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61. 发明专利

JP2001021749A DISPERSION SHIFT OPTICAL FIBER 失效
公开(公告)号：JP2001021749A
公开(公告)日：2001-01-26
申请号：JP19824399
申请日：1999-07-12
申请人： FUJIKURA LTD
发明人： TANIGAWA SHOJI , MATSUO SHOICHIRO
IPC分类号： G02B6/02 , G02B6/036 , G02B6/16 , G02B6/22
摘要： PROBLEM TO BE SOLVED: To provide a dispersion shift optical fiber capable of enlarging an effective core cross-sectional area, capable of reducing a dispersion slope and having a refractive index distribution shape as simple as possible. SOLUTION: This dispersion shift optical fiber has a refractive index distributuion shape that a peripheral core part 2 having a refractive index higher than that of a center core part 1 is provided on an outer circumference of the center core part 1, and that a clad 4 having a refractive index lower than that of the peripheral core part 2 is provided on an outer circumference of the peripharal core part 2. An effective core cross-sectional areea is made to be 45-70 μm2, a wavelength dispersion value is made to be (-6)-(+6)ps/km/ nm, a dispersion slope is made to be 0.05-0.08 ps/km/nm2, a bending loss is made to be 100 dB/m or less, in a using wavelength band selected from 1490-1610 nm, and a cut-off wavelength is made to be included to form a substantially single mode propagation, so as to constitute this disperesion shift optical fiber.

62. 发明专利

JPH1062640A DISPERSION SHIFTED OPTICAL FIBER 失效
公开(公告)号：JPH1062640A
公开(公告)日：1998-03-06
申请号：JP21570796
申请日：1996-08-15
申请人： FUJIKURA LTD
发明人： MATSUO SHOICHIRO , YAMADA SHIGETOSHI , AZEBIRU TOMIO , TAKAHASHI KOICHI , YAMAUCHI RYOZO
IPC分类号： G02B6/02 , G02B6/036 , G02B6/16 , G02B6/22
摘要： PROBLEM TO BE SOLVED: To minimize nonlinear effect and bending loss by setting the effective sectional area and bending loss to specified ranges, and setting a cutoff wavelength to a value regularly forming single mode propagation. SOLUTION: A dispersion shifted optical fiber has a wavelength dispersion of substantially zero, in a used wavelength 1.55μm band, an effective sectionab. area Aeff of 70-120μm , a bending loss of 0.17-100dB m, and a cutoff wavelength having a value regularly forming single mode propagation. In order to have such characteristic values, it is necessary to have a refractive index distribution form (profile) in which an annular ring core part 12 having a low refractive index is formed on the outside of a central core part 11 apart from it. In this profile, when the diameter of the central core part 11 is 2a, the inside diameter of the ring core part 12 is 2b, and the width of the ring core part 12 is w, it is required to satisfy b/a>=1.5tie.5 and w/a>=0.5.

63. 发明专利

JPH0967130A APPARATUS FOR PRODUCING POROUS GLASS BODY 失效
公开(公告)号：JPH0967130A
公开(公告)日：1997-03-11
申请号：JP24245195
申请日：1995-08-28
申请人： FUJIKURA LTD
发明人： MATSUO SHOICHIRO , KAZUTAMA TETSUYA
IPC分类号： G02B6/00 , C03B8/04 , C03B19/14 , C03B37/014 , C03B37/018 , C03B37/07
摘要： PROBLEM TO BE SOLVED: To surely detect the occurrence of abnormality to crack a porous glass body during the production of this porous glass body by a VAD method even at the time of thermal shrinking without addition of a special device. SOLUTION: While a target rod 12 is rotated by a rotary pulling up device 13, this target rod is pulled up and the glass particulates formed from a burner 16, etc., are deposited at the bottom end thereof to form the porous glass body 11. The image near the bottom end of the porous glass body 11 is picked up by a TV camera 21 and the bottom end position thereof is detected by an image processor 22. The detection region for detecting this position is kept narrow at the stationary time but this detecting region is expanded to avoid overlooking of the cracked and fallen soot at the time of thermal shrinking, by which the abnormality is surely detected.

64. 发明专利

JPH0692670A APPARATUS FOR PRODUCING GLASS PREFORM 失效
公开(公告)号：JPH0692670A
公开(公告)日：1994-04-05
申请号：JP26966192
申请日：1992-09-11
申请人： FUJIKURA LTD
发明人： MATSUO SHOICHIRO , HARADA KOICHI
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To stably produce a glass preform having a specified weight of soot by improving the controllability of the deposited soot weight. CONSTITUTION:A holding table 41 holding burners 31,32 and a holding table 42 holding burners 33,34 are successively traversed to deposit soot 2 on a target member 1. Each time when each holding table reaches the traverse-starting position P1, the weight of the target member 1 having deposited soot 2 is measured by a load cell 6. When the measured result becomes close to the target weight, the traversing speed of the holding table to be traversed at the final stage and the number of burners to be operated on the holding table are controlled according to the difference between the target weight and the measured weight.

65. 发明专利

JPH04292377A LINEAR SUBSTANCE WINDING DEVICE 失效
公开(公告)号：JPH04292377A
公开(公告)日：1992-10-16
申请号：JP8349391
申请日：1991-03-21
申请人： FUJIKURA LTD
发明人： MATSUO SHOICHIRO , HARADA KOICHI , SUZUKI RYOJI
IPC分类号： B65H54/28
摘要： PURPOSE:To perform automatic regulation according to the winding state of a wound electric wire, etc., by detecting the position of the flange part of a bobbin by one of two kinds of photoelectric detectors, detecting the position of a linear substance by the detector, and controlling a turn-over position in a traverse direction according to detecting output from the detectors. CONSTITUTION:A bobbin 13 is moved along with rotation and axial movement of a rotary shaft. Through combination of photo beam projectors 21 and 22 and light receivers 31 and 32, the position of a flange part 14 of the traversing bobbin 13. A photo beam projector 23 has mirrors 24 the angles of which are regulated so that both of two photo beams enter a light receiver 33, and follow the position with an electric wire 11 therebetween. When a control device 34 decides it by signals from the light receivers 31, 32, and 33 and an angle signal from the mirror 24 that the electric wire 11 is moved to the side of the flange part 14, a rotation and traverse device 16 outputs a turn-over command. This constitution causes a traverse to turn over in an optimum position and performs winding of the electric wire 11 without the occurrence of winding disorder.

66. 发明专利

JPH04264405A MANUFACTURING DEVICE FOR COATED OPTICAL FIBER TAPE 失效
公开(公告)号：JPH04264405A
公开(公告)日：1992-09-21
申请号：JP4536291
申请日：1991-02-19
申请人： FUJIKURA LTD
发明人： HARADA HIKARI , SUZUKI RYOJI , MATSUO SHOICHIRO
IPC分类号： G02B6/04
摘要： PURPOSE:To prevent a surface from flawing by using rubbing ball type rolls as components which attract plural optical fibers to one another. CONSTITUTION:The rolls 4-10 which are in a cylindrical shape which is large in diameter at the center part and sectioned decreasing in diameter lengthwise gradually toward both ends, i.e., in a rubbing ball shape are arranged in front of a resin coating means 12 for fiber ribbon formation. When the optical fibers 1 pass in contact with the surfaces of the rolls 4-10, lateral forces are generated in the respective fibers 1 toward the centers where the diameter is large and the respective fibers 1 are automatically gathered. They while arrayed closely in the lateral direction are sent to the resin coating means 12, and resin is applied to the outer periphery and cured by a resin curing device 14.

67. 发明专利

JP2013210602A Method for connecting multicore fiber 有权
标题翻译：连接多光纤的方法
公开(公告)号：JP2013210602A
公开(公告)日：2013-10-10
申请号：JP2012267448
申请日：2012-12-06
申请人： Fujikura Ltd , 株式会社フジクラ
发明人： ARAKAWA YOKO , TAKENAGA KATSUHIRO , MATSUO SHOICHIRO
IPC分类号： G02B6/255 , G02B6/04
CPC分类号： B29C65/02 , G02B6/02042 , G02B6/2551
摘要： PROBLEM TO BE SOLVED: To provide a method for connecting multicore fibers for connecting a plurality of multicore fibers by suppressing variation in connection loss of the respective cores.SOLUTION: A method for connecting multicore fibers includes: a butting step of matching center axes of clads of the respective multicore fibers to each other to butt end faces of the respective multicore fibers so that the respective cores of one multicore fiber 1a and the respective cores of the other multicore fiber 1b face each other; and a fusion step of performing discharge by a pair of discharge electrodes 50a, 50b facing each other on both sides of the butted position of the respective multicore fibers to fuse the respective multicore fibers. The tips 51a, 51b of the respective discharge electrodes are reciprocated so that a straight line SL connecting the tips 51a, 51b of the discharge electrodes draw a surface perpendicular to the center axes to move, in the fusion step.
摘要翻译：要解决的问题：提供一种通过抑制各个核心的连接损耗的变化来连接多芯纤维连接多芯纤维的方法。解决方案：一种连接多芯光纤的方法包括：匹配夹层中心轴的对接步骤的相应多芯纤维彼此相对，以对接相应多芯纤维的端面，使得一个多芯纤维1a的各个芯和另一个多芯纤维1b的各个芯彼此面对; 以及通过在各个多芯光纤的对接位置的两侧彼此面对的一对放电电极50a，50b进行放电以熔合相应的多芯光纤的融合步骤。各个放电电极的尖端51a，51b往复运动，使得在熔融步骤中连接放电电极的尖端51a，51b的直线SL绘制垂直于中心轴线的表面以移动。

68. 发明专利

JP2012220311A Cutoff wavelength measurement method of optical fiber 有权
标题翻译：光纤的切割波长测量方法
公开(公告)号：JP2012220311A
公开(公告)日：2012-11-12
申请号：JP2011085520
申请日：2011-04-07
申请人： Fujikura Ltd , 株式会社フジクラ
发明人： SUGIMOTO YASUKO , MATSUO SHOICHIRO
IPC分类号： G01M11/02
CPC分类号： G01N21/84 , G01M11/33 , G02B6/02
摘要： PROBLEM TO BE SOLVED: To provide a cutoff wavelength measurement method with an increased degree of freedom in selection of a reference fiber, based on a single-mode fiber reference method.SOLUTION: A cutoff wavelength measurement method comprises: measuring wavelength characteristics of transmission light power of a reference fiber, and wavelength characteristics of transmission light power of a fiber 12 to be measured, respectively, using a single-mode fiber as the reference fiber 32; and calculating a cutoff wavelength of the fiber to be measured based on wavelength dependence of a ratio of the transmission light power of the fiber 12 to be measured to the transmission light power. A length of the reference fiber when measuring the transmission power of the reference fiber is longer than that of the fiber to be measured, and the length of the reference fiber is adjusted so as to propagate only a basic mode in an expected cutoff wavelength of the fiber to be measured.
摘要翻译：要解决的问题：基于单模光纤参考方法，提供具有提高参考光纤选择自由度的截止波长测量方法。解决方案：截止波长测量方法包括：使用单模光纤作为参考，分别测量参考光纤的透射光功率的波长特性和待测光纤12的透射光功率的波长特性纤维32; 并且根据所测量的光纤12的透射光功率与传输光功率的比率的波长依赖性来计算待测光纤的截止波长。在测量参考光纤的发射功率时，参考光纤的长度比待测光纤的长度被调节，并且参考光纤的长度被调整为仅传播预期的截止波长的基本模式要测量的纤维版权所有（C）2013，JPO＆INPIT

69. 发明专利

JP2012042389A Method of measuring distribution of bent loss in longitudinal direction of optical fiber and optical fiber line, method of testing optical line, and method of manufacturing optical fiber 有权
标题翻译：测量光纤和光纤线的纵向方向上的弯曲损耗分布的方法，测量光线的方法和制造光纤的方法
公开(公告)号：JP2012042389A
公开(公告)日：2012-03-01
申请号：JP2010185320
申请日：2010-08-20
申请人： Fujikura Ltd , Nippon Telegr & Teleph Corp , 日本電信電話株式会社 , 株式会社フジクラ
发明人： TANIGAWA SHOJI , ISHIDA ITARU , MATSUO SHOICHIRO , KURASHIMA TOSHIO , NAKAJIMA KAZUHIDE , SHIMIZU TOMOYA , MATSUI TAKASHI , GOTO YUKIHIRO
IPC分类号： G01M11/00
CPC分类号： G01M11/39 , G01M11/3145
摘要： PROBLEM TO BE SOLVED: To measure the distribution of bent loss in the longitudinal direction of an optical fiber by a bidirectional OTDR measuring method.SOLUTION: In the method for measuring the distribution of bent loss in the longitudinal direction of the optical fiber, an arithmetic mean value I(x) is calculated from two back-scattered light intensity values, on a position x, of two back-scattered light beams obtained by bidirectional OTDR measurement of the optical fiber, and a bent loss value is obtained from a mode field diameter 2W(x) and a relative refractive index difference Δ(x) on the position x, which are calculated from the arithmetic mean value I(x). When obtaining the bent loss value, it is preferable that the target optical fiber is regarded as an optical fiber having step type refractive index distribution equivalent to the refractive index distribution of the target optical fiber and the bent loss value on the position x is calculated from a relational expression of a standardized frequency V of the optical fiber having the step type refractive index distribution, a core radius (a) and a node field diameter 2W.
摘要翻译：要解决的问题：通过双向OTDR测量方法测量光纤的纵向弯曲损耗的分布。解决方案：在用于测量光纤纵向弯曲损耗分布的方法中，算术平均值I（x）由两个反向散射光强度值计算，位置x为2 从位置x上的模场直径2W（x）和相对折射率差Δ（x）获得的通过光纤的双向OTDR测量获得的背散射光束和弯曲损耗值，其从算术平均值I（x）。当获得弯曲损耗值时，优选将目标光纤视为具有与目标光纤的折射率分布相当的阶梯型折射率分布的光纤，并且从位置x计算弯曲损耗值具有阶梯型折射率分布的光纤的标准化频率V，芯半径（a）和节点场直径2W的关系表达式。版权所有（C）2012，JPO＆INPIT

70. 发明专利

JP2006154421A Single mode optical fiber, optical fiber cable, optical fiber cord and service life guaranteeing method of optical fiber 审中-公开
标题翻译：单模光纤，光纤电缆，光纤光栅和服务寿命保证光纤的方法
公开(公告)号：JP2006154421A
公开(公告)日：2006-06-15
申请号：JP2004346053
申请日：2004-11-30
申请人： Fujikura Ltd , 株式会社フジクラ
发明人： KUAMI HIROSHI , MATSUO SHOICHIRO , HIMENO KUNIHARU
IPC分类号： G02B6/02
CPC分类号： G02B6/0365 , G02B6/02
摘要： PROBLEM TO BE SOLVED: To provide a single mode optical fiber capable of detecting whether or not the fiber is layed appropriately by utilizing the increase in transmission loss when the fiber is bent to its limit. SOLUTION: In the single mode optical fiber having a cut-off wavelength in which it practically becomes single mode transmission in a wavelength 1.31μm band, a ratio refractive index difference of the core with respect to the clad is adjusted so that bent loss becomes greater than a detection limit value when bending is applied having a radius that is smaller than the optical fiber limit bending radius which is obtained from the relationship between the bending radius being applied to the optical fiber and the frequency of failure generated after a prescribed service life in the bent condition with the radius. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种单模光纤，其能够通过利用当光纤弯曲到其极限时传输损耗的增加来适当地检测光纤是否被布置。解决方案：在具有切割波长的单模光纤中，其实际上在波长1.31μm波段中实际上变为单模透射，调节芯相对于包层的折射率差的比例，使得弯曲当施加弯曲时，损失变得大于具有小于根据施加到光纤的弯曲半径与在规定的光纤之后产生的故障频率之间的关系而获得的光纤极限弯曲半径的半径的弯曲使用寿命在弯曲状态下具有半径。版权所有（C）2006，JPO＆NCIPI

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