公开(公告)号：US06744990B1

公开(公告)日：2004-06-01

申请号：US09434679

申请日：1999-11-05

申请人： Masatoshi Suzuki ,  Noriyuki Takeda ,  Noboru Edagawa ,  Hideaki Tanaka ,  Shinichi Nakagawa ,  Hidenori Taga ,  Koji Goto

发明人： Masatoshi Suzuki ,  Noriyuki Takeda ,  Noboru Edagawa ,  Hideaki Tanaka ,  Shinichi Nakagawa ,  Hidenori Taga ,  Koji Goto

IPC分类号： H04B1012

CPC分类号： H04B10/2935 ,  H04B10/25253 ,  H04J14/0221

摘要： An object of the present invention is to realize almost the same transmission characteristic in all wavelengths at a transmission rate of 10 Gb/s or more. An optical transmitter 10 outputs WDM signal light multiplexed with signal light of a plurality of wavelengths toward an optical transmission line 12. The optical transmission line 12 comprises an optical transmission fiber 14, an optical repeating amplifier 16 and a dispersion compensating fiber 18. The gain characteristic of the optical repeating amplifier 16 is set so that the gain becomes the maximum at the effective zero dispersion wavelength of the optical transmission line 12 and that lowers inversely proportional to the distance from the effective zero dispersion wavelength. The whole optical transmission line 12 is set so that the peak power deviation between the effective zero dispersion wavelength &lgr;0 and the wavelength &lgr;1 or &lgr;n on both end becomes approximately 4 dB.

摘要翻译： 本发明的目的是以10Gb / s以上的传输速率实现所有波长的几乎相同的传输特性。 光发送器10将与多个波长的信号光复用的WDM信号光输出到光传输线12.光传输线12包括光传输光纤14，光中继放大器16和色散补偿光纤18.增益 光学重复放大器16的特性被设置为使得增益在光传输线路12的有效零色散波长处变为最大值，并且降低与距有效零色散波长的距离成反比。 整个光传输线路12被设置为使得有效零色散波长λ0和两端的波长λ1或兰博丹之间的峰值功率偏差变为大约4dB。

公开(公告)号：US06445478B1

公开(公告)日：2002-09-03

申请号：US09764271

申请日：2001-01-19

申请人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

发明人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

IPC分类号： H04B1004

摘要： Detection of an optical pulse position uses an optical pulse string with a determined repetitive ratio and an electric clock signal with a same frequency as the repetitive ratio of the optical pulse string. A phase of the electric clock signal oscillator is shifted and supplied to an optical modulator. The optical modulator modulates the optical pulse string based on the electric clock signal and outputs a modulated optical signal. A photo detector converts the modulated optical signal output from the optical modulator to an electric signal. The phase shift amount of the electric clock signal is controlled to maximize an output from the photo detector. Additionally, a dither signal may be used in the control of the phase shift, more than the optical modulator may be employed, and/or more than color light source may be employed. The use of at least one of feed forward and feedback control provided by maximizing an output of the photo detector allows an optical pulse having a short width to be realized.

公开(公告)号：US06236488B1

公开(公告)日：2001-05-22

申请号：US09052072

申请日：1998-03-31

申请人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

发明人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

IPC分类号： H04B1004

CPC分类号： G02F1/0327 ,  G01J11/00 ,  G02F2203/26 ,  H04J14/08

摘要： Detection of an optical pulse position uses an optical pulse string with a determined repetitive ratio and an electric clock signal with a same frequency as the repetitive ratio of the optical pulse string. A phase of the electric clock signal oscillator is shifted and supplied to an optical modulator. The optical modulator modulates the optical pulse string based on the electric clock signal and outputs a modulated optical signal. A photo detector converts the modulated optical signal output from the optical modulator to an electric signal. The phase shift amount of the electric clock signal is controlled to maximize an output from the photo detector. Additionally, a dither signal may be used in the control of the phase shift, more than the optical modulator may be employed, and/or more than color light source may be employed. The use of at least one of feed forward and feedback control provided by maximizing an output of the photo detector allows an optical pulse having a short width to be realized.

摘要翻译： 光脉冲位置的检测使用具有确定的重复比率的光脉冲串和具有与光脉冲串的重复比相同频率的电时钟信号。 电时钟信号振荡器的相位移位并提供给光调制器。 光调制器基于电时钟信号调制光脉冲串，并输出调制光信号。 光检测器将从光调制器输出的调制光信号转换为电信号。 控制电时钟信号的相移量使光检测器的输出最大化。 另外，抖动信号可以用于相移的控制，可以采用多于光调制器，和/或多于彩色光源。 使用通过使光检测器的输出最大化而提供的前馈和反馈控制中的至少一个允许实现具有短宽度的光脉冲。

公开(公告)号：US5471333A

公开(公告)日：1995-11-28

申请号：US125428

申请日：1993-09-22

申请人： Hidenori Taga ,  Masatoshi Suzuki ,  Noboru Edagawa ,  Shu Yamamoto ,  Hiroharu Wakabayashi

发明人： Hidenori Taga ,  Masatoshi Suzuki ,  Noboru Edagawa ,  Shu Yamamoto ,  Hiroharu Wakabayashi

IPC分类号： G02F1/35 ,  H04B10/2507 ,  H04B10/2525 ,  H04B10/299 ,  H04B10/508 ,  H04B10/524 ,  H04B10/58 ,  H04B10/00 ,  H04B10/12

CPC分类号： H04B10/25077

摘要： An optical transmission system is disclosed, in which the transmission of the optical soliton pulses is controlled by controlling the wavelength dispersion of the optical fiber transmission line for each long section including a plurality of optical amplifier repeaters. In this case,the first sections having an average value of the wavelength dispersion larger than the dispersion value meeting with the soliton condition and the second sections having an average value of the wavelength dispersion smaller than the dispersion value meeting with the soliton condition are alternatively allocated in the optical fiber transmission line, so that the average value of the wavelength dispersion of the entire length of the optical fiber transmission line assumes a positive value.

摘要翻译： 公开了一种光传输系统，其中通过控制包括多个光放大器中继器的每个长部分的光纤传输线的波长色散来控制光孤子脉冲的传输。 在这种情况下，交替地分配具有大于满足孤子条件的色散值的波长色散的平均值的第一部分和具有小于满足孤立条件的色散值的波长色散的平均值的第二部分 在光纤传输线中，使得光纤传输线的整个长度的波长色散的平均值为正值。

公开(公告)号：US5162936A

公开(公告)日：1992-11-10

申请号：US655530

申请日：1991-02-14

申请人： Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Hiroharu Wakabayashi

发明人： Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Hiroharu Wakabayashi

IPC分类号： H01S3/067 ,  H01S3/131 ,  H04B10/07 ,  H04B10/077 ,  H04B10/29 ,  H04B10/54 ,  H04B10/564

CPC分类号： H04B10/2931 ,  H04B10/0777 ,  H04B10/2912 ,  H04B10/2918 ,  H01S3/06754 ,  H01S3/10015 ,  H01S3/1301 ,  H04B2210/074

摘要： Apparatus for monitoring a plurality of optical repeaters of an optical communication system in which each said repeater directly amplifies an optical signal transmitted in an optical fiber and passing through the respective optical repeater, including an optical division circuit for dividing an outgoing main line signal and a monitoring signal, a format conversion circuit by which monitoring information is converted into binary information, a previous modulation circuit by which a monitoring signal is modulated with a sine wave, a comparison circuit which compares the monitoring signal with a reference voltage, a voltage controlled amplifier which amplifies the modulated monitoring signal, an automatic gain control circuit which regulates the output from the outgoing optical repeater, and an outgoing optical repeater which includes a stimulating light source, a wave synthesizer and a doped optical fiber.

摘要翻译： 一种用于监视光通信系统的多个光中继器的设备，其中每个所述中继器直接放大在光纤中传输的光信号并通过相应的光中继器，包括用于划分输出主线信号的光分路电路和 监视信号，将监视信息转换为二进制信息的格式转换电路，用正弦波调制监视信号的先前调制电路，将监视信号与参考电压进行比较的比较电路，压控放大器 其放大调制监视信号，调节输出光中继器的输出的自动增益控制电路和包括刺激光源，波合成器和掺杂光纤的输出光中继器。

公开(公告)号：US06504638B1

公开(公告)日：2003-01-07

申请号：US09206512

申请日：1998-12-07

申请人： Keiji Tanaka ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto

发明人： Keiji Tanaka ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto

IPC分类号： H04B1016

CPC分类号： H04B10/294 ,  H04J14/0221

摘要： To increase the number of multiplexed wavelengths and to improve transmission characteristics in a wavelength-division-multiplexed transmission, a bandwidth compressor for bandwidth-compressing the wavelength-division-multiplexed signal light is disposed at a front part of respective optical amplifiers and a bandwidth expander for bandwidth-expanding the wavelength-division-multiplexed signal light output from said optical amplifiers is disposed at a rear part of said optical amplifiers.

摘要翻译： 为了增加复用波长的数量并改善波分复用传输中的传输特性，用于带宽压缩波分复用信号光的带宽压缩器被布置在各个光放大器的前部，带宽扩展器 为了带宽扩展，从所述光放大器输出的波分复用信号光布置在所述光放大器的后部。

公开(公告)号：US06459518B1

公开(公告)日：2002-10-01

申请号：US09329867

申请日：1999-06-11

申请人： Masatoshi Suzuki ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto

发明人： Masatoshi Suzuki ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto

IPC分类号： H04B1000

CPC分类号： H04B10/532

摘要： A laser diode continuously laser-oscillates and its output light is applied to an optical modulator. A pulse driver drives the optical modulator according to a data to be transmitted. A phase modulator is driven by a phase modulator driver and phase-modulates the output from the optical modulator. The polarization direction of the incident light of the phase modulator is set so that the modulation efficiency of the phase modulator becomes the maximum. The output light of the phase modulator inputs a birefringent medium and applies to an optical transmission line after transmitting the birefringent medium. The principal axis of the birefringent medium is disposed so as to be at an angle of 45° to the polarization direction of the output light from the phase modulator.

摘要翻译： 激光二极管连续激光振荡，其输出光被施加到光学调制器。 脉冲驱动器根据要发送的数据驱动光调制器。 相位调制器由相位调制器驱动器驱动并对来自光调制器的输出进行相位调制。 相位调制器的入射光的偏振方向被设定为使得相位调制器的调制效率达到最大。 相位调制器的输出光输入双折射介质，并在透射双折射介质之后施加到光传输线。 双折射介质的主轴被布置成与来自相位调制器的输出光的偏振方向成45°的角度。

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。

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。

公开(公告)号：US5920413A

公开(公告)日：1999-07-06

申请号：US833097

申请日：1997-04-04

申请人： Takayuki Miyakawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Takayuki Miyakawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： G02B27/28 ,  G02B6/293 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04J14/0201 ,  H04J14/0206

摘要： An optical add/drop multiplexing scheme capable of reducing the degradation of the transmission characteristic due to the beat noises caused by the interference of the fiber grating leakage components. An optical add/drop multiplexing device is formed by a high speed polarization scrambler for entering signal lights with a data modulation at a high speed bit rate applied thereto, and scrambling polarization states of entered signal lights at high speed, and an optical add/drop element for receiving the signal lights with the polarization states scrambled by the high speed polarization scrambler, and carrying out an add/drop multiplexing operation for signal lights in a specific wavelength among received signal lights. The high speed polarization scrambler scrambles the polarization states of the entered signal lights so as to lower a probability for having worst polarization states of signal lights and interference lights, by scrambling the polarization states of the entered signal lights into every possible polarization states at nearly equal probabilities.

摘要翻译： 一种能够降低由于光纤光栅泄漏部件的干扰引起的节拍噪声导致的传输特性劣化的光分插复用方案。 通过高速偏振加扰器形成光分插多路复用装置，用于以高速比特率对数据调制进入信号光，并以高速加扰输入的信号光的偏振状态，以及光分插 用于接收具有由高速偏振加扰器加扰的偏振状态的信号光的元件，并对接收到的信号光中的特定波长的信号光进行分插复用操作。 高速极化扰频器对输入的信号光的极化状态加扰，从而通过将输入的信号光的偏振状态加扰到几乎相等的每个可能的极化状态，降低具有信号光和干涉光的最差极化状态的概率 概率