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41. 发明专利

JP2002228871A POLARIZATION MAINTAINING OPTICAL FIBER COUPLER 失效
公开(公告)号：JP2002228871A
公开(公告)日：2002-08-14
申请号：JP2001024951
申请日：2001-01-31
申请人： FUJIKURA LTD
发明人： MATSUMOTO RYOKICHI , SASAKI HIDEKI
IPC分类号： G02B6/024 , G02B6/28 , G02B6/17
摘要： PROBLEM TO BE SOLVED: To provide a technology for obtaining a polarization maintaining optical fiber coupler which ensures a polarized wave beam splitter operation. SOLUTION: In the polarization maintaining optical fiber coupler in which a welded and drawn part 3 is formed by juxtaposing two polarization maintaining optical fibers (PANDA type optical fibers 10 and 10), heating a portion of the longitudinal direction, and extending to the longitudinal direction, an aspect ratio which is the ratio of the maximum outside diameter (b) to the minimum outside diameter (a) of the cross section at the center of the longitudinal direction of the welded and drawn part 3 is made into 1.7 or more.

42. 发明专利

JP2000221359A SHOCK-RESISTANT OPTICAL FIBER MODULE 失效
公开(公告)号：JP2000221359A
公开(公告)日：2000-08-11
申请号：JP2080999
申请日：1999-01-28
申请人： FUJIKURA LTD
发明人： MATSUMOTO RYOKICHI , NISHIDE KENJI , YAMAUCHI RYOZO
IPC分类号： G02B6/26
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber module with improved shock resistance characteristics. SOLUTION: The shock-resistant optical fiber is produced by housing an optical fiber in a first module case 3, housing the first module case 3 in a second module case 13 and fully filling the space between the outer wall of the first module case 3 and the inner wall of the second module case 13 with a synthetic resin 15 to form a shock buffer layer 15a. The Young's modulus of the synthetic resin 15 is =0.2 mm thickness.

43. 发明专利

JPH1123889A OPTICAL FIBER REINFORCEMENT UNIT AND OPTICAL FIBER REINFORCING STRUCTURE 失效
公开(公告)号：JPH1123889A
公开(公告)日：1999-01-29
申请号：JP18287697
申请日：1997-07-08
申请人： FUJIKURA LTD
发明人： MATSUMOTO RYOKICHI , NISHIDE KENJI , SUZUKI FUMIO , YAMAUCHI RYOZO
IPC分类号： G02B6/28
摘要： PROBLEM TO BE SOLVED: To provide the optical fiber reinforcement unit and optical fiber reinforcing structure wherein a bare optical fiber part hardly contacts the internal wall of the reinforcement unit even if vibration or a shock is applied to improve the mechanical reliability as a reinforcing structure which reinforces an optical fiber whose bare fiber part such as an optical fiber coupler is exposed. SOLUTION: The tail end parts of clad layers 11a and 12a of the optical fiber coupler and part of a glass fiber part 1B are fixed to both end fixation parts 23a of a reinforcement base 23 with adhesives 26 and 26 to position the optical branching and coupling part 1A of the optical fiber coupler on the recessed part 23b of the reinforcement base 23 which is further fixed in a sheath 33.

44. 发明专利

JPH09318837A OPTICAL FIBER TYPE COUPLER 失效
公开(公告)号：JPH09318837A
公开(公告)日：1997-12-12
申请号：JP13020796
申请日：1996-05-24
申请人： FUJIKURA LTD
发明人： MATSUMOTO RYOKICHI , AZEBIRU TOMIO , SUZUKI FUMIO , YAMAUCHI RYOZO
IPC分类号： G02B6/28 , G02B6/02 , G02B6/10 , G02B6/287
摘要： PROBLEM TO BE SOLVED: To completely and surely reduce reflection at an unnecessary port and to stably obtain a large reflection attenuation quantity by covering the cut surface of a cut port with transparent resin and covering the transparent resin with opaque resin. SOLUTION: An optical branching/coupling part 14 formed by fusing and drawing two optical fibers is housed in a reinforcing device 15, ports 1 to 3 and the unnecessary port 4 are extended, and the port 4 is at a position near to the device 15. The cut surface of the port 4 is covered with the transparent resin 20, and further the resin 20 is covered with the opaque resin 21. The transparent resin whose light transmissivity of the used wavelength band of a coupler is >=80% and whose refractive index is approximate to that of glass constituting the optical fiber is used as the resin 20. The resin 21 is constituted of the resin whose attenuation quantity of the light in the used wavelength band of the coupler and the external light is 30dB and which has appropriate elasticity to cover and protect the port 4 and the port 3 adjacent to the port 4.

45. 发明专利

JPH09105832A OPTICAL FIBER TYPE COUPLER 失效
公开(公告)号：JPH09105832A
公开(公告)日：1997-04-22
申请号：JP26411695
申请日：1995-10-12
申请人： FUJIKURA LTD
发明人： MATSUMOTO RYOKICHI , AZEBIRU TOMIO , SUZUKI FUMIO , YAMAUCHI RYOZO
IPC分类号： G02B6/28
摘要： PROBLEM TO BE SOLVED: To prevent temperature characteristics of an optical fiber type coupler, constituted by storing a coupler main body composed of an optical branching and coupling part and glass fiber parts on both its sides in a reinforcing unit, from deteriorating owing to the state wherein the coefficient of linear expansion of an adhesive for fixing the coupler main body to the reinforcing unit is larger than that of the coupler main body. SOLUTION: The coupler main body 1 consisting of the optical branching and coupling part 2 and the glass fiber parts 3 on both its sides is stored in the reinforcing unit 6, the glass fiber parts 3 are fixed to the internal wall of the reinforcing unit 6 with the adhesive 5, and the reinforcing unit 6 is formed of a material which has a larger coefficient of linear expansion than the coupler main body 1.

46. 发明专利

JPH09105831A MANUFACTURE OF OPTICAL FIBER COUPLER 失效
公开(公告)号：JPH09105831A
公开(公告)日：1997-04-22
申请号：JP26184095
申请日：1995-10-09
申请人： FUJIKURA LTD
发明人： YAMAZAKI SHIGEFUMI , SUZUKI FUMIO , YAMAUCHI RYOZO , MATSUMOTO RYOKICHI
IPC分类号： G02B6/28
摘要： PROBLEM TO BE SOLVED: To prevent a bare optical fiber from being damaged by bringing bare optical fibers into contact with each other without applying any external force directly to the bare optical fibers when a fusion drawing type optical fiber coupler is manufactured. SOLUTION: A 1st optical fiber 1 which has its bare optical fiber 11 exposed at a halfway part and a 2nd optical fiber 2 and a 3rd optical fiber 3 which have their bare optical fibers 12 and 13 exposed at their one-end parts are used; and the 2nd optical fiber 2 is arranged in parallel to one end side of the 1st optical fiber 1 and the 3rd optical fiber 3 is arranged in parallel to the other end side of the 1st optical fiber 1 in transarrangement with the 2nd optical fiber 2 across the 1st optical fiber, and the part where the three bare optical fibers 11, 12, and 13 are parallel is heated, fused, and drawn.

47. 发明专利

JPH08220373A OPTICAL FIBER TYPE STAR COUPLER AND ITS PRODUCTION 失效
公开(公告)号：JPH08220373A
公开(公告)日：1996-08-30
申请号：JP2845695
申请日：1995-02-16
申请人： FUJIKURA LTD
发明人： YAMAUCHI RYOZO , SUZUKI FUMIO , NISHIDE KENJI , MATSUMOTO RYOKICHI
IPC分类号： G02B6/287 , G02B6/28
摘要： PURPOSE: To obtain a star coupler which is small in size and is capable of efficiently maintaining light transmission efficiency by providing an optical type star coupler with a fusion stretched part where the intermediate bare fiber parts formed by removing the coatings of the intermediate parts of coated fibers of optical ribbons are gathered against each other to form contact parts and the contact parts are fusion stretched. CONSTITUTION: This optical fiber type star coupler 10 is a star coupler of a fusion stretching type consisting of the coated fiber of optical ribbons 12 in which plural pieces of the bare optical fibers 11... are built. The coated fiber of ribbons 12 are formed with the intermediate bare fiber parts 13 from which the coatings of the intermediate parts are removed. The optical fiber type star coupler 10 is formed with the fusion stretched part 15 where the intermediate bare fiber parts 13 are gathered against each other to form the contact parts and the contact parts are fusion stretched. The number of the bare optical fibers 11 to be built in the coated fiber ribbons 12 is arbitrary, insofar as plural pieces of the coated optical fibers 11 are built therein.

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