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1. 发明专利

JPS63189025A SWITCHING CIRCUIT FOR FEEDER PATH 失效
公开(公告)号：JPS63189025A
公开(公告)日：1988-08-04
申请号：JP2045887
申请日：1987-02-02
申请人： FUJITSU LTD , KOKUSAI DENSHIN DENWA CO LTD , NEC CORP
发明人： INOUE YOSHIYUKI , TAKAHASHI MASAAKI , TACHIKURA KOICHI , NISHIKAWA HITOSHI , OTA HAJIME , KOGURE YOSHIICHI
IPC分类号： H04B3/44
摘要： PURPOSE:To prohibit the switching of a relay contact in a state where a high voltage is impressed, by switching the feeder path which performs feeding to a repeater, etc., to double end feeding or single end feeding, and connecting a relay so as not to change a feeding connection state when a fault occurs. CONSTITUTION:The double end feeding is performed between a first feeder 1 and a second feeder 2, and the single end feeding is performed by a third feeder 3. In such a state, when a current ceases to flow on the relay K1 due to the fault of the feeder line 6 or the feeder line 7, the relay contact k1 is restored, but since the current of single end feeding flows on the relay K4, an operating state can be held by a self-holding contact k4-1. Therefore, a contact k4-2 is set an opened state, and it follows that no high voltage is impressed on the contact k1 of the relay K1, and no arc discharge is generated.

2. 发明专利

JPS6011321B2 失效
公开(公告)号：JPS6011321B2
公开(公告)日：1985-03-25
申请号：JP589781
申请日：1981-01-20
申请人： KOKUSAI DENSHIN DENWA CO LTD
发明人： YAMAZAKI YOSHIHIKO , EJIRI YOSHIHIRO , NUNOKAWA MAKOTO , YAMAMOTO HITOSHI , TACHIKURA KOICHI , FURUSAWA KAHEI
IPC分类号： G02B6/24 , G02B6/44 , H02G15/08 , H02G15/14

3. 发明专利

JPS6339224A SWITCHING AND BRANCHING SYSTEM FOR OPTICAL FIBER CABLE 失效
公开(公告)号：JPS6339224A
公开(公告)日：1988-02-19
申请号：JP18268786
申请日：1986-08-05
申请人： KOKUSAI DENSHIN DENWA CO LTD
发明人： TANAKA MASATO , TACHIKURA KOICHI
IPC分类号： H04B10/03 , H04B10/27 , H04B10/29
摘要： PURPOSE:To substantially reduce losses supplied to a main optical signal and the leakage of an auxiliary optical signal by connecting optical switches to both ends of switching transmission lines and inserting one beam splitter with the branching ratio of a communication transmission line >> control circuit at least to one branching station. CONSTITUTION:The optical switches 2-5, 2-6, 2-7 and 2-8 are connected to both ends of the switching transmission lines 5-5 and 5-6. The beam splitter 3-5 whose branching ratio meets the communication transmission line >> the control. circuit is inserted to the branching station C. Since only the beam splitter 3-5 with a high branching ratio and two optical switches 2-6 and 2-7 are inserted to the communication transmission line serving as a line that branches a control signal to the control circuit 4, the losses of the inputted main optical signal are substantially improved. As for light leakage to the communication transmission line A5 or B6 from the switching transmission line 5-5 or 5-6 in normal communications, light leaking from the optical switch 2-6 is connected to the off side of the optical switch 2-5 through the switching transmission line 5-5. Therefore, light leaking to the communication transmission line A5 can be almost completely blocked in a two-staged off state.

4. 发明专利

JPH1032546A OPTICAL TRANSMISSION SYSTEM AND OPTICAL DISTRIBUTER 失效
公开(公告)号：JPH1032546A
公开(公告)日：1998-02-03
申请号：JP18954796
申请日：1996-07-18
申请人： K D D KAITEI CABLE SYST KK , KOKUSAI DENSHIN DENWA CO LTD
发明人： TACHIKURA KOICHI , GOTO KOJI , NORIMATSU NAOKI , YAMAMOTO SHU
IPC分类号： H04B10/00 , H04B10/07 , H04B10/27 , H04B10/278 , H04B10/29 , H04B10/297 , H04J14/00 , H04J14/02 , H04B10/22 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To facilitate the maintenance and to allow the system to flexibly cope with fluctuation in traffic. SOLUTION: A wavelength band subject to wavelength division multiplex is divided into a plurality of wavelength bands (such as wavelength bands L, M, H and a wavelength band EX among trunk stations each having one wavelength or over. Each of optical distributers 18-1-18-6 to connect each of distribution stations 16-1-16-4 to a trunk cable 14 is provided with an add/drop element adding/dropping a wavelength band assigned to the connected distribution stations 16-1-16-4. In addition to a through optical transmission line, the optical distributers provided with optical transmission lines provided with the add/drop element for each of the wavelength bands L, H, M are provided for general purpose application. A stock load of each optical distributer is reduced by selecting or combining optical transmission lines applying add/dropping the wavelength band assigned to the connected distribution stations 16-1-16-4.

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