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1. 发明专利

JPH06132944A NON-HIT SWITCHING METHOD FOR TRANSMISSION LINE 失效
公开(公告)号：JPH06132944A
公开(公告)日：1994-05-13
申请号：JP28334092
申请日：1992-10-22
申请人： FUJITSU LTD
发明人： SAKAI TOSHIYUKI , TAKAHASHI MASAAKI , YAMAGATA YASUTAKA , SUZUKI AYA
IPC分类号： H04L1/22 , H04J3/00
摘要： PURPOSE:To provide a non-hit switching method for transmission lines which can switch the data with no hit and regardless of the distance between two duplex transmission lines of a new synchronization network SDH digital multi plex transmission system. CONSTITUTION:An identification signal inserting part 11 is provided in the transmitter part, and the receiver side is constituted of a 0-system receiver part 20, a 1-system receiver part 30, 0-system frame aligner 40, a 1-system aligner 50, an identification signal separating part 60, a read control part 70, and a selection part 80. The identification signal sent to an optional byte of a POH signal of an STM frame format from the part 11 is separated and read by the part 60 which inputs the 0-system and 1-system data. When a frame difference is detected, the read frame of the timing going back by the frame difference is sent to both aligners 40 and 50 from the part 70. Then the part 80 is switched after the frame synchronization of the read data is secured.

2. 发明专利

JPH0618382B2 失效
公开(公告)号：JPH0618382B2
公开(公告)日：1994-03-09
申请号：JP25593985
申请日：1985-11-15
申请人： FUJITSU LTD
发明人： FUJIWARA HARUO , TAKAHASHI MASAAKI , KOIKE KYOYUKI , MYAZAKI TAKASHI
IPC分类号： H04L27/22 , H04L25/02

3. 发明专利

JPH05191380A WAVELENGTH MULTIPLEX TRANSMISSION SYSTEM 失效
公开(公告)号：JPH05191380A
公开(公告)日：1993-07-30
申请号：JP2315492
申请日：1992-01-13
申请人： FUJITSU LTD
发明人： TAKAHASHI MASAAKI
IPC分类号： H04J14/00 , H04J14/02
摘要： PURPOSE:To constitute the system so that light receiving power of each wave length subjected to wavelength multiplexing in a receiving side can be contained within an allowable range, with regard to the wavelength multiplex transmission system for transmitting a signal of at least two wavelengths or more by wavelength multiplexing to an optical repeating transmission line (optical amplifying transmission line) in which an optical direct amplifier is used for a repeater. CONSTITUTION:In the wavelength multiplex transmission system for transmitting a signal of at least two wavelengths or more by wavelength multiplexing to an optical repeating transmission line in which an optical direct amplifier is used for a repeater 60, optical transmitting wavelength is controlled by a transmitting station 50 side so that optical receiving power of each wavelength by a receiving station 70 is contained within a prescribed power range.

4. 发明专利

JPH0519311A OPTICAL AMPLIFICATION SYSTEM 失效
公开(公告)号：JPH0519311A
公开(公告)日：1993-01-29
申请号：JP17503491
申请日：1991-07-16
申请人： FUJITSU LTD
发明人： TAKAHASHI MASAAKI
IPC分类号： G02B6/00 , G02F1/35 , H01S3/06 , H01S3/07 , H01S3/131
摘要： PURPOSE:To provide an optical amplifier which causes no output saturation as to the optical direct amplification system which amplifies a light signal in a light state by multiplexing the light signal from an optical path and pumping light from a pumping light source and inputting them to an optical fiber doped with erbium as a rare earth element to excite induced emission. CONSTITUTION:The optical amplification system which multiplexes and inputs the light signal from the optical path L and the pumping light from the pumping light source 41 to the erbium-doped optical fiber 3 and amplifies the light signal is provided with an optical attenuating means 1 which attenuates the light signal from the optical path L previously and then outputs it to the erbium- doped optical fiber 3 and a detecting means 21 which detects the power of the light signal inputted to the erbium-doped optical fiber 3 and the attenuation quantity of the optical attenuating means 1 is set to a level where the light output is not saturated after the optical amplification according to the power detected by the detecting means 21.

5. 发明专利

JPH0454326B2 失效
公开(公告)号：JPH0454326B2
公开(公告)日：1992-08-31
申请号：JP2282587
申请日：1987-02-03
申请人： FUJITSU LTD
发明人： SAITO KOICHI , TAKAHASHI MASAAKI , INOE YOSHUKI , MORIMOTO YOJI
IPC分类号： G01R31/327 , G01R31/333 , H01H11/00

6. 发明专利

JPH04127625A OPTICAL REPEATER 失效
公开(公告)号：JPH04127625A
公开(公告)日：1992-04-28
申请号：JP24848290
申请日：1990-09-18
申请人： FUJITSU LTD
发明人： TAKAHASHI MASAAKI , MAKI TAKANORI
IPC分类号： H04B10/035 , H04B10/077 , H04B10/079 , H04B10/29 , H04B10/293 , H04B10/297 , H04B17/40
摘要： PURPOSE:To implement an optical loopback without being synthesized with an optical signal from an opposed line side by connecting an optical changeover switch at a terminal station side to a line as usual and switching the optical changeover switch of the opposed line side from the usual line to the loopback so as to form a loopback path. CONSTITUTION:When a loopback instruction is sent from a terminal station via incoming line L1, the instruction passes through an optical changeover switch 1 connecting normally to the line and a signal from an optical amplifier 2 is decoded by a control circuit 7 to detect the loopback instruction from the terminal station. That is, the control circuit 7 leaves the connection of the optical changeover switch 1 as it is and changes over the optical changeover switch 4 of the opposed line side to the position of the loopback to form the loopback path. Thus, the synthesis of the loopback optical signal and the optical signal in the opposed line side in the optical repeater making loopback is avoided.

7. 发明专利

JPH0376322A FEEDER SWITCHING CIRCUIT 失效
公开(公告)号：JPH0376322A
公开(公告)日：1991-04-02
申请号：JP21174689
申请日：1989-08-17
申请人： FUJITSU LTD
发明人： INOUE YOSHIYUKI , TAKAHASHI MASAAKI
IPC分类号： H04B3/44
摘要： PURPOSE:To repair a faulty part safely by inserting a 2nd relay coil between a relay contact and 1st and 2nd cables and connecting the contact in parallel with a 1st relay contact. CONSTITUTION:When a fault takes place in a submarine cable 11 at an end station A, the direction of the current is inverted by the operation of a switch 25 to energize a relay coil RL 1, whose contact rl1 is closed. As a result, a current flows a path of undersea earth G contact rl1 coil RL2 cable 12 terminal station B power supply 22 to energize a relay coil RL 2, whose contact rl2 is closed. Thus, the cables 12, 13 are energized to attain the communication between terminal stations C and B and the faulty cable 11 is repaired during that time. Similarly, even anywhere of cables is faulty, the faulty location is repaired safely while keeping the operation between cables without any fault.

8. 发明专利

JPH0315830A OPTICAL SWITCH 失效
公开(公告)号：JPH0315830A
公开(公告)日：1991-01-24
申请号：JP15119789
申请日：1989-06-14
申请人： FUJITSU LTD
发明人： TAKAHASHI MASAAKI , SAKAI TOSHIYUKI
IPC分类号： G02F1/31 , G02F2/02
摘要： PURPOSE:To obtain the optical switch which selects a path, etc., with a wavelength by providing the semiconductor laser diodes which oscillates with the wavelength lambda1 or lambda2 and lambda1 or lambda2 and oscillating a wave with the lambda1 or lambda2 according to the wavelength of input light. CONSTITUTION:The optical switch consists of a wavelength converting means 10, a wavelength distributing means 20 and a wavelength detecting means 30. The wavelength converting means 10 is equipped with the semiconductor laser diode 11 which oscillates with the wavelength lambda1 or lambda2 and an external resonator 12 which is variable in resonator length, and the wavelength distributing means 20 is equipped with a waveguide 21, a semiconductor laser diode 22 which oscillates with the wavelength lambda1 and a semiconductor laser diode 23 which oscillates with the wavelength lambda2, and the wavelength detecting means 30 is equipped with photodetectors 31 and 32 which photodetect the output light of the wavelength distributing means 20. Consequently, the wavelength conversion of the incident laser light, the transmission destination switching of the incident laser light based upon the wavelengths, etc., become possible.

9. 发明专利

JPH02285732A OPTICAL SUBMARINE REPEATER 失效
公开(公告)号：JPH02285732A
公开(公告)日：1990-11-26
申请号：JP10835389
申请日：1989-04-26
申请人： FUJITSU LTD
发明人： TAKAHASHI MASAAKI
IPC分类号： H04B17/40 , H04B3/44
摘要： PURPOSE:To facilitate the detection of a reflected wave from a true faulty point by giving a capacitance between an internal circuit of a repeater and an enclosure and making the circuit impedance Z viewing from an optical submarine cable side equal to the characteristic impedance Z0 of the feeding system line of the cable. CONSTITUTION:The enclosure 1 is connected to ground, a high voltage is applied to the feeding line of a cable 3 to produce a high level difference between an internal unit 2 and the enclosure 1. An equivalent capacitance C is formed between the internal unit 2 and the enclosure 1 is formed via an insulator 4 such as a polyethylene and an LC filter is formed with two inductors L. In the case of viewing the repeater from the cable 3, the circuit impedance Z is Z=(2L/C) . When the capacitance C is regulated to obtain the relation of the characteristic impedance Z0 = Z, then the impedance is matched and the reflection caused when the fault retrieval pulse of the repeater is inputted is suppressed considerably and the detection of the reflected wave from the true faulty point is facilitated and the fault point location is facilitated.

10. 发明专利

JPH0218610B2 失效
公开(公告)号：JPH0218610B2
公开(公告)日：1990-04-26
申请号：JP21115981
申请日：1981-12-28
申请人： FUJITSU LTD
发明人： IGUCHI KAZUO , HANANO NAOMASA , FUKUGAHARA TSUTOMU , TAKAHASHI MASAAKI
IPC分类号： H03G3/30

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