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1. 发明专利

JPH06123818A DEVICE FOR CONNECTING MULTIPLE COATED OPTICAL FIBER 失效
公开(公告)号：JPH06123818A
公开(公告)日：1994-05-06
申请号：JP916993
申请日：1993-01-22
申请人： NIPPON TELEGRAPH & TELEPHONE , OJIMA SHISAKU KENKYUSHO KK
发明人： AOSHIMA SHINICHI , YABUTA TETSUO , YOSHIZAWA NOBUYUKI , ASHITANI FUMIHIRO , SHIMONAKA MASARU , NODA KAZUFUSA
IPC分类号： G02B6/26 , G02B6/08 , G02B6/255
摘要： PURPOSE:To provide a connecting device for a multiple coated optical fiber which is compact and enables the individual optical fibers of the multiple coated optical fiber to be aligned individually with high precision. CONSTITUTION:The connecting device for multiple coated optical fibers is equipped with a V-groove substrate 10 where the coated optical fibers are held in V-shaped grooves 10A at specific intervals, a base 11 which holes an optical fiber supporting member 13, where a groove 13A having slanting surface matching the V grooves 10A and holding the fiber tip parts are formed, in a finely movable state, a fine adjustment member 14 which finely moves the optical fiber supporting member 14 in two-dimensional direction, an axis deviation quantity measuring instrument 31, and a means 32 which controls the driving of the fine adjustment member 14 so that the axes are aligned according to an axis deviation quantity.

2. 发明专利

JPH0534550A MULTIFIBER CONNECTOR FOR OPTICAL FIBERCABLE 失效
公开(公告)号：JPH0534550A
公开(公告)日：1993-02-12
申请号：JP21157391
申请日：1991-07-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAGASAWA SHINJI , ASHITANI FUMIHIRO , SATAKE TOSHIAKI
IPC分类号： G02B6/02 , G02B6/10 , G02B6/38 , G02B6/40
摘要： PURPOSE:To eliminate the need of a refractive index matching agent and to improve the attaching detaching operability, and also, to obtain a connection characteristic of a low reflection and a low loss by bringing each optical fiber connecting end face into contact obliquely and directly with each other at the time of connecting each plug. CONSTITUTION:A connecting end face 16 of a plastic formed plug 14 becomes the inclined surface incled at a larger angle - or + than a total reflection critical angle of a propagation light in an optical fiber from the face being orthogonal to an axis of the optical fiber 2. The optical fiber 2 is fixed by having a small projection amount DELTAL in parallel to the connecting end face 16 on which its connecting end face is inclined. Connection of the plugs 14 and 14' is connected by inserting a pair of guide pins 6 into a pin insertion hole 15 of one plug 14', inserting the plugs 14, 14' from both sides of a guide sleeve 17 and butting them, fitting in a crank spring 7 and pressurizing it in the axial direction. In this case, the inside diameter dimension of the guide sleeve 17 is a little larger than the outside diameter dimension of the plug terminal (tip) part.

3. 发明专利

JPH02230222A METHOD FOR COMPRESSING AND AMPLIFYING OPTICAL PULSE 失效
公开(公告)号：JPH02230222A
公开(公告)日：1990-09-12
申请号：JP5006489
申请日：1989-03-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ASHITANI FUMIHIRO
IPC分类号： G02F1/35 , H01S3/06 , H01S3/10
摘要： PURPOSE:To enable the waveform compression and intensity amplification of a signal optical pulse with small-sized, simple constitution by making a signal optical pulse and an exciting optical pulse incident on an optical fiber for compression and compressing the pulse width of the signal optical pulse, and making it incident on an optical fiber to which rare earth elements are added and amplifying the signal optical pulse. CONSTITUTION:The optical fiber 7 for signal optical pulse compression is interposed between the terminal 3B of an optical coupler 3 and the erbium-added optical fiber 2, its one terminal is connected to a terminal B, and the other terminal is connected to one end of the erbium-added optical fiber 2. Then the signal optical pulse and exciting optical pulse are made incident on the optical fiber 7 for compression at the same time, the signal optical pulse has a chirp by non-linear optical effect caused by the exciting optical pulse, and the pulse width of the signal optical pulse is compressed by the effect of abnormal dispersion. Then the compressed signal optical pulse and exciting light pulse are made incident on the optical fiber 2 to which rare earth elements are added and the signal optical pulse is amplified by excited amplification effect caused by erbium. Consequently, the signal optical pulse can be relayed by the device of small-sized, simple constitution.

4. 发明专利

JPS61167911A OPTICAL CONVERSION CONNECTOR 失效
公开(公告)号：JPS61167911A
公开(公告)日：1986-07-29
申请号：JP861885
申请日：1985-01-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ASHITANI FUMIHIRO , NAGASAWA SHINJI , SATAKE TOSHIAKI
IPC分类号： G02B6/24 , G02B6/38 , G02B6/40
摘要： PURPOSE:To reduce the size of a connector by connecting a terminal for multicore batch connection and a terminal for single-core connection smoothly through plural optical fibers, and molding the whole out of plastic resin. CONSTITUTION:The terminal 7 for multicore batch connection and fitting pins 9 for multicore batch connector connection which secure multicore batch connecting operation are provided on one end surface, the terminal 6 for single- core connection, a housing clamping part 10 for single-core optical connector connection, and a sleeve 11 for single-core optical connector core connection are provided on the other end surface, and the whole is stored in a housing 13. Bare fibers 12 connected to the left-side terminal 7 for multicore batch connection are converted in array pitch by a fiber pitch conversion part 8 in the optical conversion connector so that single-core lines 2 as prolongations of the bare fibers are connected smoothly to right-side terminals 6 for single-core connection. Consequently, the small-sized optical conversion connector which connects a tape core to plural single-core cores is easily realized.

5. 发明专利

JPS61156207A METHOD FOR POLISHING OPTICAL CONNECTOR 失效
公开(公告)号：JPS61156207A
公开(公告)日：1986-07-15
申请号：JP27972884
申请日：1984-12-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIKAWA IZUMI , NAGASAWA SHINJI , ASHITANI FUMIHIRO , SATAKE TOSHIAKI
IPC分类号： B24B19/00 , B24B19/22 , G02B6/24 , G02B6/25 , G02B6/38
摘要： PURPOSE:To form a high-quality mirror surface at the end face of a core by short-time treatment, by contacting the end face of the core, into which an optical fiber is inserted and fixed, with a polishing liquid mixed with polishing powder of hardness lower than that of the core on a rotating polishing board. CONSTITUTION:A core 6, into which the core 5 of an optical fiber is inserted and fixed, is supported with an arm 1 and the end face of the core 6 is polished by pouring a polishing liquid 7 from a nozzle 4 onto a supporting material 2 and rotating a polishing saucer 3. The polishing effect is achieved in a short time by setting the contacting speed of the polishing liquid 7 containing 5&n30wt% of free polishing powder of hardness lower than that of the optical fiber 5 with the supporting material 2 of hardness lower than that of the polishing powder at 400&n600m/min. Moreover, since the polishing dust is buried in the lower-hardness supporting material 2 or scattered away, no polishing scratches a reproduced on the end face of the optical fiber 5. Therefore, the end face of the core 6 can be polished to a smooth mirror surface at a high speed.

6. 发明专利

JPS60235032A MEASUREMENT OF CONNECTION LOSS OF OPTICAL FIBER 失效
公开(公告)号：JPS60235032A
公开(公告)日：1985-11-21
申请号：JP9047884
申请日：1984-05-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SATOU MAKOTO , TACHIKURA MASAO , ASHITANI FUMIHIRO
IPC分类号： G01M11/02 , G01M11/00 , G02B6/00
摘要： PURPOSE:To enhance the efficiency of measuring work, by exciting two optical fibers in the vicinity of the connection point thereof to emit lights and respectively measuring the intensities of lights transmitting through optical fibers in the other side while calculating the connection loss from both measured results. CONSTITUTION:In the vicinity of the connection part 3 of upper and lower side optical fibers 1, 2, a Ge-atom is excited at first by irradiating the bare fiber 1a of an optical fiber 1 with ultraviolet or infrared rays 5 from a projector 4 to emit light and the light propagated to the fiber 2 is received by the light receiver 6 arranged to the bent part 2b of the fiber 2 to measure the intensity of leaked light. Next, the rays 5 are allowed to irradiate the bare fiber 2a of the other fiber 2 to similarly measure the intensity of the leaked light by the light receiver 6 and the connection loss is calculated from the ratio of both measured values. By this method, measurement becomes possible only on the connection work site.

7. 发明专利

JPS54786A SEABED COAXIAL CABLE 失效
公开(公告)号：JPS54786A
公开(公告)日：1979-01-06
申请号：JP6570477
申请日：1977-06-06
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ASHITANI FUMIHIRO , FURUKAWA SHINICHI
IPC分类号： H01P3/06 , H01B11/18
摘要： PURPOSE:To form the insulated substance by alternately laminating the insulating material having the temperature coefficient opposite to each other and tangential with dielectric curve and to suppress variations of temperature coefficient on attenuation to frequency.

8. 发明专利

JPH0475011A OPTICAL FIBER CABLE 失效
公开(公告)号：JPH0475011A
公开(公告)日：1992-03-10
申请号：JP19159090
申请日：1990-07-17
申请人： TOKAI RUBBER IND LTD , NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： UMEDA MASANARI , SAKURABA YUKIO , ASHITANI FUMIHIRO , MATSUO TOSHINOBU
IPC分类号： G02B6/44
摘要： PURPOSE:To obtain the cable which is simple in construction, can be easily produced and can effectively exhibit the waterproof effect even with the infiltration of the sea water by sticking or impregnating a specific water absorptive material compsn. on or in a sheet-shaped based material, thereby constituting the water absorptive tape of a water absorptive tape layer for retaining winding. CONSTITUTION:The special water absorptive tape 6a for retaining winding is disposed between a sheath 7 of the cable and a slot 2. This water absorptive tape 6a for retaining winding is made into the two-layered structure consisting of a water absorptive tape compsn. layer 21 and a base material layer 22. This water absorptive material compsn. is constituted by compounding a thermoplastic elastomer A component, a highly water absorptive resin B component and a surface treating agent C component. The ratios of using the components A to C are set at the ratios of 10 to 300 pts. B component and 0.1 to 10 ptcs. C component per 100 pts. A component. The construction is simplified and the production is facilitated in this way. The waterproof effect of the water absorptive tape 6a for retaining winding is sufficiently exhibited even for the sea water.

9. 发明专利

JPH0475009A OPTICAL FIBER CABLE 失效
公开(公告)号：JPH0475009A
公开(公告)日：1992-03-10
申请号：JP19158890
申请日：1990-07-17
申请人： TOKAI RUBBER IND LTD , NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： UMEDA MASANARI , SAKURABA YUKIO , ASHITANI FUMIHIRO , MATSUO TOSHINOBU
IPC分类号： G02B6/44
摘要： PURPOSE:To obtain the cable which is simple in construction, can be easily produced and can effectively exhibit the waterproof effect even with permeating of the sea water by sticking a specific water absorptive material compsn. on a sheet-shaped base material, thereby constituting the water absorptive tape of a water absorptive tape layer for retaining winding. CONSTITUTION:The special water absorptive tape 6a for retaining winding is disposed between a sheath 7 of the cable and a slot 2. This water absorptive tape 6a for retaining winding is made into the two-layered structure consisting of a water absorptive tape compsn. layer 21 and a base material layer 22. This water absorptive material compsn. is constituted by compounding a thermoplastsic elastomer A component, a highly water absorptive resin B component and a water-soluble resin C component and compounding a surfactant D component at need. The ratios of using the components A to D are set at the ratios of 10 to 300 pts. B component, 5 to 100 pts. C component and 1 to 50 pts. D component per 100 pts. wt. A component. The construction is simplified and the production is facilitated in this way. The waterproof effect of the water absorptive tape 6a for retaining winding is sufficiently exhibited even for the sea water.

10. 发明专利

JPS6035885B2 失效
公开(公告)号：JPS6035885B2
公开(公告)日：1985-08-17
申请号：JP15541277
申请日：1977-12-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FURUKAWA SHINICHI , ASHITANI FUMIHIRO , MATSUMOTO TOSHIAKI
IPC分类号： G02B6/00 , H02G15/02 , H02G15/08 , H02G15/14

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