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11. 发明专利

JPH04163807A OPTICAL FIBER COMPOSITE AERIAL GROUND WIRE 失效
公开(公告)号：JPH04163807A
公开(公告)日：1992-06-09
申请号：JP29030690
申请日：1990-10-26
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： OTA JUNICHI
IPC分类号： G02B6/44 , H01B7/17 , H01B7/18 , H01B11/22
摘要： PURPOSE:To suppress temperature rising and to prevent erosion and deformation by forming a spacer with a uniform insulating material in an optical fiber composite aerial ground wire having a spacer which holds the optical fibers in spiral grooves of the circumference. CONSTITUTION:Multiple grooves 2 are provided spirally in the circumference of a spacer 1 to hold optical fibers in the grooves. The outer circumference of the spacer 1 is covered by an aluminum pipe 4, then aluminum covering steel wires 5 are twisted to cover the pipe to form an optical fiber composite aerial ground wire. The spacer 1 can be formed by using uniform materials such as polycarbonate, polyether sulphone, polyether ketone and the like. Even a short-circuit current flows through the aerial ground wire, therefore heating of the spacer 1 is suppressed, decomposition of the optical fiber cover is prevented and erosion due to influence of electric field can be prevented.

12. 发明专利

JPH03231205A STRESS-IMPARTED OPTICAL FIBER FOR SENSOR 失效
公开(公告)号：JPH03231205A
公开(公告)日：1991-10-15
申请号：JP2619890
申请日：1990-02-07
申请人： SUMITOMO ELECTRIC INDUSTRIES , OSAKA GAS CO LTD
发明人： WAKAMI TOSHINORI , OTA JUNICHI , INAMURA EIICHI , NAKAYAMA KATSUYOSHI
IPC分类号： G01D5/353 , G01D5/26 , G01L1/24 , G02B6/02 , G02B6/036
摘要： PURPOSE:To arrange many sensors close to one another by providing a first core having a higher refractive index than a clad and a second core having a higher refractive index than the first core. CONSTITUTION:A measuring device 3 for detecting light transmission loss is positioned at one end of an optical fiber 4, and a sensor part 5 as the detection part is set in the middle of the optical fiber 4. A clad 8 forms the periphery of the optical fiber 4, an injection core 6 made of a material having a higher refractive index than the clad 8 is formed, and a detection core 7 made of a material having a higher refractive index is formed in parallel with the injection core 6. Consequently, the dead zone generated by the turbulence of an optical waveguide mode is shortened, and hence the sensor parts 5 are set close to one another.

13. 发明专利

JPH10301002A OPTICAL FIBER FLAT TYPE CABLE 失效
公开(公告)号：JPH10301002A
公开(公告)日：1998-11-13
申请号：JP11202297
申请日：1997-04-30
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： SANO HIROAKI , OTA JUNICHI , HAMADA KAZUAKI , ISHIKAWA HIROKI , NIIYAMA SHINSUKE , HOKARI KAZUO , FURUKAWA SHINICHI
IPC分类号： G02B6/44
摘要： PROBLEM TO BE SOLVED: To easily separate and take a coated optical fiber or optical cord out of a flat type cable formed by integral coating on the coated optical fiber core or the optical cord and tension members. SOLUTION: Respectively one or more pieces of the tension members 2 and arrayed in parallel on both sides of the coated optical fiber core 1 or the optical cord and these members are integrally coated with the coating 3 of the flat type consisting of a plastic resin. The surfaces of the coatings 3 apart from each other on both sides of the plane (Y-Y' plane) which is perpendicular to the plane (X-X' plane) running the central axes of the coated optical fiber core 1 or the optical cord and the tension members 2 and passes the center axis of the coated optical fiber 1 or the optical cord are provided with notches 4, 4' not facing each other continuously in a longitudinal direction across the coated optical fiber core 1 of the optical cord.

14. 发明专利

JPH10160987A OPTICAL FIBER UNIT AND OPTICAL CABLE 失效
公开(公告)号：JPH10160987A
公开(公告)日：1998-06-19
申请号：JP32128496
申请日：1996-12-02
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： SUETSUGU YOSHIYUKI , OTA JUNICHI , AIHARA KATSUYUKI , ISHIKAWA HIROKI , TANAKA SHIGERU , SANO HIROAKI , HOKARI KAZUO , FURUKAWA SHINICHI
IPC分类号： G02B6/44
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber unit having excellent workability for intermediate post branching and an optical cable formed by using the unit. SOLUTION: The optical fiber unit (A) is constituted by twisting four pieces of coated optical fibers 1 provided with coatings or longitudinally placing these coated fibers, integrating fibers, arranging the coated fibers approximately point symmetrically and forming an internal resin layer 2 by a solid resin material. The optical fiber unit (B) is provided with an external resin layer and the solid resin is packed into the clearances facing the outside of the adjacent coated optical fibers 1, by which the external resin layer 3 is formed. The resin is packed to the extent of not exceeding a circumcircle 4 or tangent 5. The resin adheres locally on the surfaces of the coating of the coated optical fibers, thereby coupling the coated optical fibers 1 to each other.

15. 发明专利

JPH08304676A SELF-SUPPORTING TYPE OPTICAL CABLE 失效
公开(公告)号：JPH08304676A
公开(公告)日：1996-11-22
申请号：JP11050995
申请日：1995-05-09
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： ISHIKAWA HIROKI , SANO HIROAKI , TANAKA SHIGERU , NIRASAWA NOBUMASA , MORITA KENJI , OTA JUNICHI
IPC分类号： G02B6/44
摘要： PURPOSE: To provide a self-supporting type optical cable which prevents the elongation and increase in transmission loss of coated optical fibers. CONSTITUTION: Supporting wires 3 and an optical cable core 4 are covered and integrated with a common sheath 5 continuous in a longitudinal direction. The length in the longitudinal direction of a neck part 5a changes periodically in the longitudinal direction of the self-supporting type optical cable and, therefore, the optical cable core 4 has an extra length to the supporting wires 3 in a tensionless state. The part of the neck part 5a is easily deformed and the distance between the cable core and the supporting wires 3 changes in the state of applying the tension on these wires and, therefore, the occurrence of elongation and distortion in the optical cable core 4 and the application of a compressive stress thereon do not arise. Then, the coated optical fibers 6 do not elongate and meander within the slots of the optical cable core 4 regardless of before or after the impression of the tension.

16. 发明专利

JPH06201955A OPTICAL UNIT AND OPTICAL CABLE 失效
公开(公告)号：JPH06201955A
公开(公告)日：1994-07-22
申请号：JP50193
申请日：1993-01-06
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： KUNO SATOSHI , OTA JUNICHI , SATANI HIROSHI , MASAMI YUUICHI , SAITO KOJI
IPC分类号： G02B6/44
摘要： PURPOSE:To house optical fibers at a high density by arranging these fibers on a tensile wire having a resin layer having a prescribed Young's modulus formed on its outer periphery and providing this resin layer or resin tape thereon. CONSTITUTION:The optical unit is constituted of the tensile wire 1 on the outer periphery of which the resin coating layer 2 is formed, the optical fibers 3 which are placed longitudinally on this wire or spirally wound thereon and the resin coating body 4 which fix the respective fibers. A glass fiber reinforced plastic or steel wire etc., which have a high mechanical strength and are stable to temp., etc., are used for the tensile wire 1 in such a case. The optical unit 5 is formed by using the resin having Young's modulus for the coating layer 2 and the resin coating body 3 and has 35 to 120mum thickness of the thin layer. The resin of the coating layer 2 and the coating body 3 is preferably a polyamide resin or fluororesin and the m.p. of the thermosetting or UV-curing type resin is preferably >=150 deg..

17. 发明专利

JPH03220505A OPTICAL FIBER STRESS PROVIDING SENSOR 失效
公开(公告)号：JPH03220505A
公开(公告)日：1991-09-27
申请号：JP1499190
申请日：1990-01-26
申请人： SUMITOMO ELECTRIC INDUSTRIES , OSAKA GAS CO LTD
发明人： OTA JUNICHI , WAKAMI TOSHINORI , INAMURA EIICHI , NAKAYAMA KATSUYOSHI
IPC分类号： G01D5/353 , G01D5/26 , G01L1/24 , G02B6/02 , G02B6/036
摘要： PURPOSE:To reduce the propagation of high-order modes by providing a 1st core which forms the center part of an optical fiber, a 2nd core which has a lower refractive index than the 1st core, and a clad which has a lower refractive index than the 2nd core. CONSTITUTION:In a sensor part 5 which is stressed to deform, light pulses sent in the optical fiber 4 from the side of an OTDR 3 cause backward scattering to generate optical transmission loss. Consequently, reflected light from the sensor part 5 to the OTDR 3 is reduced and the stress in the sensor part 5 can be detected by the OTDR 3. Namely, the 1st core 6, 2nd core 7, and clad 8 vary in refractive index stepwise, so the difference in refractive index between the 2nd core 7 and clad 8 becomes small and the high-order mode which enters the clad 8 from the 2nd core 7 as the backward scattered light is generated becomes easy to enter the side of the 2nd core 7 again. Consequently, the attenuation of the high-order modes in the optical fiber 4 becomes extremely large.

18. 发明专利

JPH03220504A OPTICAL FIBER STRESS PROVIDING SENSOR 失效
公开(公告)号：JPH03220504A
公开(公告)日：1991-09-27
申请号：JP1499090
申请日：1990-01-26
申请人： SUMITOMO ELECTRIC INDUSTRIES , OSAKA GAS CO LTD
发明人： OTA JUNICHI , WAKAMI TOSHINORI , INAMURA EIICHI , NAKAYAMA KATSUYOSHI
IPC分类号： G01D5/353 , G01D5/26 , G01L1/24 , G02B6/02 , G02B6/036 , G02B6/22
摘要： PURPOSE:To make the influence of high-order modes small by providing a 1st clad which has a less refractive index smaller than a core and a 2nd clad which has a higher refractive index than the 1st clad. CONSTITUTION:In a sensor part 5 which is stressed to deform, light pulses sent in an optical fiber 4 from the side of an OTDR 3 generate backward scattered light to generate optical transmission loss. Consequently, reflected light from the sensor part 5 to the OTDR 3 is reduced and the stress in the sensor part 5 can be detected by the OTDR 3. Namely, the refracting index n2 of the material forming the 2nd clad 8 is larger than that of the 1st clad 7 and less than that of the core 6, so the high-order mode which enters the 1st clad 7 from the core 6 as the backward scattered light is generated becomes easy to enter the side of the 2nd clad 8. Consequently, the attenuation of the high- order mode in the optical fiber 4 becomes extremely large.

19. 发明专利

JPH03211505A OPTICAL FIBER 失效
公开(公告)号：JPH03211505A
公开(公告)日：1991-09-17
申请号：JP731590
申请日：1990-01-17
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： KANAMORI HIROO , TAKAGI MASAHIRO , OTA JUNICHI , WAKAMI TOSHINORI , KUBO YUJI
IPC分类号： G01N19/10 , G01L1/24 , G02B6/00 , G02B6/02
摘要： PURPOSE:To obtain a sufficient detection sensitivity by providing a reflecting part having the effect of reflecting the leakage light by bending of the optical fiber in the region of a clad part. CONSTITUTION:While the reflecting part 13 is formed concentrically with the core part 11, this part is disposed in the position where the light propagating in the core part 11 is substantially not affected in the state of not applying the bending for the purpose of sensing to the optical fiber. The leakage light from the core part by the bending is reflected by the reflecting part 13 when the optical fiber is bent. A part of the reflected light propagates again in the core part 11 and a part thereof appears as backward scattered light in an OTDR wave form as signal light. The reflecting part is disposed as the concentrical reflecting layer with the core part, by which arbitrariness is imparted to the bending direction of the optical fiber. The leakage light by the bending is efficiently measured as the reflected light by the OTDR and the optical fiber effective for a detecting system of the condition at multiple points is obtd.

20. 发明专利

JPH03210458A OPTICAL FIBER SENSOR 失效
公开(公告)号：JPH03210458A
公开(公告)日：1991-09-13
申请号：JP473490
申请日：1990-01-13
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： WAKAMI TOSHINORI , OTA JUNICHI
IPC分类号： G01N21/17
摘要： PURPOSE:To detect the data of many points by providing a coupling optical fiber and a splitting optical fiber and allowing pulse light to be incident from one end of the coupling optical fiber to observe a change in the quantity of reflection of the splitting optical fiber as the emitted from the incident end of the coupling optical fiber. CONSTITUTION:A plurality of light splitters 3 are connected in series by coupling optical fibers 2 and splitting optical fibers 4 having open ends are connected to one ends of the light splitters and the end surface of each of the fibers 4 is present in oil 5 having a refractive index almost equal to that of the core part of each optical fiber 4 and a reflecting mirror 6 is arranged to the bottom part of the oil 5. The end surfaces of the splitting optical fibers 4 come into contact with the reflecting mirrors 6 or separate therefrom in connection with the movement of the drive parts 7 and the quantities of the reflected lights from the reflecting mirrors change and the movement of the drive parts 7 can be detected on the basis of a change in the quantities of reflection.

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