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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

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.

4. 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.

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

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。

8. 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.

9. 发明授权

US5539566A Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system 失效
标题翻译：光通信系统的光传输方法及装置及光放大方法及装置
公开(公告)号：US5539566A
公开(公告)日：1996-07-23
申请号：US425974
申请日：1995-04-20
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 , H04B10/17 , 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.
摘要翻译：本发明提供一种光传输方法和装置，适用于通过海洋长达几千公里的远距离通信的光通信系统的终端装置，以及适于与中继器用于光通信系统。该方法和装置的改进在于，抑制光放大器中的过度损耗和分支比的变化，以抑制增益的变化，以抑制光通信的传输线上的损耗或增益的极化依赖性系统。光传输装置包括用于输出去偏振光的去极化光源和用于调制来自去偏振光源的光的外部调制器。

10. 发明授权

US5568305A Heterodyne receiver provided with a frequency discriminator for coherent lightwave communications 失效
标题翻译：带有用于相干光波通信的频率鉴别器的异步接收机
公开(公告)号：US5568305A
公开(公告)日：1996-10-22
申请号：US462565
申请日：1995-06-05
申请人： Takao Naito , Terumi Chikama , Hiroshi Onaka
发明人： Takao Naito , Terumi Chikama , Hiroshi Onaka
IPC分类号： H03D3/06 , H03D3/22 , H03D9/04 , H04B10/06
CPC分类号： H04B10/60 , H03D3/22 , H04B10/64 , H03D9/04
摘要： A heterodyne receiver including a frequency discriminator adapted such that a signal to be subjected to frequency discrimination is divided into two signals and mixed together after one of the divided signals has been given a delay time, and additionally provided with a filter, of which a cutoff frequency is determined according to the delay time, disposed in the front stage. This results in both improvement of accuracy in frequency identification and expansion of the capture range.
摘要翻译：一种外差接收机，包括频率鉴别器，其适于使得要被频率鉴别的信号被划分为两个信号，并且在一个分频信号被给予延迟时间之后混合在一起，并且另外设置有滤波器，其中截止频率根据延迟时间确定，处于前置阶段。这样可以提高频率识别的准确性和捕获范围的扩大。

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