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1. 发明授权

US4965858A Polarization diversity optical receiver for coherent optical communication 失效
标题翻译：用于相干光通信的极化分集光接收机
公开(公告)号：US4965858A
公开(公告)日：1990-10-23
申请号：US310628
申请日：1989-02-14
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda , Hideo Kuwahara , Hiroshi Onaka , Hideyuki Miyata
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda , Hideo Kuwahara , Hiroshi Onaka , Hideyuki Miyata
IPC分类号： G02F2/00 , H04B10/25 , H04B10/516 , H04B10/564 , H04B10/61
CPC分类号： H04B10/61 , H04B10/614 , H04B10/64
摘要： A polarized wave diversity optical receiver for coherent optical communication including: an optical local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing signal light and the local oscillating light to obtain two polarized components; a detecting circuit (9) for detecting the polarized component to output intermediate frequency signals (e.sub.S and e.sub.P); and a frequency control circuit (11) for controlling, in accordance with the intermediate frequency signals (e.sub.S and e.sub.P), the oscillating frequency of the optical local oscillating circuit (7). To ensure that the intermediate frequency does not disappear, the frequency control circuit (11) outputs a combined signal of a sum and a difference of the intermediate frequency signals (e.sub.S and e.sub.P).

2. 发明授权

US5115332A Receiver for coherent optical communication 失效
标题翻译：接收器进行相干光通信
公开(公告)号：US5115332A
公开(公告)日：1992-05-19
申请号：US553744
申请日：1990-07-18
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda , Hideo Kuwahara
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda , Hideo Kuwahara
IPC分类号： H04B10/2513 , H04B10/61 , H04B10/63 , H04B10/64
CPC分类号： H04B10/61 , H04B10/2513 , H04B10/613 , H04B10/63 , H04B10/64
摘要： A receiver for coherent optical communication in a phase diversity system. An optical hybrid circuit receives a signal beam and receives a local-oscillator beam which has a predetermined phase shift. The optical hybrid circuit branches each beam into pairs, each pair having one signal beam and one local-oscillator beam. These beam pairs are output to first and second photodetectors which each apply a photoelectric conversion, thus producing first and second output signals. The output signals are output to an electrical 90.degree. hybrid circuit which shifts the first signal by 90.degree. and adds it to the second signal to produce a first output signal, and shifts the second signal by 90.degree. and adds it to the first signal to produce a second output signal. The first and second output signals are applied to first and second demodulators, respectively, which delay the signals by a delay corresponding to their frequency. The demodulators output the delayed signals to an adder which adds the two signals to produce an output signal. As a result, the receiver is capable of compensating the wavelength dispension is an optical fiber to secure an enhanced receiving sensitivity.

3. 发明授权

US5050176A Direct modulation phase-shift-keying system and method 失效
标题翻译：直接调制相移键控系统及方法
公开(公告)号：US5050176A
公开(公告)日：1991-09-17
申请号：US540284
申请日：1990-06-19
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
IPC分类号： H01S3/10 , H04B10/516 , H04B10/556 , H04B10/61 , H04L27/20 , H04L27/22 , H04L27/227 , H04L27/233
CPC分类号： H04L27/2331 , H04B10/50 , H04B10/504 , H04B10/5561 , H04B10/60 , H04B10/64 , H04L27/2096 , H04L27/223 , H04L27/2276
摘要： A direct modulation PSK system and method, in a coherent optical fiber transmission system, in which an injection current supplied to a laser diode is adapted to be directly varied is disclosed. In this system or method, a modulating current pulse is superposed on a bias current for the laser diode so that a specified phase condition may be satisfied. Thereby, a differential coding circuit and an external modulator being indispensable for a DPSK system become unnecessary and, in addition, the system becomes less susceptible to the influence of wavelength dispersion than the DPSK system and able to reproduce the carrier.

4. 发明授权

US5052051A Heterodyne receiver for coherent optical communication 失效
标题翻译：用于相干光通信的外差接收机
公开(公告)号：US5052051A
公开(公告)日：1991-09-24
申请号：US424732
申请日：1989-10-20
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda
IPC分类号： G02F2/00 , H04B10/07 , H04B10/516 , H04B10/61
CPC分类号： H04B10/61 , H04B10/614 , H04B10/64
摘要： After mixing the signal light and the local oscillation light with a mixing circuit, two intersecting polarization components are divided by a polarization splitter and respective components are subjected to heterodyne detection by optical receivers. Thereafter, in an electric signal stage, the intermediate frequency signal outputted from the optical receivers are applied to a 90-degree hybrid coupler and the output signal from one of the output ports is demodulated by a demodulator. On the other hand, an intermediate frequency signal outputted from the optical receivers are subjected to a subtraction to provide a principal axis angle monitor signal for the signal light. The signal outputted from the output port from the 90-degree hybrid coupler is used to monitor the elliptic ratio of the signal light and these monitor signals are applied to the polarization control circuit. The polarization control circuit drives the polarization operation apparatus based on said monitor signal to control the polarization state (i.e. a principal axis angle and the elliptic ratio) of the signal light to achieve the optimum state.

5. 发明授权

US5253097A Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator 失效
标题翻译：解调器和与解调器一起提供的相干光通信的偏振分集接收器
公开(公告)号：US5253097A
公开(公告)日：1993-10-12
申请号：US730002
申请日：1991-07-15
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Nakamoto , George Ishikawa
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Nakamoto , George Ishikawa
IPC分类号： H04B10/61 , H04B7/10 , H04B10/07 , H04B10/2507 , H04B10/516 , H04B10/556 , H04B10/564 , H04B10/572 , H04L27/227 , H04B10/06
CPC分类号： H04B10/61 , H04B10/614 , H04B10/64
摘要： A demodulator comprising an OR/NOR circuit, an exclusive OR/NOR circuit, and a delay circuit is disclosed as that capable of being suitably formed into a monolithic IC. Also, a polarization diversity receiver for coherent optical communication using the above demodulator as its constituent is disclosed as that having a smaller number of variable gain amplifiers and accordingly having the controlling circuit made simpler in structure.

6. 发明授权

US5228043A Direct modulation phase shift keying (DM-PSK) transmission system 失效
标题翻译：直接调制相移键控（DM-PSK）传输系统
公开(公告)号：US5228043A
公开(公告)日：1993-07-13
申请号：US730265
申请日：1991-07-15
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Hideo Kuwahara
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Hideo Kuwahara
IPC分类号： H04B10/516 , H04B10/07 , H04B10/2507 , H04B10/556 , H04B10/572 , H04B10/58 , H04B10/61 , H04L27/20 , H04L27/22 , H04L27/227
CPC分类号： H04L27/223 , H04B10/50 , H04B10/504 , H04B10/5561 , H04B10/60 , H04B10/64 , H04L27/2096
摘要： A direct modulation phase shift keying transmission system (DM-PSK transmission system) is disclosed for coherent optical fiber transmission in which an injection current supplied to a semiconductor laser is adapted to be directly modulated. This system presents useful features in automatic frequency control, demodulation, and phase noise suppression.

7. 发明授权

US5003626A Dual balanced optical signal receiver 失效
标题翻译：双平衡光信号接收机
公开(公告)号：US5003626A
公开(公告)日：1991-03-26
申请号：US433431
申请日：1989-11-08
申请人： Hideo Kuwahara , Terumi Chikama , Tetsuya Kiyonaga , Chiaki Ohsawa
发明人： Hideo Kuwahara , Terumi Chikama , Tetsuya Kiyonaga , Chiaki Ohsawa
IPC分类号： H04B10/61 , H04B10/63 , H04B10/64
CPC分类号： H04B10/61 , H04B10/614 , H04B10/63 , H04B10/64
摘要： An optical signal receiver comprising an optical mixing/polarization splitting unit for producing IF optical signals having two orthogonally polarized components, an optical signal receiving unit for producing four corresponding IF electric signals, and a combining circuit for combining two IF electric signals having one polarization with the other two IF electric signals having the other polarization, suppressing fluctuation of the polarization and the intensity noise of the related local optical signal. The intensity noise suppression is also effective for IF electric signals having a higher frequency range.
摘要翻译：一种光信号接收机，包括用于产生具有两个正交极化分量的IF光信号的光混合/偏振分离单元，用于产生四个对应的IF电信号的光信号接收单元，以及组合电路，用于将具有一个极化的两个IF电信号另外两个具有另一极化的IF电信号抑制偏振波动和相关局部光信号的强度噪声。强度噪声抑制对于具有较高频率范围的IF电信号也是有效的。

8. 发明授权

US5875054A Bidirectional optical amplifier circuit 失效
标题翻译：双向光放大器电路
公开(公告)号：US5875054A
公开(公告)日：1999-02-23
申请号：US690794
申请日：1996-08-01
申请人： Yoshihito Onoda , Terumi Chikama
发明人： Yoshihito Onoda , Terumi Chikama
IPC分类号： H01S3/07 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/0941 , H01S3/10 , H01S3/17 , H04B10/00 , H04B10/079 , H04B10/293 , H04B10/297 , H04B10/40 , H04B10/50 , H04B10/60 , G02F1/35 , H01S3/131 , H04B10/12
CPC分类号： H04B10/2972
摘要： Disclosed is a bidirectional optical amplifier circuit having a function that achieves reliable detection of reflections from an exposed end at low cost. Received optical power is detected; if the detected power is less than a prescribed discrimination level, it is then decided that the detected light is not received signal light but transmitted signal light sent in the direction opposite from it and reflected at an exposed fiber end, and the bias current for a laser diode in the opposite path is reduced to lower the optical output level of an EDF.
摘要翻译：公开了一种双向光放大器电路，其具有以低成本可靠地检测来自暴露端的反射的功能。检测到接收到的光功率; 如果检测到的功率小于规定的识别电平，则判定所检测的光未被接收到信号光，而是在与其相反的方向上发射并在曝光的光纤端反射的发射信号光，相反路径上的激光二极管减少以降低EDF的光输出电平。

9. 发明授权

US06738181B1 Optical sending apparatus and channel extension method 失效
标题翻译：光发送装置和信道扩展方法
公开(公告)号：US06738181B1
公开(公告)日：2004-05-18
申请号：US09650856
申请日：2000-08-29
申请人： Hiroshi Nakamoto , Takao Naito , Terumi Chikama
发明人： Hiroshi Nakamoto , Takao Naito , Terumi Chikama
IPC分类号： H04B1012
CPC分类号： H04B10/2525 , G02B6/2713 , G02B6/276 , G02B6/29376 , H04B10/506 , H04B2210/254
摘要： An optical sending apparatus of this invention includes a plurality of optical signal generating sections, a dispersion compensating section and a wavelength multiplexing section. The dispersion compensating section performs compensation with a predetermined chromatic dispersion value to at least one of polarized light generated by the optical signal generating sections while a predetermined state of polarized light is maintained. The wavelength multiplexing section combines output light outputted from the optical signal generating section with output light passing through the dispersion compensating section so that the polarized light of adjacent wavelengths crosses orthogonal to each other. The optical sending apparatus having such a construction can generate high-density WDM optical signals, the dispersion of which is compensated in advance, by a polarization crossing method.
摘要翻译：本发明的光发送装置包括多个光信号产生部分，色散补偿部分和波长复用部分。色散补偿部在保持预定的偏振光状态的同时，对由光信号产生部产生的偏振光中的至少一个进行预定的色散值的补偿。波长复用部将从光信号生成部输出的输出光与通过色散补偿部的输出光组合，使得相邻波长的偏振光彼此正交交叉。具有这种结构的光发送装置可以通过偏振交叉方法产生高分散的WDM光信号，其偏差被预先补偿。

10. 发明授权

US5729372A Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system 失效
公开(公告)号：US5729372A
公开(公告)日：1998-03-17
申请号：US712958
申请日：1996-09-12
申请人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
发明人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
IPC分类号： G02F1/35 , H01S3/10 , H04B1/16 , H04B10/2507 , H04B10/2563 , H04B10/29 , H04B10/291 , H04B10/516 , H04B10/61 , H04B10/04
CPC分类号： H04B10/2572 , H04B10/291 , H04B10/2912 , H04B10/2918 , H04B10/2939 , H04B1/163
摘要： The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.

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