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31. 发明专利

JPS647727A LIGHT TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPS647727A
公开(公告)日：1989-01-11
申请号：JP16117987
申请日：1987-06-30
申请人： NEC CORP
发明人： TAJIMA KAZUTO
IPC分类号： H04B10/572 , H04B10/2507 , H04B10/293 , H04B10/548 , H04B10/564 , H04B10/588
摘要： PURPOSE:To obtain a large light output and to attain an ultra-long distance large capacity wavelength multiplexing PSK optical fiber communication system by controlling constantly the intensity of a phase or frequency modulated light. CONSTITUTION:To transmitters T1-T10, separate signals S1-S10 are inputted, and the output light is multiplexed in the same propagation direction with a multiplexing device 4. For example, in the transmitter T1, a semiconductor laser 12 is continuously oscillated, the output is given through a light phase modulator 13 to a laser diode saturable light amplifier 14 and the output intensity is constantly corrected. A signal light shaped to a constant intensity regardless of a phase modulation with the amplifier 14 is multiplexed with other channel by the multiplexing device 4 and made incident on an optical fiber 5.

32. 发明专利

JPS645127A OPTICAL TRANSMITTER 失效
公开(公告)号：JPS645127A
公开(公告)日：1989-01-10
申请号：JP15967487
申请日：1987-06-29
申请人： NEC CORP
发明人： TAJIMA KAZUTO
IPC分类号： G02F2/00 , G02F1/01 , G02F1/35 , H04B10/2557 , H04B10/293 , H04B10/524 , H04B10/556 , H04B10/564 , H04B10/572 , H04B10/588
摘要： PURPOSE:To attain high performance of wavelength multiplex coherent optical fiber communication by using a light intensity limiter so as to eliminate the intensity fluctuation of the light subject to phase or frequency modulation so as to prevent the production of phase crosstalk. CONSTITUTION:A light intensity limiter 14 consists of a light intensity modulator 141 controlling the light intensity and a part controlling the modulator 141. Since high speed is required for the light intensity modulator 141, a travelling waveform using a lithium iobate the same as an optical phase modulator 13 is used, but since the intensity modulation is applied, the system controlling the coupling coefficient of two adjacent waveguide paths on the lithium iobate is adopted. Then the light subject to intensity modulation by the optical phase modulator 13 is corrected to have a constant intensity by a light intensity limiter 14. Thus, the phase crosstalk in the wavelength multiplex coherent optical fiber communication is remarkably relaxed and multi-channel and long range optical fiber communication are attained.

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