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

PRODUCTION OF OPTICAL FIBERS.

LOW-LOSS MONODECAY OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE WITH LOW DISPERSION.

Network for distribution of signal to multiple user's equipments

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

WAVEGUIDE OPTICAL FIBER FOR AMPLIFICATION WITHIN S-BAND OPTICAL RANGE

An optical waveguide fiber includes: a core region (12) having a relative refractive index percent within the range of from about 1.332% to about 1.628% and an outer radius within the range of from about 1.71 µm to about 2.09 µm; an inner clad layer (14) surrounding and in contact with the core region, the inner layer having a relative refractive index percent within the range of from about 1.30% to about 1.591% and an outer radius within the range of from about 4.41µm to about 5.39µm; an outer clad layer (16) surrounding and in contact with the inner clad layer, the outer clad layer having a relative refractive index within the range of from about 1.305% to about 1.595%. A second embodiment of the invention is also described.

OPTICAL FIBER AND PRODUCTION METHOD THEREOF

An optical fiber using tellurite glass having a zero material dispersion wavelength of at least 2 μm, a non-linear sensitive rate X3 of as high as at least 1 × 10-12 esu, and a heat stability sufficient to be processed into a low-loss fiber, wherein a PCF structure or an HF structure having a strong confinement to a core area is employed, thereby enabling light to be wave-guided at a low loss. A zero dispersion wavelength is controlled to within a communication wavelength band (1.2-1.7 μm) by the size and shape of a hole formed in the core area and by the interval between adjacent holes, and a large non-linearity having a non-linearity constant γ of at least 500 W-1k-1 is provided.

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

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE FIBER.

Dispersion shift optical fiber

Optical fiber

Low attenuation optical waveguide

STRUCTURED TELLURITE GLASS OPTICAL FIBER WITH CONTROLLED ZERO DISPERSION

An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 µm, and a high nonlinear susceptibility .chi.3 equal to or greater than 1 x -12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 µm), and to achieve large nonlinearity with a nonlinear coefficient .gamma. equal to or greater than 500W-1 km-1.

STIMULATED BRILLOUIN SCATTERING SUPPRESSED OPTICAL FIBER

The invention provides a stimulated Brillouin scattering suppressed optical fiber which is easy to be produced, has an almost zero chromatic dispersion over the entirety of an optical fiber in the lengthwise direction, and has a low light loss. That is, in an optical fiber having a property, by which the chromatic dispersion with respect to optical communication signals becomes zero, obtained by changing the relative refractive index difference of the optical fiber and core diameter in the same increase or decrease direction, the relative refractive index difference of the core and the core diameter R are changed in the lengthwise direction of the optical fiber, and the core diameter R is made smaller in line a decrease the relative refractive index difference of the core while the core diameter R is made larger in line with an increase of the refractive index difference, whereby the chromatic dispersion the designated wavelength band is made nearly equal to zero in the entirety of the ...

MONOMODE FIBEROPTIC HAS DISPERSION DECALEE

Shifted dispersion single mode fibre optic index doping technique; has central triangular, rectangular or trapezoidal profile and outer sheath region with specific inner doped region and higher doped outer region sections

L'invention concerne une fibre optique monomode à dispersion décalée, présentant- une gaine avec un indice (ns ) donné,- un coeur de fibre présentant un profil d'indice en gaussienne avec piédestal,caractérisée en ce que le profil d'indice du coeur de fibre présente un anneau externe d'indice (n3 ) supérieur à celui de la gaine (ns ). L'invention permet de mieux contrôler la valeur de la longueur d'onde pour laquelle la dispersion chromatique est nulle, en conservant les autres caractéristiques de transmission des fibres connues, comme le diamètre de mode et l'atténuation.

OPTICAL FIBER FOR METRO NETWORK

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 ...

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.

Dispersion-shifted fiber

The present invention relates to a dispersion-shifted fiber having a structure for effectively lowering polarization-mode dispersion. This dispersion-shifted fiber is a single-mode optical fiber mainly composed of silica glass and has a zero-dispersion wavelength set within the range of at least 1.4 µm but not longer than 1.7 µm. In particular, at least the whole core region of the dispersion-shifted fiber contains fluorine. A dispersion-shifted fiber (54) is a single-mode optical fiber mainly composed of silica glass and comprises an inner core (100) doped with Ge and F; an outer core (200) disposed around the outer periphery of the inner core (100) and doped with Ge and F, having a refractive index lower than that of the inner core (100); an inner cladding (300) disposed around the outer perophery of the outer core (200) and doped with F, having a refractive index lower than that of the outer core (200); and an outer cladding (400) disposed around the outer periphery of the inner cladding ...

Dispersionsverschobene Faser

OPTISCHE FASER.

FIBRE OPTICS ON QUARTZ GLASS BASIS AND PROCEDURE FOR ITS PRODUCTION

WAVEGUIDE OPTICAL FIBER FOR AMPLIFICATION WITHIN S-BAND OPTICAL RANGE

LOW DISPERSION, LOW-LOSS SINGLE-MODE OPTICAL WAVEGUIDE

Disclosed is an optical waveguide fiber having a core surrounded by a layer of cladding material. The core is characterized in that it includes a region of depressed refractive index. The inner radius ai of this region is greater than zero, and the outer radius ao thereof is less than the core radius. By appropriately selecting the core index depression characteristics such as radial location, width, depth and shape, a fiber having the desired waveguide dispersion characteristics can be designed. Dispersion minimization over a wide wavelength range can be achieved, without adverse affect on system loss.

LOW DISPERSION, LOW-LOSS SINGLE-MODE OPTICAL WAVEGUIDE

Abstract of the Disclosure Disclosed is an optical waveguide fiber having a core surrounded by a layer of cladding material. The core is characterized in that it includes a region of depressed refractive index. The inner radius ai of this region is greater than zero, and the outer radius ao thereof is less than the core radius. By appropriately selecting the core index depression characteristics such as radial location, width, depth and shape, a fiber having the desired waveguide dispersion characteristics can be designed. Dispersion minimization over a wide wavelength range can be achieved, without adverse affect on system loss.

GLASS PREFORM FOR DISPERSION SHIFTED SINGLE MODE OPTICAL FIBER AND METHOD FOR THE PRODUCTION OF THE SAME

Abstract: The present invention relates to a glass preform for use in the fabrication of a dispersion shifted single mode optical fiber. The preform is produced by a method 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 into a glass tube made of a fluorine-added quartz glass having a refractive index smaller than that of the outer core part. The method further comprises heating the core member and the glass tube to collapse the glass tube and fuse them together to produce a glass preform. The invention further comprises a glass preform comprising a core member consisting of an inner core part made of GeO2-SiO2 glass or GeO2-F-SiO2 glass and an outer core part made of F-SiO2 glass and a cladding made of F-SiO2 glass. This preform produces a dispersion shifted single mode optical fiber having reduced attenuation of light transmission in the 1.5 µm wavelength band.

OPTICAL FIBER COMPRISING A REFRACTIVE INDEX TRENCH

OPTICAL FIBER COMPRISING A REFRACTIVE INDEX TRENCH A single mode optical fiber is disclosed. The refractive index profile of the fiber comprises a depressed-index or trench region in the cladding region. By suitable adjustment of the position, width and index of the trench region, one or more fiber characteristics can be improved, relative to a similar fiber that does not comprise an index trench.

LOW ATTENUATION OPTICAL WAVEGUIDE

Disclosed is a single mode optical waveguide fiber having a core refractive index profile in which the profile parameters are selected to provide an attenuation minimum. A set of profiles having the same general shape and dimensions is shown to have a group of profiles contained in a sub-set which exhibit a minimum of attenuation as compared to the remaining members of the set. The members of the sub-set have been found to have the lowest effective group index, n geff, and the lowest change in .beta.2 under waveguide fiber bend ing.

Method of producing optical fiber and base material therefor

本发明揭示光纤用母材及光纤的制造方法。将单模光纤用芯棒的多孔质玻璃体脱水、玻璃化，用作光纤用芯棒，在该光纤用芯棒的周围堆积包层，使其外径达到所希望的大小，而后脱水、玻璃化制造单模光纤母材。然后，使将光纤用母材拉丝得到的光纤中相当于光纤用芯棒的部分的直径，在波长1.55μm的光波通过时，为模式场直径的1.9倍以上。结果，可以制成能得到结构缺陷影响小的光纤的单模光纤用玻璃母材。

MONOMODE FIBEROPTIC HAS DISPERSION DECALEE

Monomode optical fibers with offset dispersion having an effective mode surface greater than 65 mu m<2> by optimization of the geometric parameters characteristic of these fibers. The refraction index as a "U" or "W" profile.

OPTICAL FIBER AND A METHOD FOR MANUFACTURING SAME

Optical fiber-use base material and optical fiber manufacturing method

Network for distributing signals to a plurality of user equipment

A network for distributing signals to a plurality of user equipment having a distribution unit and a plurality of optical cables adapted to make the distribution unit communicate with the plurality of user equipment. In turn, each optical cable has an optical fibre having a core, a cladding and a predetermined simple refractive index profile Δn(r). Each optical fibre is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile Δn(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay Δτ at 850 nm that is less than or equal to, about 1 ns/Km.

СПОСОБ ИЗГОТОВЛЕНИЯ ДИСПЕРСНОГО ПОДВИЖНОГО ОПТИЧЕСКОГО СВЕТОВОДА (ВАРИАНТЫ)

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, ...

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

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE WITH LOW ABSORPTION

MANUFACTURE OF DISPERSION SHIFTED SINGLE MODE FIBRE

OPTICAL FIBER AND PRODUCTION METHOD THEREOF

An optical fiber using tellurite glass having a zero material dispersion wavelength of at least 2 .mu.m, a non-linear sensitive rate X3 of as high as at least 1 .times. 10-12 esu, and a heat stability sufficient to be processed into a low-loss fiber, wherein a PCF structure or an HF structure having a strong confinement to a core area is employed, thereby enabling light to be wave-guided at a low loss. A zero dispersion wavelength is controlled to within a communication wavelength band (1.2-1.7 .mu.m) by the size and shape of a hole formed in the core area and by the interval between adjacent holes, and a large non-linearity having a non-linearity constant .gamma. of at least 500 W-1k-1 is provided.

Dispersion-shifted fiber for optical parametric amplifier

Provided is a dispersion-shifted fiber for an optical parametric amplifier. The dispersion-shifted fiber is a silica-based optical fiber and has a large nonlinear coefficient and a small effective area. The dispersion-shifted fiber also reduces a bending loss and a splice loss due to a mode field diameter difference between it and a conventional single mode fiber. For this, the dispersion-shifted fiber comprises a rectangular core with a very small radius and a high refractive index, a depressed inner clad, and an outer clad with a ring. The core and/or the inner clad are/is doped with a heavy metal.

Double-Clad Optical Fibers And Devices With Double-Clad Optical Fibers

A double-clad optical fiber includes a core, an inner cladding and an outer cladding of silica-based glass. The core may have a radius of less than about 5 mum, a first index of refraction n1 and does not contain any active rare-earth dopants. The inner cladding may surround the core and includes a radial thickness of at least about 25 mum, a numerical aperture of at least about 0.25, and a second index of refraction n2 such that n2 Подробнее

DISPERSION SHIFTED OPTICAL FIBER

A dispersion shifted optical fiber where a radius r 0 of a first center segment is 0.5 μm to 2.8 μm, and a relative refractive index difference Δ 0 is 0.4% or more and 0.9% or less. A radius r 1 of a first segment is 1.8 μm or more and 4.5 μm or less. A radius r 2 of a second segment is 4.0 μm or more and 8.0 μm or less, and a relative refractive index difference Δ 2 is 0.00% or more and 0.07% or less. A radius r 3 of a third segment is 4.5 μm or more and 8.5 μm or less, and a relative refractive index difference Δ 3 is 0.285% or more and 0.5% or less. A radius r 4 of a fourth segment is 8.0 μm or more and 16.0 μm or less, and a relative refractive index difference Δ 4 is 0.005% or more and 0.04% or less.

OPTICAL FIBER FOR TO-THE-HOME DISTRIBUTION NETWORKS

SINGLE MODE OPTICAL FIBER

A 1.5 .mu.m zero dispersion single mode optical fiber comprising a center core, a side core disposed on an outer side of the center core and having a refractive index lower than that of the center core, and a cladding portion disposed on an outer side of the side core. Each of the refractive indices of the center core and the side core has a step-like profile in the direction of the radius of the optical fiber. The bending loss is low. The mode field diameter can be increased without deteriorating the bending loss, the splice loss and can be reduced. The chromatic dispersion varies only to a small extent with respect to changes in the core diameter, so that the zero dispersion wavelength can be well controlled.

NETWORK FOR DISTRIBUTING SIGNALS TO A PLURALITY OF USER EQUIPMENT

A network (100) for distributing signals to a plurality of user equipment (42) comprises a distribution unit (40), and a plurality of optical cables (1) adapted to make said distribution unit (40) communicate with said plurality of user equipment (42). In turn, each optical cable (1) comprises an optical fibre (10) having a core (14), a cladding (12) and a predetermined simple refractive index profile .DELTA.n(r). Each optical fibre (10) is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile .DELTA.n(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay .DELTA..tau. at 850 nm that is less than or equal to, about 1 ns/Km.

IN A SINGLE MODE OPTICAL FIBER.

OPTICL FIBRE FOR TO-THE-HOME DISTRIBUTION NETWORK

A network (100) for distributing signals to a plurality of user equipment (42) comprises a distribution unit (40), and a plurality of optical cables (1) adapted to make said distribution unit (40) communicate with said plurality of user equipment (42). In turn, each optical cable (1) comprises an optical fibre (10) having a core (14), a cladding (12) and a predetermined simple refractive index profile Δn(r). Each optical fibre (10) is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile Δn(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay Δτ at 850 nm that is less than or equal to, about 1 ns/Km.

Dispersion shifted optical fiber

A 1.55 m band dispersion shifted optical fiber is provided which has a low loss and low dispersion slope. A core region a is heavily doped with GeO2 . A core region b is composed of pure SiO2 glass. A cladding section is arranged around the core region. The cladding section has a lot of holes extending in the longitudinal direction of the optical fiber. The holes of the cladding section are not located at random, but have a honeycomb structure composed of regular hexagons which have a side length of , and serve as a primitive lattice. The center of the core section has a region having a refractive index higher than that of the periphery of the core section. The core section has the refractive index distribution in which the group velocity dispersion at the operation wavelength of the region becomes the normal dispersion.

Preform for optical fiber and method of producing optical fiber

A 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 μm 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 be produced.

DISPERSION-SHIFT FIBER AND ITS PRODUCTION

PURPOSE: To suppress the change in the refractive index distribution before and after the spinning of a single-mode fiber (dispersion-shift fiber) shifted the zero-dispersion wavelength to the 1.5mm band of wavelength. CONSTITUTION: An outer core having a lower refractive index than the inner core is formed around the inner core, a first clad having a lower refractive index than the outer core is formed around the outer core, and hence a stepwise clad distribution is provided. A second clad having a larger refractive index than the first clad is formed around the first clad to constitute a dispersion-shift fiber having a stepwise refractive index distribution. In this case, an inner core 11 is formed with GeO2-SiO2 the outer core 12 with SiO2 the first core 13 with F-SiO2 and the second clad 14 with SiO2. By this invention, the characteristic predicted value in the preforming stage and the characteristic value of the spun fiber are almost in agreement, low loss is attained, and the quality ...

Network for distributing signals to a plurality of user equipment

Optical fiber

SINGLE MODE OPTICAL WAVEGUIDE

STRUCTURED TELLURITE GLASS OPTICAL FIBER AND PRODUCTION METHOD THEREOF

An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 .mu.m, and a high nonlinear susceptibility .chi.3 equal to or greater than 1 x 10 -12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 .mu.m), and to achieve large nonlinearity with a nonlinear coefficient .gamma. equal to or greater than 500W-1 km-1.

OPTICAL FIBRES

... "OPTICAL FIBRES" An optical fibre capable of monomode transmission in, and having a wavelength of zero dispersion in, the 1.55 .mu.m 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.degree.C to 2000.degree.C. Fibres thus produced have low loss compared with fibres drawn at higher temperature.

OPTICAL TRANSMISSION LINE

An optical transmission line which can restrict both wavelength distortion due to a non-linear phenomenon and wavelength distortion due to dispersion, and which is formed by series-connecting a first optical fiber (8) having a dispersion value of 6 to 14 ps/nm/km in a set wavelength band in a wavelength band of 1.5 .mu.m and a second optical fiber (9) having a dispersion value of - 14 to -6 ps/nm/km in the above set wavelength band, the dispersion slopes of the first optical fiber (8) and the second optical fiber (9) having signs opposite to each other. Light transmitted from an optical transmitter (11) is shone on the first optical fiber, and light transmitted through the first optical fiber (8) is shone on the second optical fiber (9). Absolute value of dispersion in a wavelength band of 1.5 .mu.m of each optical fiber (8), (9) is set to be at least 6 ps/nm/km to restrict four-light-wave mixing, and the above each absolute value is set to be up to 14 ps/nm/km to restrict local dispersion ...

STRUCTURED TELLURITE GLASS OPTICAL FIBER EXHIBITING CONTROLLED ZERO DISPERSION WITHIN A WAVELENGTH BAND CENTRED AT 1.55 .MU.M

An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 µm, and a high nonlinear susceptibility X3 equal to or greater than 1 x 10-12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 µm), and to achieve large nonlinearity with a nonlinear coefficient .gamma. equal to or greater than 500W-1 km-1.

DISPERSION-SHIFTED FIBER

The present invention relates to a dispersion-shifted fiber having a structure for effectively lowering polarization-mode dispersion. This dispersion-shifted fiber is a single-mode optical fiber mainly composed of silica glass and has a zero-dispersion wavelength set within the range of at least 1.4 .mu.m but not longer than 1.7 .mu.m. In particular, at least the whole core region of the dispersion-shifted fiber contains fluorine.

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

Le procédé comprend les étapes consistant à: (a) chauffer un tube de quartz de 1875 deg.C à 1903 deg.C et lui fournir comme matières premières 5200 mg/m de SiCl4 , 430 mg/m de GeCl4 , 30 mg/m de POCl3 et 9 cc/m de CF4 pour déposer un premier revêtement; (b) fournir comme matières premières 3300 mg/m de SiCl4 , 1150 mg/m de GeCl4 , 20 mg/m de POCl3 et 1500 cc/m de O2 à température constante de 1900 deg.C, pour déposer une section de bague annulaire; (c) fournir comme matières premières 3800 mg/m de SiCl4 , 430 mg/m de GeCl4 , 10 mg/m de POCl3 et 7 cc/m de CF4 tout en augmentant la température de 1890 deg.C à 1897 deg.C, pour déposer un second revêtement; (d) chauffer en neuf passes de température diminuant de 1920 deg.C à 1890 deg.C pour déposer une section de noyau, SiCl4 diminuant de 380 mg/m à 260 mg/m, GeCl4 augmentant de 20 mg/m à 195 mg/m et O2 restant constant à 1500 cc/m; et (e) condenser à 2300-2360 deg.C la fibre optique de dépôt terminé, ajouter 30 à 40 cc/m de CF4 au tube de ...

FIBEROPTIC IN ONLY ONE MODE.

Dispersion shifted optical fiber

The present invention relates to a dispersion shifted optical fiber having zero dispersion at a wavelength band of 1.5 mum, which suppresses an increase of transmission loss and an increase of polarization mode dispersion when carrying out fiber drawing. An optical fiber according the invention is provided with the first core (refractive index n1.), the second core (refractive index n2), the first clad (refractive index n3) and second clad (refractive index n4) in this order from the center to outside, wherein the abovementioned refractive indexes are in a relationship of n1>n4>n2>n3, Ge which is at a ratio of 0.4 to 1.0% for the value of relative refractive index difference with respect to the second clad is doped on the first core, which is at a ratio of 0.1 to 0.5% for the value of relative refractive index difference with respect to the second clad is doped on the second core as in the above, and the second clad is SiO2, which has a thickness from 1 mum or more to 40 mum or less.

Production of optical fibres

SINGLE MODE OPTICAL FIBER

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

ZERO DISPERSION STABLE SHIFT SINGLE MODE OPTICAL FIBER FOR THE SUB-WHOLE BAND

Dispersion-shifted fiber

LOW DISPERSION, LOW-LOSS SINGLE-MODE OPTICAL WAVEGUIDE

OPTICAL FIBRES

OPTICAL FIBER, OPTICAL FIBER COMPONENT AND OPTICAL TRANSMISSION METHOD

An optical fiber comprising a core and a cladding region which covers an outer periphery of the core, having a zero-dispersion wavelength in a wavelength range of 1.4 .mu. m to 1.65 .mu.m, and being in a single mode in that zero-dispersion wavelength, wherein GeO2 is doped in the core in a quantity such that a relative refractive index difference of the core becomes not less than 1.8%, the cladding region includes first, second, and third cladding regions, and a refractive index of the second cladding region is smaller than those of the first cladding region and the third cladding region.

FIBRE OPTIQUE EN UN SEUL MODE.

LA PRESENTE INVENTION CONCERNE UNE FIBRE OPTIQUE EN UN SEUL MODE. LA FIBRE OPTIQUE EST CARACTERISEE EN CE QU'ELLE COMPREND UN NOYAU CENTRAL1, UN NOYAU LATERAL2 DISPOSE SUR UN COTE EXTERNE DU NOYAU CENTRAL1 ET AYANT UN INDICE DE REFRACTION PLUS FAIBLE QUE CELUI DU NOYAU CENTRAL ET UNE PARTIE FORMANT GAINAGE3 DISPOSEE SUR UN COTE EXTERNE DU NOYAU LATERAL. LA PRESENTE INVENTION TROUVE APPLICATION DANS LE DOMAINE DES TRANSMISSIONS.

Single mode fibre optic cable index profiling construction; has V-shaped core profile index with outer core index rising above constant level outer sleeve index

L'invention concerne une fibre optique monomode à dispersion décalée, présentant une gaine avec un indice (n3) donné, et un coeur de fibre avec une partie centrale d'indice (n2) inférieur à celui de la gaine et une partie externe d'indice (n1) supérieur à celui de la gaine, et dont le profil d'indice présente au moins un flanc incliné. L'indice sur le flanc incliné est de préférence une fonction proportionnelle à rα , avec r le rayon, et l'exposant α un réel inférieur à 10. L'exposant peut être choisi entre 0, 80 et 1, 20.

DISPERSION SHIFTED SINGLE MODE OPTICAL FIBER AND ITS PRODUCTION

The dispersion shifted single mode optical fiber is manufactured by the stages of preparing a core member consisting of an inner core part made of a germanium-added quartz glass which optionally contains fluorine and an outer core made of a fluorineadded quratz glass having a refractive index smaller than that of the inner core part, making a glass tube made of a fluorine-added quartz galss having a refractive index smaller than that of the outer core part, inserting the core member into the glass tube, heating and fusing them together. Copyright 1997 KIPO ...

OPTICAL FIBER WITH LOW STIMULATED BRILLOUIN SCATTERING, AND OPTICAL TRANSMISSION LINE AND OPTICAL TRANSMISSION SYSTEM USING THE SAME

A single-mode optical fiber used in a signal transmission system and having an improved SBS (Stimulated Brillouin Scattering) threshold so as to transmit an analog signal having a particularly high power satisfactorily even under an environment having severe bending. This single-mode optical fiber includes a core region with a radius (rcore) from an optical center axis and a clad region surrounding the core region. The core region has a refractive index profile in which a specific refractive index difference (Δ) at the optical center axis is not equal to a specific refractive index (Δ2) at the radius (rcore) (Δ1≠ Δ 2). Here, Δ1 (%)=[(n I 2-nc 2)/2nI 2]x100, Δ2(%)= [(n2 2-nc 2)/2n2 2]x100, n1: a refractive index at the optical center axis, n2: a refractive index at the radius (rcore), nc: a refractive index of the clad region.

Low dispersion, low-loss single-mode optical waveguide

Disclosed is an optical waveguide fiber having a core (10, 12, 14) surrounded by a layer (16) of cladding material. The core is characterized in that it includes a region (14) of depressed refractive index. The inner radius ai of this region (14) is greater than zero, and the outer radius ao thereof is less than the core radius. By appropriately selecting the core index depression characteristics such as radial location, width, depth and shape, a fiber having the desired wave guide dispersion characteristics can be designed. Dispersion minimization over a wide wavelength range can be achieved, without adverse affect on system loss.

OPTISCHE FASER MIT DISPERSIONSVERSCHIEBUNG

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

A method of making an optical fibre with smooth annular ring refractive index profile comprises heating a clad quartz tube and supplying SiCl 4 GeCl 4 , and O 2 to deposit a core section inside the tube in a plurality of passes of decreasing temperature, decreasing SiCl 4 feed flow and increasing GeCl 4 feed flow.

OPTICL FIBRE FOR TO-THE-HOME DISTRIBUTION NETWORK

A network (100) for distributing signals to a plurality of user equipment (42) comprises a distribution unit (40), and a plurality of optical cables (1) adapted to make said distribution unit (40) communicate with said plurality of user equipment (42). In turn, each optical cable (1) comprises an optical fibre (10) having a core (14), a cladding (12) and a predetermined simple refractive index profile .DELTA.n(r). Each optical fibre (10) is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile .DELTA.n(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay .DELTA..tau. at 850 nm that is less than or equal to, about 1 ns/Km.

OPTICAL FIBER AND OPTICAL TRANSMISSION LINE

An optical fiber having a dispersion value of 6 to 24 ps/nm/km at 1.55 µm wavelength and satisfying the condition expressed by A > 3 x D + 40 where A (µm2) is the effective core cross section and D (ps/nm/km) is the dispersion value at the center wavelength in the 1.55 µm wavelength band. An optical transmission line comprising the optical fiber for transmitting an optical signal is also disclosed.

Method for manufacturing optical fiber

Monomode fibre optic cable for long distance transmissions

The fibre optic cable has a buried central fibre. The fibre has a central section which has a refraction index level ns. The layer is surrounded by a second layer having a refraction index of ns +h*dn, where h<1 and dn is a small change in refractive index, above the level ns. The second layer is in turn surrounded by a third layer with a refraction index o. This outer layer is surrounded by a sheath of refraction index n. The profile is optimum for a wavelength around 1.55 microns, over the monomode wide bandwidth.

Monomode optical fiber with offset dispersion

Monomode optical fibers with offset dispersion having an effective mode surface greater than 65 νm2 by optimization of the geometric parameters characteristic of these fibers. The refraction index as a 'U' or 'W' profile.

Optical fiber and method for making the same

An optical fiber has a section of the first kind having a chromatic dispersion not less than a given positive value x and a negative chromatic dispersion slope at a given wavelength and a section of the second kind has a chromatic dispersion not more than -x and a positive chromatic dispersion slope at the same wavelength. Another optical fiber has a chromatic dispersion higher than a positive value x and a negative chromatic dispersion slope at a given wavelength band.

LICHTWELLENLEITERFASER

LICHTWELLENLEITER AUF QUARZGLASBASIS UND VERFAHREN ZU SEINER HERSTELLUNG

Dispersion-shifted fiber

Dispersion-shifted fiber

SINGLE MODE OPTICAL FIBER

LOW DISPERSION, LOW-LOSS SINGLE-MODE OPTICAL WAVEGUIDE

STRUCTURED DOPED TELLURITE GLASS OPTICAL FIBER EXHIBITING CONTROLLED ZERO DISPERSION WITHIN A WAVELENGTH BAND CENTERED AT 1.55 MM

An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 µm, and a high nonlinear susceptibility .chi.3 equal to or greater than 1 x -12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 µm) , and to achieve large nonlinearity with a nonlinear coefficient .gamma. equal to or greater than 500W-1 km-1.

OPTICAL FIBER AND PRODUCTION METHOD THEREOF

An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 µm, and a high nonlinear susceptibility .CHI.3 equal to or greater than 1 × 10-12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having Strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 µm), and to achieve large nonlinearity with a nonlinear coefficient y equal to or greater than 500W-1 km- 1.

MONOMODE FIBEROPTIC HAS DISPERSION DECALEE

OPTICAL FIBER

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

DISPERSION-SHIFTED FIBER

The present invention relates to a dispersion-shifted fiber having a structure for effectively lowering polarization-mode dispersion. This dispersion-shifted fiber is a single-mode optical fiber mainly composed of silica glass and has a zero-dispersion wavelength set within the range of at least 1.4 µm but not longer than 1.7 µm. In particular, at least the whole core region of the dispersion-shifted fiber contains fluorine.

LOW LOSS SINGLE MODE FIBER WITH CHLORINE DOPED CORE

An optical fiber comprising: (i) a chlorine doped silica based core comprising a core alpha (α)>10, and maximum refractive index delta Δ% and Cl concentration >1 wt %; (ii) a cladding surrounding the core, the cladding comprising: (a) an inner cladding region adjacent to and in contact with the core and having a refractive index delta Δand a minimum refractive index delta Δsuch that Δ<Δ, the inner cladding region comprising fluorine doped silica and the refractive index delta Δwith region that decreases with radial position, and (b) an outer cladding region surrounding the inner cladding region and having refractive index delta Δ, such that Δ<Δ. The fiber has mode field diameter MFD at 1310 nm of ≧9 microns, a cable cutoff of ≦1260 nm, zero dispersion wavelength of 1300 nm≦zero dispersion wavelength ≦1324 nm and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn. 2. The optical fiber according to claim 1 , wherein the core alpha is at least 20.3. The optical fiber according to claim 1 , wherein the core alpha is at least 50.4. The optical fiber according to claim 1 , wherein the core alpha is at least 100.5. The optical fiber according to wherein the refractive index delta Δof the inner cladding region monotonically decreases radially claim 1 , towards the outer cladding region.6. The optical fiber according to wherein the core has an outer radius rand 3.0 micron≦r≦6.0 micron.7. The optical fiber according to claim 1 , wherein 3.3 micron≦r≦4.5 micron.8. The optical fiber according to claim 1 , wherein inner cladding region has a maximum refractive index delta Δ claim 1 , and wherein Δis <Δ.9. The optical fiber according to claim 1 , wherein the the inner cladding has a Trench Slope TS=(Δ−Δ)/(r−r) claim 1 , of 0.005% Δ/micron Подробнее

Single mode optical fiber with chlorine doped core and low bend loss

Single mode optical fibers with a chlorine doped core and a cladding having a fluorine doped trench region are disclosed. The optical fiber includes a chlorine doped silica core having a core alpha α≧10, a core radius r 1 and maximum refractive index delta Δ 1max % and a Cl concentration≧0.9 wt %. The optical fiber also has a cladding surrounding the core, the cladding having an inner and an outer cladding. The inner cladding has first and second cladding regions. The optical fiber has mode field diameter at 1310 nm of larger than 9 microns, a cable cutoff wavelength of ≦1260 nm, a zero dispersion wavelength λ 0 , where 1300 nm≦λ 0 ≦1324 nm, and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn.

Waveguides Incorporating Transmissive and Reflective Gratings and Related Methods of Manufacturing

Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic. 1. A waveguide display , comprising:a source of light modulated with an image data; and at least one transmission grating;', 'at least one reflection grating, wherein said at least one reflection gratin and said at least one transmission grating at least partially overlap; and', 'at least one input coupler for coupling light from said source of light into a total internal reflection (TIR) path in said waveguide., 'a waveguide comprising2. The waveguide display of claim 1 , wherein said at least one reflection grating and said at least one transmission grating are multiplexed in a single grating layer.3. The waveguide display of claim 1 , wherein said at least one input coupler is a grating.4. The waveguide display of claim 1 , wherein:said at least one input coupler comprises an input transmission grating;said at least one transmission grating comprises a fold transmission grating and an output transmission grating; andat least one of said input, fold, and output transmission gratings is multiplexed with said at least one reflection grating.5. ...

Waveguides Incorporating Transmissive and Reflective Gratings and Related Methods of Manufacturing

Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic. 1. A waveguide display , comprising:a source of light modulated with an image data; and at least one transmission grating;', 'at least one reflection grating, wherein said at least one reflection gratin and said at least one transmission grating at least partially overlap; and', 'at least one input coupler for coupling light from said source of light into a total internal reflection (TIR) path in said waveguide., 'a waveguide comprising2. The waveguide display of claim 1 , wherein said at least one reflection grating and said at least one transmission grating are multiplexed in a single grating layer.3. The waveguide display of claim 1 , wherein said at least one input coupler is a grating.4. The waveguide display of claim 1 , wherein:said at least one input coupler comprises an input transmission grating;said at least one transmission grating comprises a fold transmission grating and an output transmission grating; andat least one of said input, fold, and output transmission gratings is multiplexed with said at least one reflection grating.5. ...

Waveguides incorporating transmissive and reflective gratings and related methods of manufacturing

Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic.

透過格子および反射格子を組み込んだ導波路、ならびに関連する製造方法

多重化された反射および透過格子、ならびにそれらの製造方法が提供され、これらは、レーザー光の均一性を改善し、すなわち、導波路で発生する帯域固定および他の照射アーチファクトを低減する。このための機構は、導波路内のビーム伝播プロセスとして照射平均化を促進する、導波路反射表面と反射ホログラムとの間の複数の反射であり得る。いくつかの格子では、多重化格子と重なっているビームスプリッタ層が、レーザー照射された導波路における帯域固定を低減する目的のために提供され得る。ビームスプリッタは、１つ以上の誘電体層によって提供され得る。ビームスプリッタは、１つの偏光に対する感度を有することができる。ビームスプリッタは、Ｓ偏光を感知することができる。ビームスプリッタは、ガラスまたはプラスチックに浸漬されたときに高ＴＩＲ角度で反射する直角入射に最適化された反射防止コーティングであり得る。【選択図】図１

带透射光栅和反射光栅的波导及其生产方法

本发明提供了能够提高激光均匀性(即减少波导中出现的带斑及其他照明伪影)的复用反射和透射光栅及其生产方法。其原理为：作为波导内的束传播过程，波导反射面与反射全息图之间发生多重反射，从而促进照明平均化。在一些光栅中，为了减少激光照明波导中的带斑，可设置一个与复用光栅重叠的分束器层。可由一个或多个介电层提供所述分束器。并且所述分束器可对一种偏振敏感，即对S偏振敏感，其可以是一层经过法线入射优化的抗反射覆盖层，当将其浸入到玻璃或塑料中时，所述抗反射覆盖层具有高全内反射(TIR)角反射能力。

Dispersion-shifted fiber for optical parametric amplifier

본 발명은 파라메트릭 증폭기를 위한 분산천이 광섬유에 관한 것이다. The present invention relates to distributed transition optical fibers for parametric amplifiers. 본 발명이 이루고자 하는 기술적 과제는 파라메트릭 광증폭기에 적합한 실리카 기반의 광섬유로 비선형 계수가 크며 유효 면적(effective area)이 작은 파라메트릭 광증폭기를 위한 분산 천이 광섬유를 제공함에 있다. SUMMARY OF THE INVENTION An object of the present invention is to provide a dispersed transition optical fiber for a parametric optical amplifier having a large nonlinear coefficient and an effective area having a silica-based optical fiber suitable for a parametric optical amplifier. 본 발명이 이루고자 하는 또 다른 기술적 과제는 굽힘에 의한 손실 및 일반 단일 광섬유와의 접속시 발생하는 모드 필드 직경 차에 의한 접속 손실을 감소시킬 수 있는 파라메트릭 광증폭기를 위한 분산 천이 광섬유를 제공함에 있다. Another object of the present invention is to provide a distributed transition optical fiber for a parametric optical amplifier that can reduce the loss due to bending and the connection loss caused by the difference in mode field diameter generated when connecting with a single optical fiber. . 이를 위해 본 발명이 제공하는 파라메트릭 증폭기를 위한 분산천이 광섬유는 반지름이 매우 작으면서 굴절률이 높은 직사각형의 코어와 움푹 파인 클래드, 링이 있는 외부 클래드로 구성되어 있으며 코어와 내부 클래드 일부분에 중금속이 첨가되어 있다. To this end, the dispersion transition optical fiber for the parametric amplifier provided by the present invention is composed of a rectangular core having a very small radius and a high refractive index, a hollow cladding, and an outer cladding with a ring, and a heavy metal is added to a portion of the core and the inner cladding. It is.

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.

Single mode optical waveguide having large effective area

A single mode optical waveguide having large effective area is disclosed. The large effective area is achieved by using a segmented core profile design which includes at least one segment, or a part of one segment, having a refractive index less than the minimum refractive index of the clad layer. The large effective area serves to reduce or eliminate detrimental non-linear optical waveguide effects which limit regenerator spacing and bit rate. The large effective area is achieved while maintaining bend resistance at least as good as that of standard step index single mode waveguide fiber.

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.

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 ...

Dispersion shifted optical fiber

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。

Nonlinear optical fiber, optical fiber coil and wavelength converter

Low desperasion,low-lossingle-mode optical waveguide

The optical waveguide includs a core of transparent material having a max. refractive index R1 and a radius A, and a layer of transparent cladding material on the outer surface of the core, the refractive index n2 of the cladding amterial being less than n1. The core includes a region of depressed refractive index the inner radius Ai of this region being greater than zero and max. radius Ao of this region being less than A. Pref. the quantity (n1-n2)/(n1-n3) is not greater than about 2,0, where n3 is the min. refractive index of this region of depressed refractive index. By appropriately selecting the core index depressions charicteristics such as radial location, width, depth and shape, a waveguide haivng the desired dispersion characteristics can be designed.

Light conductive 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。

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。

Non-linear optical fiber, optical fiber coil, and wavelength converter

SINGLE-MODE TYPE OPTICAL WIRELESS

Low-loss single-mode optical fiber with chlorine doped core

光纤，包括：(i)基于氯掺杂二氧化硅的纤芯，其包括纤芯α，(α)>10，和最大折射率Δ(Δ 1最大值 ％)和Cl浓度>1重量％；(ii)围绕纤芯的包层，包层包含：(a)与纤芯相邻且接触的内包层区域，和具有折射率Δ(Δ 2 )和最小折射率Δ(Δ 2最小值 )，使得Δ 2最小值 <Δ 1最大值 ，内包层区域包含氟掺杂的二氧化硅和折射率Δ(Δ 2 )，具有随径向位置而减小的区域，和(b)围绕内包层区域的外包层区域，其具有折射率Δ(Δ 3 )，使得Δ 2最小值 <Δ 3 。光纤具有1310nm处≥9微米的模场直径MFD，光缆截止波长≤1260nm，零色散波长是1300nm≤零色散波长≤1324nm，和对于20mm心轴，1550nm处的弯曲损耗小于0.5dB/圈。

Optical waveguide fiber

Optical fiber and optical transmission line including the same

An optical fiber having a dispersion value of 6 to 24 ps/nm/km at 1.55 νm wavelength and satisfying the condition expressed by A ⊃ 3 x D + 40 where A (νm2) is the effective core cross section and D (ps/nm/km) is the dispersion value at the center wavelength in the 1.55 νm wavelength band. An optical transmission line comprising the optical fiber for transmitting an optical signal is also disclosed.

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.

Zero dispersion single mode optical fiber with center core and side core in the 1.5 μm wavelength region

A 1.5 μm zero dispersion single mode optical fiber comprising a center core, a side core disposed on an outer side of the center core and having a refractive index lower than that of the center core, and a cladding portion disposed on an outer side of the side core. Each of the refractive indices of the center core and the side core has a step-like profile in the direction of the radius of the optical fiber. The bending loss is low. The mode field diameter can be increased without deteriorating the bending loss, and the splice loss can be reduced. The chromatic dispersion varies only to a small extent with respect to changes in the core diameter, so that the zero dispersion wavelength can be well controlled.

SINGLE MODEM OPTICAL BODY GUIDE WITH LOW DISTRIBUTION AND LOW LOSS

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.

Optical waveguide with low attenuation

High sbs threshold optical fiber with aluminium dopant

An optical fiber comprising a core having a refractive index profile and a centerline; and a cladding layer surrounding and directly adjacent the core; wherein core includes updoping material and is doped with Aluminum in at least one region of the core, such that either: (a) the average longitudinal acoustic wave velocity within the core is within 0.05% of the longitudinal acoustic wave velocity within the cladding; or (b) the longitudinal acoustic wave velocity in the core changes by at least 0.2%.

High sbs threshold nzds optical fiber

A non-zero dispersion shifted optical waveguide fiber having a high threshold for stimulated Brillouin scattering is disclosed.

OPTICAL, SINGLE-MODE WAVE LEADER FIBER WITH LOW LOSS AND SMALL DISTRIBUTION

The core (19) is surrounded by a layer of cladding material (20) and includes a region (22) of depressed refractive index. The inner radius (ai) of this region (22) is greater than zero, and the outer radius (ao) thereof is less than the core radius (a). By appropriately selecting the core index depression (22) characteristics such as radial location, width, depth and shape, a fiber having the desired waveguide dispersion characteristics can be designed. Dispersion minimization over a wide wavelength range can be achieved, without adverse affect on system loss.

Optical fiber comprising a refractive index trench

A single mode optical fiber is disclosed. The refractive index profile of the fiber comprises a depressed-index or trench region in the cladding region. By suitable adjustment of the position, width and index of the trench region, one or more fiber characteristics can be improved, relative to a similar fiber that does not comprise an index trench.

OPTICAL VAOGLEDARE AV SINGULARFORM MED LAOG DISPERSION OCH SMAO FOERLUSTER.

Optical fiber

Non-linear optical fiber, optical fiber coil, and wavelength converter

A non-linear optical fiber capable of producing non-linear optical phenomena at high efficiency, an optical fiber coil composed of coiled non-linear optical fibers, and a wavelength converter provided with the non-linear optical fiber. The non-linear optical fiber in particular has characteristics for input light of a predetermined wavelength, which include a modal field diameter of 5 νm or less, a polarization dispersion of 1 ps/km1/2 or a constant plane of polarization, a zero-dispersion wavelength of 1.5 νm to 1.6 νm, a cutoff wavelength of 1.4 νm to 1.7 νm for a fiber length of 2 m, a transmission loss of 3 dB/km or less, and a non-linear coefficient of 10/W/km or higher. With this configuration the non-linear optical fiber can generate highly efficiently desired converted light by the non-linear phenomena.

Improved nonlinear optical fibre method of its production and use thereof

MONOMOD OPTICAL LEVEL WITH MEDICAL DISPERSION FOR DAEMPNING.

Optical fiber, optical fiber component and optical transmission method

An optical fiber comprising a core and a cladding region which covers an outer periphery of the core, having a zero-dispersion wavelength in a wavelength range of 1.4 μm to 1.65 μm, and being in a single mode in that zero-dispersion wavelength, wherein GeO 2 is doped in the core in a quantity such that a relative refractive index difference of the core becomes not less than 1.8%, the cladding region includes first, second, and third cladding regions, and a refractive index of the second cladding region is smaller than those of the first cladding region and the third cladding region.

Optical fiber and a method for manufactuirng same

There is prepared an optical fiber preform 2 whose core region is doped with Ge in such a quantity of dopant that the relative refractive-index difference [Ge] expressed in % with respect to pure SiO 2 satisfies the condition [Ge]≥0.3%, where upon after being heat drawn with a drawing furnace 11 into an optical fiber 3, the optical fiber 3 is annealed in a heating furnace 21 downstream of the drawing furnace 11 under a condition that the cooling speed is 2000°C/second or less, and the period of annealing time is equal to or longer than the relaxation time. Further, the annealed optical fiber 3 is introduced into a cooling means 31 at an entry temperature of 700°C or more, and the optical fiber 3 is forcibly cooled by the cooling means 31. As a consequence, there are achieved an optical fiber and a method of fabricating the same capable of fabricating the optical fiber having a reduced Rayleigh scattering loss as well as excellent hydrogen-resisting property with favorably high productivity.

Single mode optical waveguide

The core (19) is surrounded by a layer of cladding material (20) and includes a region (22) of depressed refractive index. The inner radius (ai) of this region (22) is greater than zero, and the outer radius (ao) thereof is less than the core radius (a). By appropriately selecting the core index depression (22) characteristics such as radial location, width, depth and shape, a fiber having the desired waveguide dispersion characteristics can be designed. Dispersion minimization over a wide wavelength range can be achieved, without adverse affect on system loss.

Waveguides incorporating transmissive and reflective gratings and related methods of manufacturing

High power acceptable optical fiber and fabrication method thereof

A high-power acceptable optical fiber comprises a core and cladding provided on the outer peripheral surface of the core. The dopant concentrations in the core and cladding each change in the axial direction of the optical fiber. The core has a same relative refractive index profile in any cross section thereof taken in a direction perpendicular to the axial direction thereof. The relative refractive index profile is normalized by a maximum refractive index of the core.

Optical transmission line

An optical transmission line according to the present invention is an optical transmission line which is able to control both the waveform distortion due to the non-linearity phenomenon and the waveform distortion due to dispersion. The optical transmission line is formed by connecting, in series, the first optical fiber ( 8 ), of which the dispersion value in the set wavelength band within the 1.5 μm wavelength band is 6 to 14 ps/nm/km, and the second optical fiber ( 9 ), of which the dispersion value in said set wavelength band is −14 to −6 ps/nm/km. The dispersion slopes of the first optical fiber ( 8 ) and the second optical fiber ( 9 ) are of mutually opposite symbols. Light transmitted from an optical transmitter ( 11 ) enters the first optical fiber ( 8 ) and light which has been transmitted through the first optical fiber ( 8 ) enters the second optical fiber ( 9 ). The absolute value of the dispersion in the 1.5 μm wavelength band of each of the optical fibers ( 8 ) and ( 9 ) is set to be 6 ps/nm/km or more so as to control the four light wave mixture and said absolute value is set to be 14 ps/nm/km or less so as to control a local dispersion, in order to set at approximately zero, for the entire optical transmission line, both the dispersion value and the dispersion slope in said set wavelength band.

Network for distributing signals to a plurality of user equipment

A network for distributing signals to a plurality of user having a distribution unit and a plurality of optical cables adapted to make the distribution unit communicate with the plurality of user equipment. In turn, each optical cable has an optical fibre having a core, a cladding and a predetermined simple refractive index profile Δn(r). Each optical fibre is adapted to guarantee a single-mode propagation at higher wavelengths than about 1260 nm and a few-mode propagation at about 850 nm, and each optical fibre has such refractive index profile Δn(r) as to guarantee macro-bending losses at 1550 nm that are less than about 0.5 dB and an intermodal delay Δτ at 850 nm that is less than or equal to, about 1 ns/Km.

Optical waveguide

Optical waveguide of the type comprising a core (10) presenting a refractive index (n1), maximal at least at its center; an optical cladding (20) involving core (10) and presenting a refractive index (n2) constant along its diametral extension and lower than the maximum refractive index (n1) of core (10) and further including a region defined by at least a stress-relieving intermediate portion (30) disposed between core (10) and the optical cladding (20), said intermediate portion presenting: a refractive index (n3), maximal along its diametral extension, at the maximum equal to the refractive index (n1) of core (10) and at least equal to refractive index (n2) of optical cladding (20), so as to provide an increase in the cutoff wavelength; a thermal expansion coefficient and a viscosity adequate to reduce the internal stress levels at least in core (10) of the optical waveguide to values which permit the obtention of acceptable attenuation and chromatic dispersion for a wavelength region.

Optical fibre

An optical fiber comprises a core region, an inner cladding region, and an outer cladding region. The core region, the inner cladding region, and the outer cladding region extend along the fiber axis. A relation of n1<n2<n0 is satisfied, where n0 is the average refractive index of the core region, n1 is the average refractive index of the inner cladding region, and n2 is the average refractive index of the outer cladding region. Three or more regions consisting of a secondary medium with a refractive index different from that of the primary medium that forms the inner cladding region extend along the fiber axis in the inner cladding region.

Optical fiber and production method thereof

An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 μm, and a high nonlinear susceptibility χ 3 equal to or greater than 1×10 −12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 μm), and to achieve large nonlinearity with a nonlinear coefficient γ equal to or greater than 500 W −1 km −1 .

Optical fiber and production method thereof

本发明提供一种光纤，由具有2微米以上的零材料分散波长的的碲化物玻璃形成，其特征在于：包括：纤芯区域；第一包层部，配置为包围所述纤芯区域，在该纤芯区域的周向具有多个沿该纤芯区域的轴方向的气孔；第二包层部，配置为包围所述第一包层部，具有与该第一包层部的等效折射率大致相等的折射率，通过所述纤芯区域和所述第一包层部的相对折射率差为2％以上，将零分散波长控制在作为通信波长频带的1.55微米。

OPTICAL FIBER

Optical fiber

Optical fiber and optical transmission system

An optical fiber includes a core and a cladding that surrounds the core. The optical fiber has a group index of 1.465 or less at a wavelength of 1550 nm and an absolute value of chromatic dispersion of 4 ps/nm/km or less at a wavelength of 1550 nm. A relative refractive index difference (Δ 0 ) between the core and pure silica ranges from -0.1% to 0.1%. The core includes a first core disposed at the center of the optical fiber and a second core surrounding the first core. A relative refractive index difference (Δ 1 ) between the first core and the cladding ranges from 0.6% to 0.9%. A relative refractive index difference (Δ 2 ) between the second core and the cladding ranges from 0.02% to 0.12%. The ratio of the diameter of the second core to the diameter of the first core ranges from 2.0 to 6.0.

Optical fiber and method for making the same

An optical fiber has a section of the first kind having a chromatic dispersion not less than a given positive value x and a negative chromatic dispersion slope at a given wavelength and a section of the second kind has a chromatic dispersion not more than −x and a positive chromatic dispersion slope at the same wavelength. Another optical fiber has a chromatic dispersion higher than a positive value x and a negative chromatic dispersion slope at a given wavelength band.

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。

Fiber optic for home distribution networks

Fibra óptica (10) que tiene un núcleo (14), un revestimiento (12) y un perfil de índice de refracción simple Δn(r),donde Δn(r) se refiere a la diferencia del índice de refracción entre el núcleo (14) y el revestimiento (12) como unafunción de la distancia radial r desde el eje longitudinal de la fibra óptica (10), estando dicha fibra óptica (10)adaptada para proporcionar una propagación de un solo modo en longitudes de onda mayores queaproximadamente 1260 nm, en la que: - el perfil de índice de refracción simple Δn(r) es del tipo beta que comprende una porción central que tieneun patrón del tipo super-gaussiano; una cola de difusión externa y, cuando la fibra óptica (10) se producecon un procedimiento de "deposición de vapor exterior" (OVD), una pequeña disminución en el centro delnúcleo (14); - la semi-área subtendida por la perfil del índice de refracción beta Δn(r) es mayor de 0,017 Δn*μm paraproporcionar pérdidas de macro-flexión a 1550 nm que son menores que aproximadamente 0,5 dB despuésde 100 vueltas sobre un mandril que tiene un diámetro de 60 mm, en el que la semi-área subtendida por elperfil del índice de refracción beta es un área determinada por la integración de Δn(r) con la variable rdesde cero a un valor radial correspondiente a una porción de revestimiento; caracterizada porque - la fibra óptica está adaptada para proporcionar una propagación de pocos modos en aproximadamente850 nm y tiene un valor de frecuencia normalizada V a 850 nm comprendido entre aproximadamente 2,85 y3,95 para proporcionar un retardo intermodal Δγa 850 nm que es menor o igual a aproximadamente 1ns/km. Fiber optic (10) having a core (14), a coating (12) and a simple refractive index profile Δn (r), where Δn (r) refers to the difference in the refractive index between the core (14 ) and the lining (12) as a function of the radial distance r from the longitudinal axis of the optical fiber (10), said optical fiber (10) being adapted to provide a single mode propagation at ...

Optical fiber and manufacturing method thereof

コア領域に純ＳｉＯ２に対する％で表した比屈折率差［Ｇｅ］が条件［Ｇｅ］≧０．３％を満たす添加量でＧｅが添加された光ファイバ母材２を準備し、線引炉１１で加熱線引して光ファイバ３とした後、線引炉１１の後段の熱処理炉２１において、冷却速度が２０００℃／秒以下、アニール時間が緩和時間以上となる条件で光ファイバ３をアニールする。さらに、アニールされた光ファイバ３を、冷却手段３１へと７００℃以上の入線温度で入線し、冷却手段３１によって光ファイバ３を強制冷却する。これにより、レイリー散乱損失が低減され、かつ、良好な耐水素特性を有する光ファイバを生産性良く製造することが可能な光ファイバ、及びその製造方法が実現される。 An optical fiber preform 2 is prepared in which Ge is added to the core region so that the relative refractive index difference [Ge] expressed as a percentage of pure SiO 2 satisfies the condition [Ge] ≧ 0.3%. Then, the optical fiber 3 is annealed under the conditions that the cooling rate is 2000 ° C./second or less and the annealing time is the relaxation time or longer in the heat treatment furnace 21 subsequent to the drawing furnace 11. . Further, the annealed optical fiber 3 enters the cooling means 31 at an incoming temperature of 700 ° C. or higher, and the optical fiber 3 is forcibly cooled by the cooling means 31. As a result, an optical fiber capable of producing an optical fiber having reduced Rayleigh scattering loss and good hydrogen resistance with high productivity and a method for producing the same are realized.

Double-Clad Optical Fibers And Devices With Double-Clad Optical Fibers

A double-clad optical fiber includes a core, an inner cladding and an outer cladding of silica-based glass. The core may have a radius of less than about 5 μm, a first index of refraction n 1 and does not contain any active rare-earth dopants. The inner cladding may surround the core and includes a radial thickness of at least about 25 μm, a numerical aperture of at least about 0.25, and a second index of refraction n 2 such that n 2 <n 1 . The relative refractive index percent (Δ %) of the core relative to the inner cladding may be greater than about 0.1%. The outer cladding may surround the inner cladding and include a radial thickness from about 10 pm to about 50 μm and a third index of refraction n 3 such that n 3 <n 2 . The relative refractive index percent (Δ %) of the inner cladding relative to the outer cladding may be greater than about 1.5%.

Optical fiber and a method for manufactuirng same

准备用相对纯SiO 2 的％表示的相对折射率差[Ge]满足条件[Ge]≥0.3％的添加量添加进了Ge的光纤母材2，在用拉线炉11加热拉制成线变成为光纤3后，在拉线炉11的后边的热处理炉21中，在冷却速度变成为2000℃/秒以下，退火时间变成为在缓和时间以上的条件下使光纤3退火。然后，使退火后的光纤3在700℃以上的温度下向冷却装置31送线，借助于冷却装置31使光纤3强制冷却。借助于此，就可以实现生产性良好地制造可以降低瑞利散射损耗，而且具有良好的耐氢特性的光纤、及其制造方法。

Waveguide optical fiber for amplification within s-band optical range

An optical waveguide fiber includes: a core region (12) having a relative refractive index percent within the range of from about 1.332% to about 1.628% and an outer radius within the range of from about 1.71 µm to about 2.09 µm; an inner clad layer (14) surrounding and in contact with the core region, the inner layer having a relative refractive index percent within the range of from about 1.30% to about 1.591% and an outer radius within the range of from about 4.41µm to about 5.39µm; an outer clad layer (16) surrounding and in contact with the inner clad layer, the outer clad layer having a relative refractive index within the range of from about 1.305% to about 1.595%. A second embodiment of the invention is also described.

Waveguides Incorporating Transmissive and Reflective Gratings and Related Methods of Manufacturing

Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic.

Waveguide optical fiber for parametric amplification within s-band optical range

An optical waveguide fiber including a core region having a relative refractive index percent and an outer radius. The optical waveguide fiber also includes an inner clad layer surrounding and in contact with the core region, the inner layer having a relative refractive index percent and an outer radius. The optical waveguide fiber further including an outer clad layer surrounding and in contact with the inner clad layer, the outer clad layer having a relative refractive index. The refractive index percent of the radii of the core region, the inner clad layer and the outer clad layer are chosen from the following ranges: the index of the core region within the range of from about 1.332 to about 1.628; the index of the inner clad layer within the range of from about 1.30 to about 1.591; the index of the outer clad layer within the range of from about 1.305 to about 1.595; the outer radius of the core region within the range of from about 1.71 μm to about 2.09 μm; and, the outer radius of the inner clad layer within the range of from about 4.41 μm to about 5.39 μm. In another embodiment, the refractive index percent and the radii of the core region, the inner clad layer and the outer clad layer are chosen from the following ranges: the index of the core region within the range of from about 1.338 to about 1.636; the index of the inner clad layer within the range of from about 1.307 to about 1.597; the index of the outer clad layer within the range of from about 1.311 to about 1.603; the outer radius of the core region within the range of from about 2.61 μm to about 3.19 μm; and, the outer radius of the inner clad layer within the range of from about 5.31 μm to about 6.49 μm.

Waveguide optical fiber for amplification within s-band optical range

An optical waveguide fiber includes: a core region (12) having a relative refractive index percent within the range of from about 1.332% to about 1.628% and an outer radius within the range of from about 1.71 µm to about 2.09 µm; an inner clad layer (14) surrounding and in contact with the core region, the inner layer having a relative refractive index percent within the range of from about 1.30% to about 1.591% and an outer radius within the range of from about 4.41µm to about 5.39µm; an outer clad layer (16) surrounding and in contact with the inner clad layer, the outer clad layer having a relative refractive index within the range of from about 1.305% to about 1.595%. A second embodiment of the invention is also described.

Optischer wellenleiter mit niedriger dämpfung

Single mode optical fiber with chlorine doped core and low bend loss

Single mode optical fibers with a chlorine doped core and a cladding having a fluorine doped trench region are disclosed. The optical fiber includes a chlorine doped silica core having a core alpha α ≥ 10, a core radius r 1 and maximum refractive index delta Δ 1max % and a Cl concentration ≥ 0.9 wt%. The optical fiber also has a cladding surrounding the core, the cladding having an inner and an outer cladding. The inner cladding has first and second cladding regions. The optical fiber has mode field diameter at 1310 nm of larger than 9 microns, a cable cutoff wavelength of ≤ 1260 nm, a zero dispersion wavelength λ 0 , where 1300 nm ≤ λ 0 ≤ 1324 nm, and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn.

塩素ドープコア及び小さな曲げ損失を備えるシングルモード光ファイバ

塩素ドープコアと、フッ素ドープトレンチ領域を有するクラッドとを備える、シングルモード光ファイバを開示する。上記光ファイバは、コアアルファα≧１０、コア半径ｒ１、最大屈折率デルタΔ１ｍａｘ及びＣｌ濃度≧０．９重量％を有する、塩素ドープシリカコアを含む。上記光ファイバはまた、上記コアを取り囲むクラッドを有し、上記クラッドは内側及び外側クラッドを有する。上記内側クラッドは、第１及び第２のクラッド領域を有する。上記光ファイバは：９マイクロメートル超の、１３１０ｎｍでのモードフィールド直径；≦１２６０ｎｍのケーブルカットオフ波長；１３００ｎｍ≦λ０≦１３２４ｎｍのゼロ分散波長λ０；及び０．５ｄＢ／ｔｕｒｎ未満の、２０ｍｍマンドレルに関する１５５０ｎｍでの曲げ損失を有する。

Optische faser mit dispersionsverschiebung

一种有一个中央波谷的色散位移单模光纤

本发明涉及一种有一个给定折射率(n 3 )的包层,一个有一个低于包层折射率的折射率(n 2 )的中心部分的光纤纤芯和一个高于包层折射率的折射率(n 1 )的外面部分的色散位移单模光纤,所述的光纤的折射率分布是这样的,它使纤芯的中心部分和外面部分通过一个倾斜的侧面相互连接起来,所述的光纤的特征在于折射率(n 2 )的中心部分的折射率分布是V形的。

Lichtwellenleiter auf quarzglasbasis und verfahren zu seiner herstellung

Rete di distribuzione di segnali ad una pluralita' di apparecchiatureutente.

광파이버용 모재 및 광파이버의 제조방법

싱글 모드 광파이버용 코어로드의 다공질 유리체를 탈수·유리화하여 싱글모드 광파이버 모재를 제조한다. 이 때, 광파이버용 모재를 선인하여 얻어지는 광파이버에서 광파이버용 코어로드에 상당하는 부분의 직경이, 파장 1.55㎛의 광을 통과한 직경의 모드 필드 직경의 1.9배 이상으로 되도록 하였다. 그 결과 구조 홈결의 영향이 적은 광파이버를 얻는 것이 가능한 싱글 모드 광파이버용 유리 모재가 제조될 수 있다.

Lichtwellenleiter auf quarzglasbasis und verfahren zu seiner herstellung

Die Erfindung betrifft einen Lichtwellenleiter (optische Faser) auf Quarzglasbasis mit verringerten inneren mechanischen Spannungen. Bei herkömmlichen Lichtwellenleitern sind die inneren mechanischen Spannungen hauptsächlich durch den Herstellungsprozess, nämlich einerseits durch die Differenz der linearen thermischen Ausdehnungskoefizienten von Kern- und Mantelmaterial bei der Abkühlung der Faser und andererseits durch das Ziehen selbst bedingt. Bei einem erfindungsgemässen Lichtwellenleiter ist die Differenz der linearen thermischen Ausdehnungskoeffizienten von Kern- und Mantelmaterial mittels geeigneter Dotierung von Kern- und/oder Mantelmaterial so gewählt, dass die inneren mechanischen Spannungen , welche durch die Abkühlung beim Herstellungsprozessbedingt sind, wesentlich verringert oder aufgehoben sind und/oder den durch das Ziehen verursachten Spannungen entgegenwirken. Die im Lichtwellenleiter vorliegenden inneren Spannungen sind somit erfindungsgemäss im Vergleich zu herkömmlichen Lichtwellenleitern insgesamt wesentlich verringert, minimiert oder aufgehoben. Vorteilhafte Auswirkungen hiervon sind die im Vergleich zu herkömmlichen Lichtwellenleitern niedrigere Dämpfung und verbesserten PMD-Werte.

광섬유 제조 방법

본 발명에 따른 광섬유는 1383㎚ 파장 대역에서 길이 방향에 따른 감쇄 손실의 불균일성은 0.05㏈/㎞이하이고, 감쇄 손실의 평균값은 0.35㏈/㎞이하이다. 광섬유, 광섬유 모재, 감쇄 손실

光纤及其制造方法

所披露的是一种具有衰减损耗的光纤的制造方法，其中，在1383nm的波长段内沿所述光纤纵向方向衰减损耗的不均匀性等于或小于0.05dB/km，并且，衰减损耗的平均值等于或小于0.35dB/km。所述方法包括步骤：(a)在将芯部表面的平均温度保持在等于或小于1000℃的水平、以及将根据烟灰预制棒生长长度的芯部表面温度变化保持在－10至10℃/cm范围内的同时制造烟灰预制棒；(b)通过脱水、固化和玻璃化所述烟灰预制棒来制造光纤预制棒；以及(c)在1900至2300℃之间的温度范围下，从所述光纤预制棒拉出光纤。

Waveguides incorporating transmissive and reflective gratings and related methods of manufacturing

Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic.

メトロ網用光ファイバー

【課題】 向上されたチャンネル効率を有し、経済的に形成でき、既存のメトロ網との高い互換性を備えた光ファイバーを提供する。 【解決手段】 光ファイバー３００は、第１の屈折率Ｎ １ を有する中心領域３２０と、中心領域３２０を取り囲み、第１の屈折率Ｎ １ よりも低い第２の屈折率Ｎ ２ を有する屈折率低下領域３３０と、を有するコア３１０と、コア３１０を取り囲み、第３の屈折率を有するクラッド３５０と、を具備する。光ファイバー３００は、ゼロ分散波長が１５５５ｎｍ以上で且つＬ−バンド以下の波長範囲に位置し、Ｃ−バンドで負の分散値を有し、Ｌ−バンドで正の分散値を有する。 【選択図】 図５Ｂ

光纤及其制造方法

本发明提供一种光纤，由具有2微米以上的零材料色散波长的碲化物玻璃形成，其特征在于：包括：纤芯区域；第一包层部，配置为包围所述纤芯区域，在该纤芯区域的周向具有多个沿该纤芯区域的轴方向的气孔；第二包层部，配置为包围所述第一包层部，具有与该第一包层部的等效折射率大致相等的折射率，通过所述纤芯区域和所述第一包层部的相对折射率差为2%以上，将零色散波长控制在作为通信波长频带的1.55微米。

光纤和包含光纤的光传输路径

本发明提供一种光纤，在1.55μm波长的色散值为11.2～17.8ps/nm/km，当把在1.55μm波长带的中心波长的色散值设为D(ps/nm/km)，把纤芯的有效面积设为A(μm2)时，满足A＞3×D+40。本发明还提供一种包含这种光纤的、用于传输光信号的光传输路径。