，沉积环状部分；将温度从1890℃升到1897℃，同时供料，沉积第二皮层；在温度从1920℃降至1890℃的九个过程中加热，沉积芯件部分；和使沉积的光纤在2300-2360℃冷凝，密封。

Optical fiber for soliton transmission and method of making

A single-mode optical fiber suitable for the transmission of solitons has a refractive index profile that changes along the length of the fiber to provide a fiber dispersion that monotonically decreases along the fiber from one end thereof to the other. The fiber includes a core of maximum refractive index n1 and a radius a, surrounded by cladding material having a refractive index n2 which is less than n1. The fiber core includes a central region that extends to the longitudinal axis of the fiber and an outer region, the inner and outer regions being separated by a region of depressed refractive index. The inner radius a1 of the region of depressed refractive index is greater than zero and the maximum radius a0 of the region of depressed refractive index is less than a. The fiber preform can be made by depositing layers of glass particles on an elongated mandrel, the composition of glass particles being varied with respect to longitudinal position along the preform during the deposition of some of the layers.

Method of manufacturing optical fiber

Method and apparatus for controlling the polarization mode dispersion of an optical fiber during drawing

DEVICE FOR TURNING OPTICAL FIBER, METHOD FOR MANUFACTURING OPTICAL FIBER AND OPTICAL FIBER

ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß RU (19) (11) 2006 122 257 (13) A (51) ÌÏÊ C03B 37/027 (2006.01) ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÇÀßÂÊÀ ÍÀ ÈÇÎÁÐÅÒÅÍÈÅ (21), (22) Çà âêà: 2006122257/03, 17.12.2004 (71) Çà âèòåëü(è): ÔÓÄÇÈÊÓÐÀ ËÒÄ. (JP) (30) Êîíâåíöèîííûé ïðèîðèòåò: 26.12.2003 JP 2003-432264 (43) Äàòà ïóáëèêàöèè çà âêè: 10.01.2008 Áþë. ¹ 1 (72) Àâòîð(û): ÎÊÀÄÀ Êåíäçè (JP), ÕÀÐÀÄÀ Êîèòè (JP) (87) Ïóáëèêàöè PCT: WO 2005/063640 (14.07.2005) R U (54) ÓÑÒÐÎÉÑÒÂÎ ÄËß ÑÊÐÓ×ÈÂÀÍÈß ÎÏÒÈ×ÅÑÊÎÃÎ ÂÎËÎÊÍÀ, ÑÏÎÑÎÁ ÈÇÃÎÒÎÂËÅÍÈß ÎÏÒÈ×ÅÑÊÎÃÎ ÂÎËÎÊÍÀ È ÎÏÒÈ×ÅÑÊÎÅ ÂÎËÎÊÍÎ (57) Ôîðìóëà èçîáðåòåíè 1. Óñòðîéñòâî äë ñêðó÷èâàíè îïòè÷åñêîãî âîëîêíà, ñîäåðæàùåå ñêðó÷èâàþùèé ðîëèê, êîòîðûé ïîñðåäñòâîì ïðèäàíè îïòè÷åñêîìó âîëîêíó ñêðó÷èâàíè ñîîáùàåò ñêðó÷èâàíèå ðàñïëàâëåííîé ÷àñòè çàãîòîâêè îïòè÷åñêîãî âîëîêíà, êîòîðà ðàñïîëîæåíà íà ñòîðîíå âõîäà îïòè÷åñêîãî âîëîêíà; è îïîðíóþ ÷àñòü, êîòîðà ïîääåðæèâàåò ñêðó÷èâàþùèé ðîëèê, ïðè ýòîì òî÷íîñòü íàðóæíîé îêðóæíîñòè ñêðó÷èâàþùåãî ðîëèêà, êîãäà ñêðó÷èâàþùèé ðîëèê îáðàçóåò ÷àñòü óñòðîéñòâà ñêðó÷èâàþùåãî ðîëèêà, ñîñòàâë åò 15 ìêì èëè ìåíüøå. 2. Ñïîñîá èçãîòîâëåíè îïòè÷åñêîãî âîëîêíà, ñîäåðæàùèé ñòàäèþ âûò ãèâàíè , â êîòîðîì îïòè÷åñêîå âîëîêíî áåç ïîêðûòè ôîðìèðóþò ïîñðåäñòâîì ïëàâëåíè è ïîñëåäóþùåãî âûò ãèâàíè çàãîòîâêè îïòè÷åñêîãî âîëîêíà; ýòàï ïîêðûòè , â êîòîðîì îïòè÷åñêîå âîëîêíî áåç ïîêðûòè , êîòîðîå áûëî ñôîðìèðîâàíî íà ýòàïå âûò ãèâàíè , ïîêðûâàþò ñ îáðàçîâàíèåì îïòè÷åñêîãî âîëîêíà; è ýòàï ñêðó÷èâàíè îïòè÷åñêîãî âîëîêíà, â êîòîðîì óñòðîéñòâî äë ñêðó÷èâàíè îïòè÷åñêîãî âîëîêíà ïî ï.1 ïðèêëàäûâàþò ê ÷àñòè íàðóæíîé îêðóæíîñòè îïòè÷åñêîãî âîëîêíà, êîòîðîå áûëî îáðàçîâàíî íà ýòàïå ïîêðûòè , è âûçûâàþò åãî êîëåáàíè òàê, ÷òî îïòè÷åñêîìó âîëîêíó ñîîáùàåòñ ñêðó÷èâàíèå, â ðåçóëüòàòå ÷åãî ñêðó÷èâàíèå ñîîáùàåòñ ðàñïëàâëåííîé ÷àñòè çàãîòîâêè îïòè÷åñêîãî âîëîêíà. 3. Îïòè÷åñêîå âîëîêíî, êîòîðîå èçãîòîâëåíî ñ èñïîëüçîâàíèåì ñïîñîáà èçãîòîâëåíè îïòè÷åñêîãî âîëîêíà ïî ï.2. Ñòðàíèöà: 1 RU A 2 0 0 6 1 2 2 2 5 7 A Àäðåñ äë ...

METHOD FOR MANUFACTURING A CHIRALIC STRUCTURE OBJECT MADE FROM A SOURCE OF FORMABLE MATERIAL AND DEVICE USING THE SAME

L'INVENTION CONCERNE UN PROCEDE PERMETTANT DE REALISER UN OBJET PRESENTANT UNE STRUCTURE CHIRALIQUE ET UN DISPOSITIF POUR LA MISE EN OEUVRE DE CE PROCEDE. CE PROCEDE DE REALISATION CONSISTE, DANS UNE PREMIERE VARIANTE, A ETIRER, TORSADER ET TREMPER SIMULTANEMENT L'OBJET AVANT DE L'ENDUIRE PAR UN PRODUIT POUR FORMER UNE ENVELOPPE PERMETTANT DE FIGER LA TORSION DE CET OBJET. DANS UNE DEUXIEME VARIANTE, LES ETAPES D'ETIRAGE ET DE TREMPE SONT REALISEES AVANT LES ETAPES DE TORSION ET D'ENDUCTION. L'INVENTION S'APPLIQUE NOTAMMENT A LA FABRICATION DE FIBRES OPTIQUES. THE INVENTION CONCERNS A PROCESS FOR REALIZING AN OBJECT WITH A CHIRAL STRUCTURE AND A DEVICE FOR IMPLEMENTING THIS PROCESS. THIS EMBODIMENT PROCESS CONSISTS, IN A FIRST VARIANT, IN SIMULTANEOUS STRETCHING, TWISTING AND SOAKING THE OBJECT BEFORE COATING IT WITH A PRODUCT TO FORM AN ENVELOPE ALLOWING TO FREEZE THE TORSION OF THIS OBJECT. IN A SECOND VARIANT, THE STRETCHING AND TEMPERING STEPS ARE CARRIED OUT BEFORE THE BENDING AND COATING STEPS. THE INVENTION APPLIES IN PARTICULAR TO THE MANUFACTURE OF OPTICAL FIBERS.

Glass fiber with a large effective area

Optical fiber, non-linear optical fiber, optical fiber amplifier, wavelength converter and optical fiber making method

作为具有高非线性的光纤(非线性光纤)结构，使用在芯部区域10的外周上设置第一包层区域20和第二包层区域30的双包层结构。通过采用双包层结构，即使在为了增大非线性系数γ，提高芯部内添加的GeO 2 的添加浓度来提高非线性折射率，另外使得芯部与包层的比折射率差增大而减小有效截面面积A eff 时，也可充分地缩短截止波长λc。这样，具有充分的非线性的同时实现截止波长缩短的光纤、非线性光纤、使用其的光放大器、波长变换器以及光纤的制造方法。

Manufacturing method and manufacturing apparatus of optical fiber

本发明提供一种光纤线材的制造方法，具有：加热熔融光纤母材的步骤、从上述光纤母材的加热熔融部拉出光纤裸线的步骤、冷却被从上述光纤母材拉出的上述光纤裸线的步骤、在被冷却后的上述光纤裸线的表面设置涂层的步骤、通过使上述涂层固化来得到光纤线材的步骤、以通过将扭矩从上述光纤线材经由上述光纤裸线传递至上述加热熔融部来向上述光纤裸线施加扭转形变的方式向上述光纤线材施加扭转的步骤以及卷绕上述光纤线材的步骤。

Dispersion-compensating fiber and method of fabricating the same

This invention relates to a dispersion-compensating fiber which can be drawn at a lower temperature and can further reduce optical transmission loss. This dispersion-compensating fiber comprises a core portion containing a high concentration of GeO 2 and a cladding portion formed around the outer periphery of the core portion. The cladding portion comprises a first cladding containing fluorine or the like as an index reducer, a second cladding having a higher refractive index than that of the first cladding, and a third cladding which becomes a glass region substantially noncontributory to propagation of signal light. In particular, the third cladding contains a desired impurity such that the glass viscosity thereof becomes lower than that of the second cladding or pure silica cladding at a predetermined temperature.

Fiber optic that has sinusoidal spinning function

Una fibra óptica que tiene un hilado (200) sustancialmente sinusoidal congelado que tiene una amplitud de hilado y un período de función de hilado (T), caracterizada porque una relación de dicha amplitud de hilado a dicho período de función de hilado (T) de dicho hilado (200) sustancialmente sinusoidal congelado está en el intervalo: de 0,2 a 0,6 vueltas m2 si el período de función de hilado (T) está comprendido entre 1,7 y 3,3 m; de 0,4 a 0,7 vueltas/m2 si el período función de hilado (T) está comprendido entre 1,2 y 6,7 m; de 0,5 a 1,2 vueltas/m2 si el período de función de hilado (T) está comprendido entre 6,7 y 15 m. An optical fiber having a frozen substantially sinusoidal spinning (200) having a spinning amplitude and spinning duty period (T), characterized in that a ratio of said spinning amplitude to said spinning duty period (T) of said frozen substantially sinusoidal yarn (200) is in the range: 0.2 to 0.6 turns m2 if the spinning function period (T) is between 1.7 and 3.3 m; from 0.4 to 0.7 turns/m2 if the spinning function period (T) is between 1.2 and 6.7 m; from 0.5 to 1.2 turns/m2 if the spinning function period (T) is between 6.7 and 15 m.

Method for producing optical fiber

A method for producing an optical fiber having a low polarization dispersion characteristic achieved by suitable twisting the optical fiber even the optical fiber is produced at a fiber drawing speed of over 250 m/min and having a small variation in diameter and a small variation in the outside diameter in the length direction. The method comprising softening an optical fiber matrix by heating, drawing an optical fiber (11) downward from the matrix, covering the optical fiber (11) with a coating, axially twisting the optical fiber by means of a rocking guide roller (13) which periodically rocks is characterized in that the rocking amplitude at the roller face (13a) of the rocking guide roller (13) where the optical fiber (11) comes into contact first is in a range between ±7 mm and ±0.5 mm in a direction perpendicular to the vertical.

Production of core wire of optical fiber

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Controlled dispersion optical fiber

Method for providing controlled spin in optical fiber

A fiber ( 106 ) having low polarization mode dispersion is made by heating the end of a preform ( 100 ) with a furnace ( 101 ). The fiber is drawn from the heated end. The fiber passes between two rollers ( 102, 104 ). As the fiber passes therebetween, the angular tilt of each of the rollers is changed so that a spin is imparted to the fiber.

Dispersion compensating devices and systems

Disclosed is a family of dispersion compensating optical fibers that are adapted for use with conventional single-mode transmission fibers that are optimized for zero dispersion operation at a wavelength in the range from 1290 nm to 1330 nm to form a transmission link suitable for low dispersion operation in the 1520-1565 nm wavelength window. The dispersion compensating fibers are capable of providing a dispersion more negative than -20 ps/nm-km and attenuation less than 1 dB/km at wavelengths in the 1520-1565 nm region. Certain of the dispersion compensating fibers also exhibit a dispersion versus wavelength relationship having a negative slope in the 1520-1565 nm region, to compensate for the dispersion versus wavelength slope of the transmission fiber. The dispersion compensating fiber can be advantageously combined with a fiber amplifier to form a compensator that is adapted to overcome attenuation introduced into the system by the dispersion compensating fiber. In one embodiment, the dispersion compensating fiber is also a distributed fiber amplifier.

Method of making spun optical fiber with low PMD

An optical fiber, and a method of making such optical fiber, wherein the optical fiber exhibits a beatlength greater than about 0.5 meters, and the fiber is spun to provide a polarization mode dispersion in the spun state of said fiber which is less than 0.05 ps/km 1/2 . The fiber is spun by employing a spin having a spin repeat distance of at least 1 meter and a plurality of varying spin reversal distances occurring within the spin repeat distance. The spin preferably alternates between clockwise and counterclockwise directions.

Optical fiber

The present invention relates to an optical fiber, wherein PMD will not significantly increase even when an external factor, such as a lateral pressure, a bending and the like, is applied to the optical fiber. The optical fiber is imparted with a twist that is an elastic torsion with stress. In the condition that a twist rate, being the number of rotations per unit length by the twist, is represented by f(z) as a function of a position z in a longitudinal direction of the optical fiber, which has a predetermined twist cycle and is defined such that, in one twist cycle, a twist rotation angle in one direction and a twist rotation angle in the opposite direction are equal to each other, when a proportionality coefficient representing circular birefringence per twist rate is denoted by g, an angular frequency is denoted by ω, and external linear birefringence due to a bending and a lateral pressure is denoted by β e , then an average twist cycle L and an average twist rate γ av in the optical fiber satisfy predetermined relational expressions.

Fiber for reduced polarization effects in amplifiers

A single mode optical fiber (36) suitable for use in an amplified fiber optic system (30) which includes an inner glass core doped with rare earth element and an outer transparent glass cladding. The fiber (36) exhibits a plurality of mode coupling sites formed at regular intervals along the length (L) of the fiber (36) which provides for a reduced DOP (Degree of Polarization). The sites are formed by a twist at regular intervals along the fiber length (L) by applying a torque to the fiber (36). The method of forming the fiber is also disclosed.

Optical fiber

Optical fiber

Optical fiber drawing equipment

Optical fiber and method of making optical fiber

An optical waveguide fiber suitable for making a spliced connection between two dissimilar optical waveguide fibers, the method of making the fiber, and the method of splicing dissimilar fibers to lower splice losses.

Multimode fiber and method for forming it

揭示一种多模光纤(10),具有850nm窗口中大于220MHz.km的第一激光器带宽、850nm窗口中大于500MHz.km的第二激光器带宽、以及在300nm窗口中至少500MHz.km的第二OFL带宽。该多模光纤能够操作采用LED功率源和大功率激光器源的电信系统。还揭示制造和测试该多模光纤的方法。

Systems and methods for forming ultra-low PMD optical fiber using amplitude and frequency keyed fiber spin functions

A system and method is disclosed for manufacturing single mode optical fiber which incorporates a spin in the molten fiber during manufacturing. The introduction of spin minimizes a form of distortion called polarization mode dispersion (PMD) and varying the spin, i.e. changing its characteristics, is known to further reduce PMD. However, introducing spin on a molten fiber may result in also introducing twist on the fiber. Twist is a non-permanent rotational force on the cooled fiber which causes stress and is to be avoided. A spin function is disclosed that not only contains a high degree of variability for reducing PMD, but also ensures that mechanical twist on the fiber is minimized, thus reducing stress on the fiber. The spin function modulates either the amplitude, frequency, or both, at the beginning of a cycle to minimize twist on the fiber.

Device for heating an annular surface zone of a threadlike object

A heating device including a carbon dioxide laser beam directed towards a spherical mirror and then directed from an ellipsoidal mirror so as to concentrate the energy of said laser on a surface ring of a threadlike object.

Multi-dimensional database and integrated aggregation server

Optical fibres and their manufacture

Une fibre optique telle que l'on pourrait utiliser pour la transmission de données ou en tant que détecteur, se compose d'un matériau sensiblement exempt de torsion qui est retordu pendant l'étirage de manière à présenter un taux de torsion par unité de longueur supérieur à la biréfringence intrinsèque. Le matériau est exempt de torsion évitant ainsi les efforts de torsion qui produisent une biréfringence circulaire mais l'enroulement établit une moyenne entre la biréfringence linéaire induite par l'effort et la biréfringence due à la forme. L'enroulement assure ainsi la réduction de la dispersion en mode de polarisation résiduelle à une valeur négligeable. La figure 1 illustre une technique de production de ces fibres, dans laquelle une ébauche (10) introduite dans un four d'étirage (13) est enroulée par un moteur (11) pour conférer la torsion nécessaire à la fibre (15). An optical fiber such as could be used for data transmission or as a detector, consists of a material substantially free of twist which is twisted during stretching so as to have a twist rate per unit of length greater than intrinsic birefringence. The material is free of torsion thus avoiding the torsional forces which produce a circular birefringence but the winding establishes an average between the linear birefringence induced by the effort and the birefringence due to the shape. The winding thus ensures the reduction of the dispersion in residual polarization mode to a negligible value. FIG. 1 illustrates a technique for producing these fibers, in which a blank (10) introduced into a drawing furnace (13) is wound by a motor (11) to give the necessary twist to the fiber (15).

A method for suppressing stimulated Brillouin scattering in optical fibers.

(57)【要約】 誘導ブリュアン散乱（ＳＢＳ）フォトン及び／若しくはフォノンを加えるエネルギースペクトルを拡げることによって誘導ブリュアン散乱（ＳＢＳ）を抑制するためには、リン及びフッ素の如きドーパントを加えたガラスを交互に層として、これによって与えられる半径方向の不均一な粘度及びＣＴＥ分布を有する光ファイバにおいて達成される。不均一な熱膨張及び粘度分布は、永久且つ残留不均一応力をファイバに与える。不均一応力によって与えられるＳＢＳ抑制効果は、線引き時に均一若しくは不均一な線引き応力を与えることによって、制御され、高められる。当該ファイバのためのプリフォームについても併せて開示する。

Production of optical fibres

An optical fibre capable of monomode transmission in, and having a wavelength of zero dispersion in, the 1.55µm window and having a core comprising silica and germanium dioxide and a cladding comprising silica is drawn from an appropriate preform at a temperature in the range from 1900°C to 2000°C. Fibres thus produced have low loss compared with fibres drawn at higher temperature.

Method for making an optical fibre having low splice loss

The invention relates to a process for making a non-zero dispersion shifted optical fibre having low splice loss and low attenuation and to and to an optical fibre produced by this process. A reduction of the splice loss is observed with decreasing the drawing tension. The optical fibre comprises a core region that includes three segments and a inner cladding segment, each having a maximum refractive index percent difference, Δdelta/%, i=0-3, the subscript / referring to a particular, the core segments being selected such that Δdelta0% > Δdelta2% > Δdelta1% ≥ 0 and Δdelta2% > Δdelta3% ≥ 0. Optical fibres exhibiting low splice loss were draw at tensions not larger than 150 g, preferably not larger than 100 g.

Method of making optical fibers

The optical fiber alternates between regions having different dia meters along its length, wherein the refractive index and the diameters of said fiber result in alternating regions of positive and negative dispersion at a wavelength greater than 1480 nm, yet preferably has a low net dispersion and dispersion slope. A preferred profile consists of a core region surrounded by a cladding region, said core region comprising a central core region updoped with respect to said cladding region, said central core region surrounded by a moat region downdoped with respect to said cladding region, said moat region surrounded by an annular region updoped with respect to said cladding region. The family of profiles presented when used in conjunction with alternating positive and negative dispersion regions produce low dispersion slope fibers. The family of profiles is useful in conventional WDM applications.

Glass preform for dispersion shifted single mode optical fiber and method for the production of the same

A glass preform for use in the fabrication of a dispersion shifted single mode optical fiber is produced by a method for comprising steps of inserting a core member consisting of an inner core part made of a germanium-added quartz glass which optionally contains fluorine and an outer core part made of a quartz glass having a refractive index smaller than that of the inner core part in a glass tube made of a fluorine-added quartz glass having a refractive index smaller than that of the outer core part, heating the core member and the glass tube to collapse the glass tube and fuse them together to produce a glass perform. The glass preform comprises a core member consisting of an inner core part made of GeO 2 -SiO 2 glass or GeO 2 -F-SiO 2 glass and an outer core part made of F-SiO 2 glass and a cladding made of F-SiO 2 glass and provides a dispersion shifted single mode optical fiber having reduced attenuation of light transmission in the 1.5 μm wavelength band.

Method for manufacturing single mode optical fiber having low polarization mode dispersion

본 발명은 저감된 편광모드분산을 갖는 단일모드 광섬유의 제조 방법을 개시한다. 본 발명에 따른 저감된 편광모드분산을 갖는 단일모드 광섬유의 제조 방법은, 코어(Core)와, 상기 코어를 감싸는 클래드(Clad)로 이루어진 광섬유 모재를 인선하여, 저감된 편광모드분산을 갖는 단일모드 광섬유로 제조하기 위한 방법으로서, (a) 광섬유 모재가 용융로에 의해 고온으로 가열되고, 용융로의 인출구에서 넥다운 인출되는 광섬유가 500mpm 이상의 선속(V f )으로 인선되는 단계; 및 (b) 광섬유의 인선 경로 상에 구비되는 스핀 인가 장치에 의해, 광섬유에 스핀이 인가되는 단계;를 포함하되, 광섬유에 인가되는 스핀량의 최대값(y)이 다음의 수학식 1을 만족하는 것을 특징으로 한다. The present invention discloses a method for producing a single mode optical fiber with reduced polarization mode dispersion. According to the present invention, there is provided a method of manufacturing a single mode optical fiber having a reduced polarization mode dispersion, wherein a single mode having a reduced polarization mode dispersion is obtained by cutting an optical fiber base material composed of a core and a clad surrounding the core. A method for producing an optical fiber, the method comprising: (a) an optical fiber base material is heated to a high temperature by a melting furnace, and an optical fiber necked out at the outlet of the melting furnace is edged at a line speed (V f ) of 500 mpm or more; And (b) applying spin to the optical fiber by the spin application device provided on the edge path of the optical fiber, wherein the maximum value y of the amount of spin applied to the optical fiber satisfies Equation 1 below. It is characterized by. 수학식 Equation 1  One 편광모드분산, 저감, 광섬유, 스핀, 최대값 Polarization mode dispersion, reduction, optical fiber, spin, maximum value

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

A method for producing a preform of an optical fiber having a complex structure with high precision, a method for producing an optical fiber, and an optical fiber are disclosed. The method for producing a preform of an optica l fiber comprising a center core portion disposed in the center of the optical fiber and having an index of refraction the maximum value of which is Nc, a depressed portion disposed outside the center core portion and at least havi ng an index of refraction the minimum value of which is Nd, a ring portion havi ng an index of refraction the minimum value of which is Nr, and an outer claddi ng layer having an index of refraction the maximum value of which is No, the relationship between the indexes of refraction being Nc >= Nr > No &gt ; Nd. The method comprises a glass rod producing step of inserting a rod including at least the center core portion into a pipe including at least the depressed portion and integrating them into one piece by collapsing to produce a glass rod, a glass pipe producing step of producing a glass pipe having a ring portion, and an integrating step of inserting the glass rod into the glass pipe and then integrating them into one piece by collapsing to produce a gla ss body.

Optical fiber and nonlinear optical fiber, optical amplifier and wavelength converter using the same, and method of making optical fiber

Employed as a structure of a highly nonlinear optical fiber (nonlinear optical fiber) is a double-cladding structure in which a first cladding region 20 and a second cladding region 30 are disposed on the outer periphery of a core region 10. Since the double-cladding structure is employed, the cutoff wavelength .lambda.c can sufficiently be shortened even when, in order to increase the nonlinear coefficient .UPSILON., the concentration of GeO2 added into the core is enhanced so as to raise the nonlinear refractive index, or the relative refractive index difference between the core and cladding is increased so as to reduce the effective area A eff. This realizes an optical fiber or nonlinear optical fiber shortening its cutoff wavelength while having a sufficient nonlinearity, an optical amplifier and wavelength converter using the same, and a method of making an optical fiber.

Method of making segmented core optical waveguide preforms

A method of making a segmented core optical waveguide preform for making fiber that is resistant to attenuation increases due to hydrogen and heat aging. A first core region comprising a silica glass rod containing at least a first dopant is inserted into a central opening of a second core region comprising silica soot containing a second dopant. The first core region and second core region are consolidated together to form a segmented core region and cladding is deposited on the outer surface of the segmented core region.

Multi-dimensional database and integrated aggregation server

Improved method of and apparatus for aggregating data elements in multidimensional databases (MDDB). In one aspect of the present invention, the apparatus is realized in the form of a high-performance stand-alone (i.e. external) aggregation server which can be plugged-into conventional OLAP systems to achieve significant improvements in system performance. In accordance with the principles of the present invention, the stand-alone aggregation server contains a scalable MDDB and a high-performance aggregation engine that are integrated into the modular architecture of the aggregation server. The sand-alone aggregation server of the present invention can uniformly distribute data elements among a plurality of processors, for balanced loading and processing, and therefore is highly scalable. The stand-alone aggregation server of the present invention can be used to realize (i) an improved MDDB for supporting on-line analytical processing (OLAP) operations, (ii) an improved Internet URL Directory for supporting on-line information searching operations by Web-enabled client machines, as well as (iii) diverse types of MDDB-based systems for supporting real-time control of processes in response to complex states of information reflected in the MDDB. In another aspect of the present invention, the apparatus is integrated within a database management system (DBMS). The improved DBMS can be used to realize achieving a significant increase in system performance (e.g. deceased access/search time), user flexibility and ease of use. The improved DBMS system of the present invention can be used to realize an improved Data Warehouse for supporting on-line analytical processing (OLAP) operations or to realize an improved informational database system, operational database system, or the like.

METHOD FOR OBTAINING A CHIRAL-STRUCTURE OBJECT DERIVED FROM STRETCHING FROM A SOURCE OF RAMOLLIE MATERIAL, AND DEVICE USING SAID METHOD

L'INVENTION CONCERNE UN PROCEDE PERMETTANT DE REALISER UN OBJET ETIRE 1 PRESENTANT UNE STRUCTURE CHIRALIQUE. CE PROCEDE DE REALISATION CONSISTE A FAIRE SUBIR UNE TORSION 5 A L'OBJET 1 AU COURS DE SON ETIRAGE 4 ET SIMULTANEMENT UNE TREMPE QUI PERMET DE FIGER DANS LA STRUCTURE UNE PARTIE DES CONTRAINTES DE TORSION AINSI OBTENUES. L'INVENTION S'APPLIQUE NOTAMMENT A LA FABRICATION DE FIBRES OPTIQUES. THE INVENTION CONCERNS A PROCESS FOR MAKING A STRETCH OBJECT 1 SHOWING A CHIRAL STRUCTURE. THIS EMBODIMENT PROCESS CONSISTS OF SUBJECTING A TORSION 5 TO THE OBJECT 1 DURING ITS STRETCHING 4 AND SIMULTANEOUSLY A TEMPERING WHICH ALLOWS PART OF THE TORSION STRAINTS THUS OBTAINED TO FREEZE IN THE STRUCTURE. THE INVENTION APPLIES IN PARTICULAR TO THE MANUFACTURE OF OPTICAL FIBERS.

Optical fiber, optical transmission line, optical module and optical transmission system

The present invention relates to an optical fiber which has a structure for further increasing an FOM (=|dispersion|/loss) and which can be applied to a dispersion compensation module. The optical fiber is mainly composed of silica glass and has a core region including a center of an optical axis, a depressed region surrounding the core region, a ring region surrounding the depressed region, and a cladding region surrounding the ring region and doped with F. As compared with the refractive index of pure silica glass, a relative refractive index difference of the core region is 3% or more but 4% or less, a relative refractive index difference of the depressed region is −1% or more but −0.5% or less, a relative refractive index difference of the ring region is 0.01% or more but 0.24% or less, and a relative refractive index difference of the cladding region is −0.3% or more but −0.1% or less. The FOM at the wavelength of 1550 nm is 250 ps/nm/dB or more.

Laser optimized multimode fiber and method for use with laser and led sources and system employing same

Method for the preparation of an optical fiber preform

센터코어와 사이드코어로 구성된 1차 모재의 외주에 외부 중착함으로써 2차 모재의 클래딩층을 완성하는 광파이버의 선행재로서의 계단-지수 실리카 글래스 모재의 제조방법에서, 클래딩층을 위한 외부증착을 1차 모재의 직경대 2차 모재의 직경의 비를 k, 2차 모재를 선인하여 얻어진 광파이버의 영분산 파장(nm)을 λo, 미리 1차 모재의 굴절율 분포에 의거하여 λo와 k 사이의 함수의 미분을 dλo/dk라 할 때, 부등식 |dλo/dk| ≤ 500nm를 만족하도록 수행하는 것에 의한 개선이 제안된다. 이런 식으로 외부증착을 수행시킬 때, 모재를 선인하여 제조한 광파이버의 영분산 파장의 균일성에 큰 개선이 얻어진다.

MULTI-MODE FIBER OPTIMIZED LASER AND METHOD OF USE WITH LED SOURCE AND LASER AND ITS USE SYSTEM

Method of making a twisted optical fiber with low polarisation mode dispersion

A method of manufacturing an optical fiber, whereby a fiber is drawn from a molten extremity of a preform and is subsequently subjected to a torque, thereby causing a portion of the fiber to be twisted about its longitudinal axis and to be endowed with a spin. The torque is applied by running the fiber between a pair of wheels which rotate in mutually opposite senses about two different rotational axes, each wheel having a peripheral curved surface, the wheels being thus arranged that the fiber runs substantially tangential to their curved surfaces and is pressed therebetween, the wheels being moved back and forth relative to one another in a direction substantially perpendicular to the fiber so as to cause the fiber to be rolled back and forth between their curved surfaces.

Method and installation for controlling polarization mode dispersion of an optical fiber during drawing

Multimode optical fibre with enlarged band width

本说明书描述了用于在拉制期间使用扭转而拉制圆形核心多模光纤的一种技术，以增加光纤带宽。本发明提供了一种物品，包括具有基本上是圆形的核心且对核心施加了扭转的多模光纤，该扭转具有非恒定节距并且是每一米光纤至少一个。本发明还提供了一种制造多模光纤的方法，包括以下步骤：(a)制备多模光纤预制品，该预制品具有核心和覆层，预制品的核心具有小于6%的椭圆度，(b)加热该预制品，(c)从预制品拉制光纤，及(d)在步骤(c)期间扭转被拉制的光纤，该扭转具有非恒定节距并且是每一米光纤至少一个。

Dispersion compensating optical waveguide fiber

METHOD OF MAKING INITIAL-BEGINNING OPTICAL WAVE GUIDE

Optical fiber with low pmd and method of making it by spinning

An optical fiber, and a method of making such optical fiber, wherein the optical fiber exhibits a beatlength greater than about 0.5 meters, and the fiber is spun to provide a polarization mode dispersion in the spun state of said fiber which is less than 0.05 ps/km1/2. The fiber is spun by employing a spin having a spin repeat distance of at least 1 meter and a plurality of varying spin reversal distances occurring within the spin repeat distance. The spin alternates between clockwise and counterclockwise directions.

Method, system and device for imparting a predetermined rotation to an optical fibre

A method, and a system based on said method, is disclosed for imparting to an optical fiber a predetermined rotation about its axis, wherein the fiber is rotated by way of a frictional force acting on the fiber while it is advanced in a predetermined direction. The rotation actually imparted to the optical fiber is measured on-line while the fiber is advancing in the direction and the frictional force is controlled responsively to said measured rotation so as to obtain the predetermined rotation. Spinning devices acting on the optical fiber by way of an externally controllable frictional force and particularly suitable to be used with the method and within the system of the present invention are also disclosed.

FIBER FOR REDUCING POLARIZATION EFFECTS IN AMPLIFIERS

Method for manufacturing single mode optical fiber having low polarization mode dispersion

A method for manufacturing a single mode optical fiber with a reduced PMD (Polarization Mode Dispersion), by drawing an optical fiber preform composed of a core and a clad surrounding the core, includes (a) heating the optical fiber preform to a high temperature using a furnace, and drawing an optical fiber from an outlet of the furnace at a linear velocity (V f ) of 500 mpm or above by means of neck-down drawing; and (b) impressing a spin on the optical fiber by means of a spin impressing device provided on a drawing path of the optical fiber, wherein a maximum spatial frequency of spin (y) impressed on the optical fiber satisfies the following equations Exp ⁡ ( 24 ⁢ t - 12 ) ≤ y ≤ - 20 × log ( V f 500 ) + 25 and t=(0.21×CladOval)+(0.04×CoreOval)+(0.17×ECC), where y is a maximum spatial frequency of spin [turns/m], V f is a drawing velocity [mpm], CladOval is a clad ovality [%], CoreOval is a core ovality [%], and ECC is an eccentricity [μm].

Optical fibre with low polarisation mode dispersion

光纤的制造方法，据此方法光纤(7)从预制棒(1)的熔融的端部(3)拉出，接着受一扭矩作用，使此光纤的一部分绕其纵向轴线扭转并被赋予自旋。据此方法，扭矩是通过在绕二不同转轴(13a，13b)，相互以相反的方向转动的一对轮子(11a，11b)间拉动此光纤(7)而施加的，每个轮子(11a，11b)具有一圆周曲面(15a，15b)，轮子(11a，11b)如此设置，使得光纤(7)通过时基本上与二轮的曲面(15a，15b)相切并在其间受压，轮子(11a，11b)在基本上与光纤(7)垂直的方向(d，d′)上一个相对另一个前后运动，以使光纤(7)在轮子的曲面(15a，15b)之间往复滚动。

Suppression of stimulated brillouin scattering in optical fiber

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

METHOD FOR MANUFACTURING AN OBJECT HAVING A CHIRAL STRUCTURE ARISING FROM A SOURCE OF FORMABLE MATERIAL AND DEVICE USING THE SAME