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71. 发明专利

JPS63290913A MANUFACTURE OF OPTICAL FIBER ANGULAR VELOCITY METER 失效
公开(公告)号：JPS63290913A
公开(公告)日：1988-11-28
申请号：JP12575987
申请日：1987-05-25
申请人： HITACHI CABLE
发明人： KAJIOKA HIROSHI , TAKUMA TAKEYOSHI , SHIINA NORIBUMI , ISHIKAWA TOSHIHIKO
IPC分类号： G01C19/64 , G01C19/00 , G01C19/72 , G02B6/00
摘要： PURPOSE:To obtain high sensitivity and to reduce the drift and size of an optical fiber speed indicator by extending an optical fiber which forms a filer sensing loop and forming to a 1st directional in one body. CONSTITUTION:The 1st directional coupler 3 is formed integrally of the optical fiber 2 forming the fiber sensing loop nearby the fiber sensing loop 1. A polarizer 5 is connected to the direction coupler 3 through a splice 4and a 2nd directional coupling 7 is connected to the polarizer 5 through a splice 6. A light emitting element 10 and a light receiving element 11 are connected to this directional coupler 7 through splices 8 and 9 respectively. Consequently, the number of the splices is decreased.

72. 发明专利

JPS63159230A PRODUCTION OF OPTICAL FIBER PREFORM HAVING PRESERVED PLANE OF POLARIZATION 失效
公开(公告)号：JPS63159230A
公开(公告)日：1988-07-02
申请号：JP30517386
申请日：1986-12-23
申请人： HITACHI CABLE
发明人： YAMADA KIMIMICHI , NAKAMURA MASASHI , TAKUMA TAKEYOSHI , KAJIOKA HIROSHI
IPC分类号： G02B6/00 , C03B37/012 , G02B6/024 , G02B6/10
摘要： PURPOSE:To obtain the titled optical fiber preform having a refractive index distribution of high axial symmetry and preserved plane of polarization, by inserting a core rod with a clad of elliptical cross section into a quartz tube of the same shape so as to perpendicularly intersect major axes thereof, fusing and integrating the core rod and quartz tube. CONSTITUTION:A clad part 2 of a porous preform 3 for single mode optical fibers is ground by a grinder 4 to form both parallel sides 5 in the longitudinal direction. The resultant clad part 2 is then transparently vitrified to form a core rod 6 of elliptical cross section. The core rod 6 is inserted into a quartz tube 9 of elliptical cross section. Both are fused and integrated so as to intersect the major axes of both the above-mentioned core rod 6 and quartz tube 9.

73. 发明专利

JPS636843B2 失效
公开(公告)号：JPS636843B2
公开(公告)日：1988-02-12
申请号：JP5429283
申请日：1983-03-30
申请人： HITACHI CABLE
发明人： TAKUMA TAKEYOSHI , KAJIOKA HIROSHI
IPC分类号： C03B37/012 , C03C13/04 , G02B6/024 , G02B6/10

74. 发明专利

JPS62283842A PRODUCTION OF LOW-LOSS SINGLE MODE OPTICAL FIBER 失效
公开(公告)号：JPS62283842A
公开(公告)日：1987-12-09
申请号：JP12725286
申请日：1986-06-03
申请人： HITACHI CABLE
发明人： TAKUMA TAKEYOSHI , KAJIOKA HIROSHI , NAKAI HISANORI
IPC分类号： G02B6/00 , C03B37/02 , C03B37/025 , C03B37/027 , G02B6/02
摘要： PURPOSE:To obtain single mode optical fiber which is available for a long- distance optical transmission system and high-precision optical instrumentation system or the like and has extremely low transmission loss by thermally wire- drawing a base material consisting of a core rod inserted into a quartz pipe for a jacket under the specified conditions. CONSTITUTION:A base material obtained by inserting a core rod consisting of a core part and a cladding part into a quartz pipe for a jacket is introduced into a wire-drawing furnace and thermally wire-drawn while controlling it so as to satisfying the conditions of >=14 dV /2omega(mm/min) [(d) is outer diameter (unit mu) of cladding, V is feed velocity (unit mm/min) of base material and 2omega is diameter (unit mu) of mode field], and >=20g wire-drawing tension.

75. 发明专利

JPS62283304A ABSOLUTE SINGLE POLARIZING PLANE MAINTAINING OPTICAL FIBER 失效
公开(公告)号：JPS62283304A
公开(公告)日：1987-12-09
申请号：JP12466486
申请日：1986-05-31
申请人： HITACHI CABLE
发明人： TAKUMA TAKEYOSHI , KAJIOKA HIROSHI , KUMAGAI TATSUYA
IPC分类号： G02B6/024 , G02B6/10
摘要： PURPOSE:To provide the titled optical fiber which exhibits the absolute single polarizing plane maintaining characteristic even if the fiber is not bent by using a support having the refractive index equal to the refractive index of a clad and determining the refractive index distribution of an elliptical jacket in such a manner that the refractive index lower than the refractive index of the clad in the minor axis direction and has the further lower refractive index in the major axis direction. CONSTITUTION:The elliptical jacket 3 provided to the outside peripheral part of the clad 3 consists of SiO2 glass added with P2O5 and B2O5 and has a large coefft. of thermal expansion. The amt. of the B2O3 to be added is large in the minor axis direction (Y-axis direction) and the jacket has the refractive index n1t lower than the refractive index n0 of the clad 2 in said direction. The amt. of the B2O3 to be added is further larger in the major axis direction (X-axis direction) and the jacket has the refractive index n1c lower than the refractive index n1t in the minor axis direction. The fiber exhibiting the absolute single polarizing plane maintaining characteristic to propagate only the polarization mode in the single direction even if the fiber is not bent is thus realized.

76. 发明专利

JPS62283303A ABSOLUTE SINGLE POLARIZING PLANE MAINTAINING OPTICAL FIBER 失效
公开(公告)号：JPS62283303A
公开(公告)日：1987-12-09
申请号：JP12466386
申请日：1986-05-31
申请人： HITACHI CABLE
发明人： TAKUMA TAKEYOSHI , KAJIOKA HIROSHI , KUMAGAI TATSUYA
IPC分类号： G02B6/024 , G02B6/10
摘要： PURPOSE:To provide the titled optical fiber which exhibits the absolute single polarizing plane maintaining characteristic even if the fiber is not bent by using a support having the refractive index equal to the refractive index of a clad and determining the refractive index distribution of an elliptical jacket in such a manner that the refractive index is equal in the minor axis direction and has the low refractive index in the major axis direction. CONSTITUTION:The elliptical jacket 3 consists of SiO2 glass added with P2O5 and B2O3 and has a large coefft. of thermal expansion. The amt. of the B2O3 to be added is large in the major axis direction (X-axis direction) thereof and the jacket has the refractive index n1 lower than the refractive index n0 of the clad 2 in said direction. The jacket has the refractive index n0 equal to the refractive index of the clad 2 in the minor axis (Y-axis direction). The fiber exhibiting the absolute single polarizing plane maintaining characteristic to propagate only the polarization mode in the single direction is thus obtd. even if the fiber is not bent.

77. 发明专利

JPS62159005A MEASURING METHOD FOR LENGTH OF OPTICAL FIBER 失效
公开(公告)号：JPS62159005A
公开(公告)日：1987-07-15
申请号：JP94486
申请日：1986-01-07
申请人： HITACHI CABLE
发明人： KUMAGAI TATSUYA , KAJIOKA HIROSHI , TAKUMA TAKEYOSHI
IPC分类号： G01B11/02 , G01M11/00
摘要： PURPOSE:To execute a measurement with a high accuracy by a simple device in a short time by measuring a phase difference in case of an optical fiber to be measured of a long size, and a phase difference in case of this fiber of a short size, which has been cut short by fixing an electro-optical converting side, and deriving its difference. CONSTITUTION:An electro-optical converter 2, and an optical-electric converter 3 are provided on one end of an optical fiber 1, and the other end, respectively. The converter 2 converts a sine wave electric signal for modulation from an oscillator 4 to a sine wave optical signal, and converts a sine wave optical signal emitted from its other end to a sine wave electric signal. This sine wave electrical signal is inputted to a phase meter 5, also, the sine wave electric signal which has been generated in the oscillator 4 is also inputted to the phase meter 5, and a phase difference of the sine wave electrical signal of a phase phi1 from the oscillator and the sine wave electrical signal of a phase phi2 from the converter 3 is detected by the phase meter 5. By the way, length of a fiber to be measured can be derived by measuring a phase difference in case of the optical fiber to be measured 1 of a long size, and a phase difference of the optical fiber 1 of a short size, which has been cut short by fixing the converter side 2, and deriving its difference.

78. 发明专利

JPS6285836A DETECTING METHOD FOR ABNORMAL POINT DURING DRAWING OF OPTICAL FIBER WIRE 失效
公开(公告)号：JPS6285836A
公开(公告)日：1987-04-20
申请号：JP22739385
申请日：1985-10-11
申请人： HITACHI CABLE
发明人： KAJIOKA HIROSHI , TAKUMA TAKEYOSHI , KUMAGAI TATSUYA , NAKAI HISANORI , TAKASHIMA HIDEYUKI
IPC分类号： G02B6/00 , C03B37/12 , G01M11/00
摘要： PURPOSE:To detect the abnormal point of a drawn optical fiber precisely by arranging an optical fiber for abnormal point detection nearby the drawn optical fiber, collecting the scattered component of in-electric-furnace light propagated in the drawn optical fiber through the optical fiber for abnormal point detection, and detecting the scattered component by a photodetector. CONSTITUTION:A preform 1 for an optical fiber is heated in an electric furnace 8 and an optical fiber 1a is drawn. The optical fiber 12 for abnormal point detection is arranged nearby the drawn optical fiber 1a and the scattered component of the in-electric-furnace light propagated in the drawn optical fiber 1a is collected through the optical fiber 12 for detection, detected by the photodetector 13, and further recorded on a recorder 14. This optical fiber 12 for detection uses a flexible optical fiber to arrange the photodetector 13 and recorder at distance from the electric furnace 8. so that the abnormal point of the drawn optical fiber 1a is detected precisely.

79. 发明专利

JPS6265529A DECENTRALIZATION COMPENSATION METHOD FOR OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPS6265529A
公开(公告)日：1987-03-24
申请号：JP20506285
申请日：1985-09-17
申请人： HITACHI CABLE
发明人： KAJIOKA HIROSHI , TAKUMA TAKEYOSHI , KUMAGAI TATSUYA
IPC分类号： G02B6/00 , G02B6/02 , H04B3/04 , H04B10/00 , H04B10/2507 , H04B10/2513
摘要： PURPOSE:To increase remarkably the transmission capacity by inserting a single mode optical fiber for compensation decentralized with a prescribed length to control the decentralization in the entire optical fiber transmission line between a light source and a transmission long optical fiber or between the transmission long optical fiber and a light receiver. CONSTITUTION:One end of a decentralization compensation single mode optical fiber 3 is coupled directly with an electrooptic converter 2 and the other end is connected to an optical fiber cable 5 by a connection section 4. As the decentralization compensation single mode optical fiber, a high NA single mode optical fiber, a W type single mode optical fiber or a multi-clad single mode optical fiber or a triangle core single mode optical fiber, etc., are used and a polarized plane preserving optical fiber is used as well. In inserting the decentralization compensation single mode optical fiber 3, even when a conventional multi-mode laser is used, since the transmission capacity is increased nearly as semi-infinitely practically, the system is very effective to a wide band.

80. 发明专利

JPS6247607A OPTICAL FIBER TYPE POLARIZER 失效
公开(公告)号：JPS6247607A
公开(公告)日：1987-03-02
申请号：JP18774685
申请日：1985-08-27
申请人： HITACHI CABLE
发明人： TAKUMA TAKEYOSHI , KUMAGAI TATSUYA , FURUKAWA SAKAE , KAJIOKA HIROSHI , TOKUNAGA TOSHIHIDE , YAMADA KIMIMICHI
IPC分类号： G02B6/024 , G02B6/02 , G02B6/10
摘要： PURPOSE:To obtain a polarizer which has a high quenching ratio and is easily manufactured and handled by forming a polarization plane maintaining optical fiber in a coil shape. CONSTITUTION:The polarization plane maintaining optical fiber consists of a core 1, a clad 2, an elliptic jacket 3, and a support 4; the refractive index of the core 1 is large in an (x) direction, the refractive index of the elliptic jacket 3 is small, and the clad 2 and support 4 have intermediate values between them. Only the refractive index of the core 1 is small in a (y) direction and the refractive indexes of the clad 2, jacket 3, and support 4 are uniformly small. Consequently, the cutoff wavelength of an (x) polarized wave is longer than that of a (y) polarized wave and when the fiber is formed in a coil shape, the (y) polarized wave has large loss and only the (x) polarized wave becomes an absolute single wave. Consequently, the optical fiber type polarizer which has a high quenching ratio and small restrictions of environmental condition and is easily to handle is obtained.

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