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21. 发明授权

US5559910A Wavelength division multiplexed optical fiber transmission equiptment 失效
标题翻译：波分复用光纤传输
公开(公告)号：US5559910A
公开(公告)日：1996-09-24
申请号：US452028
申请日：1995-05-26
申请人： Hidenori Taga , Noboru Edagawa , Shu Yamamoto , Noriyuki Takeda , Shigeyuki Akiba
发明人： Hidenori Taga , Noboru Edagawa , Shu Yamamoto , Noriyuki Takeda , Shigeyuki Akiba
IPC分类号： G02F1/35 , H04B10/2507 , H04B10/2525 , H04B10/2563 , G02B6/28
CPC分类号： H04B10/25253 , H04B10/2563
摘要： It is the object of the present invention to optimize the degradation due to the four-wave mixing of wavelength multiplexed signals and the distortion due to the chromatic dispersion, thereby to provide a wavelength division multiplexed optical fiber transmission equipment having good transmission characteristics. A WDM transmitting terminal consists of four transmitters of channels 1 to 4, and a wavelength-division multiplexer. Further, a WDM receiving terminal consists of an equalization optical fiber, a wavelength-division demultiplexer, and four receivers of the channels 1 to 4. The WDM transmitting terminal and the WDM receiving terminal are interconnected by transmission optical fibers and an optical amplifier. The equipment is designed so that the wavelengths .lambda..sub.1, .lambda..sub.2, .lambda..sub.3 and .lambda..sub.4 of the optical signals output from the transmitters all lie on the short-wavelength side with respect to the average zero-dispersion wavelength .lambda..sub.0. This allows the distortion due to the four-wave mixing of a wavelength multiplexed signal to be reduced. The equalization optical fiber has a chromatic dispersion of a sign opposite to the chromatic dispersion of the optical fibers forming a transmitting path, thereby for compensating the chromatic dispersion of the optical signals output from the transmitters.
摘要翻译：本发明的目的是优化由于波分复用信号的四波混频和由于色散导致的失真的劣化，从而提供具有良好传输特性的波分复用光纤传输设备。 WDM发射终端由通道1至4的四个发射器和波分复用器组成。此外，WDM接收终端由均衡光纤，波分多路分解器，以及通道1〜4的4个接收器构成.WDM发送终端和WDM接收终端由发送光纤和光放大器互连。设备的设计使得从发射机输出的光信号的波长λ1，λ2，λ3和λ4相对于平均零色散波长λ0位于短波长侧。这允许由于要减少的波长复用信号的四波混频引起的失真。均衡光纤具有与形成发送路径的光纤的色散相反的符号的色散，从而补偿从发送器输出的光信号的色散。

22. 发明授权

US5430795A Optical transmitter with the signal light of reduced degree of polarization and optical depolarizing circuit 失效
标题翻译：光发射机与信号光的偏振度降低和光学去极化电路
公开(公告)号：US5430795A
公开(公告)日：1995-07-04
申请号：US58108
申请日：1993-05-06
申请人： Hidenori Taga , Noboru Edagawa , Shu Yamamoto , Shigeyuki Akiba , Hiroharu Wakabayashi
发明人： Hidenori Taga , Noboru Edagawa , Shu Yamamoto , Shigeyuki Akiba , Hiroharu Wakabayashi
IPC分类号： H04B10/25 , H04B10/532 , G02B6/00
CPC分类号： H04B10/532 , H04B10/25
摘要： An optical transmitter for providing a signal light with a reduced degree of polarization, the transmitter being used as a transmitting terminal of an optical repeater system that encompasses optical amplifiers at a signal light transmitter, the optical transmitter includes an optical source for transmitting a signal light source; and a degree of polarization reducing circuit including a polarizing beam splitter splitting the signal light source from the optical source means into a first polarized component and a second polarized component that are orthogonal to each other; a first optical path transmitting the first polarized component input from the polarizing beam splitter while maintaining the polarization plane of the first polarized component; a second optical path, which is spatially separate from the first optical path, transmitting the second polarized component input from the polarizing beam splitter while maintaining the polarization plane of the second polarized component; and a polarizing beam mixer mixing the first polarized component and the second polarized component that were transmitted over the first optical path and the second optical path, respectively; the length A1 of the first optical path and the length A2 of the second optical path satisfying the equation.vertline.A2.times.n2-A1.times.n1.vertline..gtoreq.0.22.div..DELTA.v.times.Cwhere n1 is the refractive index of the first optical path, n2 is the refractive index of the second optical path, .DELTA.v is the line width of the signal light source, and C is light velocity.
摘要翻译：一种用于提供具有降低的偏振度的信号光的光发射机，所述发射机被用作在信号光发射机处包含光放大器的光中继器系统的发射终端，所述光发射机包括用于发射信号光的光源资源; 以及偏振光降低电路，其包括将信号光源从光源装置分离为彼此正交的第一偏振分量和第二偏振分量的偏振分束分离器; 第一光路，其在保持所述第一偏振分量的偏振面的同时，从所述偏振分束器输入的所述第一偏振分量; 与第一光路在空间上分离的第二光路，在保持第二偏振分量的偏振面的同时透射从偏振分束器输入的第二偏振分量; 以及分别混合在第一光路和第二光路上透射的第一偏振分量和第二偏振分量的偏振光束混合器; 第一光路的长度A1和第二光路的长度A2满足方程式| A2xn2-A1xn1 |> = 0.22 DIVIDED DELTA vxC其中n1是第一光路的折射率，n2是折射率第二光路，DELTA v是信号光源的线宽，C是光速。

23. 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。

24. 发明授权

US5937126A Optically amplifying/repeating transmission system and optical amplifier 失效
标题翻译：光放大/重复传输系统和光放大器
公开(公告)号：US5937126A
公开(公告)日：1999-08-10
申请号：US987812
申请日：1997-12-10
申请人： Shu Yamamoto , Noboru Edagawa , Hidenori Taga , Shigeyuki Akiba
发明人： Shu Yamamoto , Noboru Edagawa , Hidenori Taga , Shigeyuki Akiba
IPC分类号： H04B3/36 , H04B10/25 , H04B10/2543 , H04B10/29 , H04B10/291 , H04B10/293 , H04B10/564 , H04B10/572 , G02B6/02
CPC分类号： H04B10/2912 , H04B10/291
摘要： An optical transmission system for optical transmission with the capacity of 100 Gb/S over a distance of 9,000 km or more includes an light sending station for outputting an optical signal in the band of 1.55 .mu.m, and an light receiving station connected to the light sending station by an optical fiber transmission line. The optical fiber transmission line includes a plurality of transmission optical fibers connected by optically amplifying repeaters. Each transmission optical fiber is a single-mode optical fiber having an effective cross-sectional area of 80 .mu.m.sup.2 or more. Each optically amplifying repeater includes an erbium-doped optical fiber for pumping in 0.98 .mu.m, WDM coupler for demultiplexing and multiplexing 1.55 .mu.m and 0.98 .mu.m wavelengths, optical isolator and gain equalizing filter, which are connected in series, so as to locate output light from an pumping laser for oscillation in 0.98 .mu.m onto the erbium-doped optical fiber through the WDM coupler.
摘要翻译：在距离为9000km以上的100Gb / S的光传输用光传输系统中，包括用于输出1.55μm的频带的光信号的光发送站和与该光连接的光接收站发送站由光纤传输线。光纤传输线包括通过光学放大转发器连接的多个传输光纤。每个传输光纤是有效横截面积为80μm或更大的单模光纤。每个光放大中继器包括掺铒光纤，用于泵浦0.98μm的WDM耦合器，用于多路复用和复用1.55μm和0.98μm波长，光隔离器和增益均衡滤波器，它们串联连接，以便定位将来自泵浦激光器的光输出通过WDM耦合器在0.98μm振荡到掺铒光纤上。

25. 发明授权

US5710660A Gain-controllable optical amplifier and optical gain-control method 失效
标题翻译：增益可控光放大器和光增益控制方法
公开(公告)号：US5710660A
公开(公告)日：1998-01-20
申请号：US606653
申请日：1996-02-26
申请人： Shu Yamamoto , Hidenori Taga , Noboru Edagawa , Shigeyuki Akiba , Kuniaki Motoshima , Katsumi Takano , Tadayoshi Kitayama
发明人： Shu Yamamoto , Hidenori Taga , Noboru Edagawa , Shigeyuki Akiba , Kuniaki Motoshima , Katsumi Takano , Tadayoshi Kitayama
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/13 , H01S3/131 , H01S3/00 , C02B6/00
CPC分类号： H04B10/2931 , H01S3/06758 , H01S3/1301
摘要： This invention provides an optical amplifier which has low noise characteristics for a wide range of input signal electric power. The optical amplifier has a plurality of cascaded optical amplifying units, a signal level detector, and a pump-source controller. The pump-source controller changes controlling objects from a pump-source corresponding to a first one of the optical amplifying units to a pump-source corresponding to a second one of the optical amplifying units according to a detection level of the signal level detector from a low level to a high level. When the detection level is outside of a control object range, the optical amplifier controls an output from the pump-source to stabilize. When the detection level is within the control object range, the optical amplifier controls an output from a pump-source of each of optical amplifying units according to the detection level.
摘要翻译：本发明提供一种对于宽范围的输入信号电力具有低噪声特性的光放大器。光放大器具有多个级联的光放大单元，信号电平检测器和泵源控制器。泵源控制器根据来自信号电平检测器的检测电平，将对应于第一光放大单元的泵浦源的控制对象改变为对应于第二光放大单元的泵浦源低水平到高水平。当检测电平超出控制对象范围时，光放大器控制泵源的输出稳定。当检测水平处于控制对象范围内时，光放大器根据检测水平控制每个光放大单元的泵浦源的输出。

26. 发明授权

US5471333A Optical communication system 失效
标题翻译：光通信系统
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。

27. 发明授权

US5401957A Optical waveform shaping device for peforming waveform equalization and timing synchronization 失效
标题翻译：用于波形均衡和定时同步的波形整形装置
公开(公告)号：US5401957A
公开(公告)日：1995-03-28
申请号：US215887
申请日：1994-03-21
申请人： Masatoshi Suzuki , Noboru Edagawa , Hideaki Tanaka , Shu Yamamoto , Yuichi Matsushima
发明人： Masatoshi Suzuki , Noboru Edagawa , Hideaki Tanaka , Shu Yamamoto , Yuichi Matsushima
IPC分类号： H01S5/06 , G02B6/12 , G02F1/015 , H04B10/07 , H04B10/2507 , H01J5/16
CPC分类号： H04B10/299
摘要： To perform waveform shaping, retiming and amplification of the transmitted pulse signal of a binary PCM fiber optic communication employing an optical pulse signal which has a pulse duty factor within 1 with respect to a time slot, an optical waveform shaping device is proposed in which the optical pulse signal is branched by an optical branch circuit into two optical signals. The one transmitted optical signal passes through a photodetector, a band-pass filter for extracting the fundamental frequency component of the signal, an amplifier and a delay circuit, so that the signal is converted to a sinusoidal voltage synchronized with the optical pulse signal. The other optical signal passes through a semiconductor electrical absorption type optical modulator which is driven by the sinusoidal voltage and a DC voltage, so that the width of a gate waveform is changed by controlling the amplitude of the sinusoidal voltage and the DC voltage.
摘要翻译：为了对采用相对于时隙的脉冲占空比为1的脉冲信号的二进制PCM光纤通信的发送脉冲信号进行波形整形，重新定时和放大，提出了一种光波形整形装置，其中光脉冲信号由光分支电路分支成两个光信号。一个发送的光信号通过光电检测器，用于提取信号的基频分量的带通滤波器，放大器和延迟电路，使得信号被转换成与光脉冲信号同步的正弦电压。另一个光信号通过由正弦电压和直流电压驱动的半导体吸电型光调制器，从而通过控制正弦电压和直流电压的幅度来改变门波形的宽度。

28. 发明授权

US06532091B1 Optical digital regenerator 失效
标题翻译：光学数字再生器
公开(公告)号：US06532091B1
公开(公告)日：2003-03-11
申请号：US09246256
申请日：1999-02-08
申请人： Tetsuya Miyazaki , Tomohiro Otani , Masatoshi Suzuki , Noboru Edagawa , Shu Yamamoto
发明人： Tetsuya Miyazaki , Tomohiro Otani , Masatoshi Suzuki , Noboru Edagawa , Shu Yamamoto
IPC分类号： H04B1002
CPC分类号： H04B10/299
摘要： An optical digital regenerator for digitally regenerating an input signal in an intact optical state. A first operating unit has a first probe light generator for generating a first probe light and a first optical operator for converting a waveform of the first probe light output from a first probe light generator according to an optical intensity waveform of the input signal light. A clock extractor extracts a clock component of the input signal light from a photocurrent generated by the first optical operator. A second optical operating unit has a second probe light generator for generating a second probe light pulsed in accordance with the clock output from the clock extractor and a second optical operator for sampling the second probe pulse light output from the second probe light generator.
摘要翻译：一种用于以完整光学状态数字再生输入信号的光学数字再生器。第一操作单元具有用于产生第一探测光的第一探测光发生器和用于根据输入信号光的光强度波形转换从第一探测光发生器输出的第一探测光的波形的第一光学操作器。时钟提取器从由第一光学运算器产生的光电流提取输入信号光的时钟分量。第二光学操作单元具有第二探测光发生器，用于产生根据来自时钟提取器的时钟输出脉冲的第二探测光，以及第二光学操作器，用于对从第二探测光发生器输出的第二探测脉冲光进行采样。

29. 发明授权

US5959764A Wavelength converter, optically operational device and optical pulse phase detecting circuit 失效
标题翻译：波长转换器，光学运算器件和光脉冲相位检测电路
公开(公告)号：US5959764A
公开(公告)日：1999-09-28
申请号：US923349
申请日：1997-09-04
申请人： Noboru Edagawa , Masatoshi Suzuki , Shu Yamamoto
发明人： Noboru Edagawa , Masatoshi Suzuki , Shu Yamamoto
IPC分类号： G02F2/02 , G02F1/015 , G02F2/00 , G02F3/00 , H04B10/2507 , H04B10/29 , H04B10/516 , H04B10/54 , H04B10/572 , H04B10/58 , H04B10/61 , H04J14/08 , G02F1/39
CPC分类号： G02F2/004 , G02F2001/0157 , H01S5/509 , H04J14/08
摘要： A waveform converter includes a transmission-type InGaAsP electroabsorption optical modulator 10 using the Franz-Keldysh effect. Continuous light (probe light) 12 as a target of wavelength conversion is fed to an end surface 10a of the optical modulator 10 while a constant voltage of 3 V is applied to the optical modulator 10. An optical circulator 14 is supplied with original signal light (signal light to be waveform-converted) 16 through its terminal A, and delivers it from the terminal B thereof to another end surface 10b of the optical modulator 10. The optical modulator 10 gives a loss to the probe light 12 according to the intensity of the original signal light 16 and makes the waveform of the probe light 12 to be substantially the same as the original signal light. The probe light waveform-converted by the optical modulator 10 and output from the end surface 10b is fed to a terminal B of an optical circulator 14 as a waveform-converted light 18 and output from its terminal C.
摘要翻译：波形转换器包括使用Franz-Keldysh效应的透射型InGaAsP电吸收光调制器10。将作为波长转换的目标的连续光（探测光）12馈送到光调制器10的端面10a，同时将3V的恒定电压施加到光调制器10。光环行器14被提供有原始信号光（要被波形转换的信号光）16，并将其从端子B传送到光调制器10的另一端面10b。光调制器10根据强度给探测光12带来损耗的原始信号光16，使探测光12的波形基本上与原始信号光相同。由光调制器10波形转换并从端面10b输出的探测光被作为波形转换光18馈送到光环行器14的端子B，并从其端子C输出。

30. 发明授权

US06459518B1 Optical transmitting apparatus 失效
标题翻译：光发射装置
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。

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