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61. 发明授权

US5872647A Optical transmitting terminal 失效
标题翻译：光发射终端
公开(公告)号：US5872647A
公开(公告)日：1999-02-16
申请号：US760411
申请日：1996-12-04
申请人： Hidenori Taga , Shu Yamamoto , Noboru Edagawa , Shigeyuki Akiba
发明人： Hidenori Taga , Shu Yamamoto , Noboru Edagawa , Shigeyuki Akiba
IPC分类号： G02F1/01 , H04B10/2569 , H04B10/40 , H04B10/50 , H04B10/516 , H04B10/524 , H04B10/556 , H04B10/60 , H04B10/61 , H04B10/04
CPC分类号： H04B10/532
摘要： The object of the present invention is to provide an optical transmitter which enables the reduction of the strong dependency of the transmission characteristic on the high-speed polarization scrambler driving signal phase. The light outputted from a light source is converted to a RZ pulse by an electro-absorption modulator. The RZ pulse is modulated by a data modulator, and the polarization thereof is scrambled in a high-speed electro-optic polarization scrambler and outputted from the output terminal thereof. Since, in the present invention, the light is once changed to a RZ pulse, the strong dependency of the optical signal transmission characteristic on the high-speed polarization scrambler driving signal phase can be reduced. Further, if the phase of the RZ pulse in the NRZ modulation signal is made to synchronize with the rising edge or the falling edge of the NRZ signal, the dependency on the high-speed polarization scrambler driving signal phase can be further reduced.
摘要翻译：本发明的目的是提供一种能够降低传输特性对高速偏振加扰器驱动信号相位的强依赖性的光发射机。从光源输出的光通过电吸收式调制器转换为RZ脉冲。 RZ脉冲由数据调制器调制，其极化在高速电光偏振扰乱器中被加扰并从其输出端输出。由于在本发明中，光一度变为RZ脉冲，所以可以降低光信号传输特性对高速偏振加扰器驱动信号相位的强烈依赖性。此外，如果使NRZ调制信号中的RZ脉冲的相位与NRZ信号的上升沿或下降沿同步，则可以进一步降低对高速偏振加扰器驱动信号相位的依赖性。

62. 发明授权

US5838477A Optical submarine branching device 失效
标题翻译：光学潜艇分支装置
公开(公告)号：US5838477A
公开(公告)日：1998-11-17
申请号：US727678
申请日：1996-10-08
申请人： Shu Yamamoto , Noboru Edagawa , Hidenori Taga , Tetsuyuki Miyakawa
发明人： Shu Yamamoto , Noboru Edagawa , Hidenori Taga , Tetsuyuki Miyakawa
IPC分类号： G02B27/28 , G02B6/12 , G02B6/34 , G02F1/31 , H04B10/03 , H04B10/038 , H04B10/07 , H04B10/27 , H04B10/29 , H04B10/296 , H04J14/00 , H04J14/02 , H04B10/17
CPC分类号： G02B6/2932 , G02B6/12007 , G02B6/29383 , H04J14/0206 , H04J14/0212 , H04J14/0213 , G02B2006/12164
摘要： An optical submarine branching unit employing an optical circuit structure which is small in the number of optical components used, permits reduction of optical insertion loss and is well compatible with the ADD/DROP function suitable for use in wavelength multiplex transmission. An optical fiber pair provided in an optical submarine cable connecting between first and second points is branched toward a third point, an optical circulator capable of reversing the direction of rotation of an optical input/output is provided as optical switching means by which, in the event of a failure in the branch transmission system having the branched optical fiber pair, the optical fiber pair is connected between the first and second points directly without being branched to the third point.
摘要翻译：采用光学组件数量少的光学电路结构的光学海底分支单元允许减少光插入损耗，并且与适用于波长多路复用传输的ADD / DROP功能很好地兼容。设置在连接在第一和第二点之间的光学海底光缆中的光纤对被分配到第三点，能够反转光输入/输出的旋转方向的光循环器被提供作为光开关装置，在具有分支光纤对的分支传输系统中发生故障的事件，光纤对直接连接在第一和第二点之间，而不分支到第三点。

63. 发明授权

US5140452A Long-distance high-speed optical communication scheme 失效
标题翻译：长距离高速光通信方案
公开(公告)号：US5140452A
公开(公告)日：1992-08-18
申请号：US636863
申请日：1991-01-02
申请人： Shu Yamamoto , Hidenori Taga , Noboru Edagawa , Yoshihiro Yoshida , Shiro Ryu , Hiroharu Wakabayashi
发明人： Shu Yamamoto , Hidenori Taga , Noboru Edagawa , Yoshihiro Yoshida , Shiro Ryu , Hiroharu Wakabayashi
IPC分类号： G02B6/00 , G02F2/00 , H04B10/00 , H04B10/2525 , H04B10/508 , H04B10/524 , H04B10/54 , H04B10/588
CPC分类号： H04B10/505
摘要： In a long-distance high-speed optical communication scheme in which multiple optical amplifiers are provided at a large number of stages in optical fibers, an optical signal from a light source which has a desired small line width and oscillates at a single wavelength is modulated at a high speed by an external modulator and then transmitted in the fibers which are dispersion shifted optical fibers, the zero-dispersion wavelength in which is set to be larger than the oscillation wavelength of the light source. Therefore, noises and the modulation instability, which would occur due to the phase fluctuation in the oscillation wavelength of the light source, and the influence of a waveform distortion due to the dispersion in the optical fibers can be avoided to make it possible for the first time in history to transmit the optical signals at the high-speed in the long-distance optical communication system employing the optical amplifiers.
摘要翻译：在光纤中以多个阶段提供多个光放大器的长距离高速光通信方式中，来自具有期望的小线宽并且以单个波长振荡的光源的光信号被调制通过外部调制器以高速度传输，然后在作为色散位移光纤的光纤中传输，其中零色散波长被设置为大于光源的振荡波长。因此，可以避免由于光源的振荡波长的相位波动而产生的噪声和调制不稳定性，以及由于光纤中的色散引起的波形失真的影响，使得第一在使用光放大器的长距离光通信系统中以高速传输光信号的历史时间。

64. 发明授权

US4923291A Optical amplification 失效
标题翻译：光放大
公开(公告)号：US4923291A
公开(公告)日：1990-05-08
申请号：US219600
申请日：1988-07-15
申请人： Noboru Edagawa , Kiyofumi Mochizuki , Yoshinao Iwamoto
发明人： Noboru Edagawa , Kiyofumi Mochizuki , Yoshinao Iwamoto
IPC分类号： G02F1/35 , H01S5/00 , H04B10/11 , H04B10/29
CPC分类号： H04B10/2914
摘要： An optical amplification method or system for an optical communication system which transmits signal light from the transmitting side to the receiving side via an optical transmission medium formed by an optical fiber or space. In accordance with the present invention, the signal light entered a certain state of polarization in at least one part of the transmitting side, the receiving side and the optical transmission medium is separated into two orthogonal polarized waves by a polarizing beam coupler/splitter. The two polarized waves are amplified by optical amplifiers disposed in correspondence to their state of polarization, respectively. The amplified orthogonal polarized waves are combined together by another polarizing beam coupler/splitter.
摘要翻译：一种用于通过由光纤或空间形成的光传输介质将信号光从发送侧传输到接收侧的光通信系统的光放大方法或系统。根据本发明，信号光在发送侧的至少一部分中进入一定的偏振状态，接收侧和光传输介质通过偏振光束耦合器/分离器分离成两个正交的偏振波。两个偏振波被分别对应于它们的偏振状态设置的光学放大器放大。放大的正交极化波由另一个偏振光束耦合器/分离器组合在一起。

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