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.

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).

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.

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.

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.

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。

公开(公告)号：US20060088322A1

公开(公告)日：2006-04-27

申请号：US11044181

申请日：2005-01-28

申请人： Yuka Kobayashi ,  Tetsuya Kiyonaga

发明人： Yuka Kobayashi ,  Tetsuya Kiyonaga

IPC分类号： H04B10/04

CPC分类号： H04B10/505 ,  H04B10/50575 ,  H04B10/564 ,  H04B10/58

摘要： An optical transmitter device capable of high-speed shutdown of optical output. A bias controller generates a low-frequency signal, extracts the frequency component of a low-frequency signal from an electrical signal fed back thereto, and compares the phase of the frequency component of the low-frequency signal generated thereby with that of the frequency component of the extracted low-frequency signal, to generate a direct-current voltage with which the operating point of an optical modulator is optimized. Using a half-wave voltage of the optical modulator and an optimum voltage, a bottom voltage calculation unit calculates a bottom voltage corresponding to a minimum of the operation characteristic curve of the modulator. A voltage selection unit selects the direct-current voltage during normal operation, to apply the optical modulator with a bias voltage derived from the direct-current voltage, and selects the bottom voltage at the time of shutdown, to apply the bottom voltage to the modulator.

摘要翻译： 一种能够高速关闭光输出的光发射机装置。 偏置控制器产生低频信号，从反馈的电信号中提取低频信号的频率分量，并将由此产生的低频信号的频率分量与频率分量的频率分量的相位进行比较 提取的低频信号，以产生最优化光调制器的工作点的直流电压。 使用光调制器的半波电压和最佳电压，底电压计算单元计算对应于调制器的操作特性曲线的最小值的底电压。 电压选择单元在正常操作期间选择直流电压，以从直流电压导出的偏置电压来施加光学调制器，并且在关闭时选择底部电压，将底部电压施加到调制器 。

公开(公告)号：US06501774B2

公开(公告)日：2002-12-31

申请号：US09983184

申请日：2001-10-23

申请人： Hiroshi Kuwahara ,  Norio Nagase ,  Setsuo Misaizu ,  Tetsuya Kiyonaga ,  Tomoyuki Otsuka ,  Motoyoshi Sekiya

发明人： Hiroshi Kuwahara ,  Norio Nagase ,  Setsuo Misaizu ,  Tetsuya Kiyonaga ,  Tomoyuki Otsuka ,  Motoyoshi Sekiya

IPC分类号： H01S313

CPC分类号： H01S5/0687 ,  H01S3/1317 ,  H01S5/06804 ,  H04B10/506 ,  H04B10/572 ,  H04J14/02

摘要： The optical transmission apparatus for multiple wavelengths according to the present invention comprises; a light source, a temperature control section for controlling the temperature of the light source, a temperature control (ATC) loop for controlling the operation of the temperature control section, and a wavelength control (AFC) loop. The ATC loop detects the temperature of the light source and feedback controls the operation of the temperature control section, so that the optical output wavelengths of the light source fall within a wavelength capture range corresponding to a target wavelength of the AFC loop. The AFC loop has a wavelength detection filter having a periodic transmission wavelength characteristic. After the operation of the ATC loop has stabilized, a wavelength capture operation is commenced, and the operation of the temperature control section is controlled so that the optical output wavelength of the light source is captured at a stable point corresponding to a target wavelength, among a plurality of stable points.

摘要翻译： 根据本发明的用于多个波长的光传输装置包括： 光源，用于控制光源的温度的温度控制部，用于控制温度控制部的动作的温度控制（ATC）回路和波长控制（AFC）回路。 ATC环路检测光源的温度，并且反馈控制温度控制部分的操作，使得光源的光输出波长落在对应于AFC回路的目标波长的波长捕获范围内。 AFC回路具有具有周期性透射波长特性的波长检测滤波器。 在ATC环路的操作稳定后，开始波长捕获操作，并且控制温度控制部分的操作，使得在与目标波长相对应的稳定点捕获光源的光输出波长，其中 多个稳定点。

公开(公告)号：US07215894B2

公开(公告)日：2007-05-08

申请号：US11044181

申请日：2005-01-28

申请人： Yuka Kobayashi ,  Tetsuya Kiyonaga

发明人： Yuka Kobayashi ,  Tetsuya Kiyonaga

IPC分类号： H04B10/12

CPC分类号： H04B10/505 ,  H04B10/50575 ,  H04B10/564 ,  H04B10/58

摘要： An optical transmitter device capable of high-speed shutdown of optical output. A bias controller generates a low-frequency signal, extracts the frequency component of a low-frequency signal from an electrical signal fed back thereto, and compares the phase of the frequency component of the low-frequency signal generated thereby with that of the frequency component of the extracted low-frequency signal, to generate a direct-current voltage with which the operating point of an optical modulator is optimized. Using a half-wave voltage of the optical modulator and an optimum voltage, a bottom voltage calculation unit calculates a bottom voltage corresponding to a minimum of the operation characteristic curve of the modulator. A voltage selection unit selects the direct-current voltage during normal operation, to apply the optical modulator with a bias voltage derived from the direct-current voltage, and selects the bottom voltage at the time of shutdown, to apply the bottom voltage to the modulator.

摘要翻译： 一种能够高速关闭光输出的光发射机装置。 偏置控制器产生低频信号，从反馈的电信号中提取低频信号的频率分量，并将由此产生的低频信号的频率分量与频率分量的频率分量的相位进行比较 提取的低频信号，以产生最优化光调制器的工作点的直流电压。 使用光调制器的半波电压和最佳电压，底电压计算单元计算对应于调制器的操作特性曲线的最小值的底电压。 电压选择单元在正常操作期间选择直流电压，以从直流电压导出的偏置电压来施加光学调制器，并且在关闭时选择底部电压，将底部电压施加到调制器 。

公开(公告)号：US5652767A

公开(公告)日：1997-07-29

申请号：US406321

申请日：1995-03-17

申请人： Tetsuya Kiyonaga ,  Tetsuo Watanabe ,  Tatsuro Kunikane ,  Hiroyuki Furukawa ,  Yoshimitsu Sakai ,  Sadayuki Miyata ,  Takeo Iwama

发明人： Tetsuya Kiyonaga ,  Tetsuo Watanabe ,  Tatsuro Kunikane ,  Hiroyuki Furukawa ,  Yoshimitsu Sakai ,  Sadayuki Miyata ,  Takeo Iwama

IPC分类号： H04B10/60 ,  H04B10/071 ,  H04B10/2507 ,  H04B10/40 ,  H04B10/50 ,  H04B10/564 ,  H04B10/58 ,  H04B10/67 ,  H04B10/69 ,  H04J14/00 ,  H04J14/02 ,  H04L7/00 ,  H04L7/027 ,  H04L7/033 ,  H04L25/03 ,  H04L25/06 ,  H04L25/08 ,  H03D1/00 ,  G08C19/36 ,  H04L7/02

CPC分类号： H04L7/0338 ,  H04J14/00 ,  H04J14/0246 ,  H04J14/025 ,  H04L25/069 ,  H04L7/0075 ,  H04J14/0226 ,  H04J14/0279

摘要： An optical parallel receiving module receives optical signals transmitted in parallel in a plurality of channels by using optical fibers. The optical parallel receiving module includes photo-electric conversion elements for converting received signals which are electric signals as received signals, limiter amplifiers for comparing the received signals and a threshold level, and data decision circuits for recognizing data at a timing in every period of received data using a reference clock. Each of the data decision circuits includes a data edge position detecting unit for detecting in which region of a plurality of regions a rising edge of the received data is and for outputting a detecting signal corresponding to a detected region, one period of the received data having a reference phase equal to a phase of the reference clock signal being divided into the plurality of regions; and a data acquisition unit to which a plurality of clocks having different phases and the detecting signal from the data edge position detecting unit are supplied, each of the plurality of clocks corresponding to one of the plurality of regions, for acquiring data at a timing of a clock corresponding to the region in which the rising edge of the received data is detected by the data edge position detecting unit.

摘要翻译： 光并行接收模块通过使用光纤接收在多个信道中并行发送的光信号。 光并行接收模块包括用于转换作为电信号的接收信号作为接收信号的光电转换元件，用于比较接收信号的限幅放大器和阈值电平，以及用于在接收到的每个周期中的定时识别数据的数据判定电路 数据使用参考时钟。 每个数据判定电路包括数据边缘位置检测单元，用于检测接收数据的上升沿的多个区域的哪个区域，并输出与检测区域对应的检测信号，所接收的数据的一个周期具有 参考相位等于参考时钟信号的相位被分成多个区域; 以及数据采集单元，向其提供具有不同相位的多个时钟和来自数据边缘位置检测单元的检测信号，所述多个时钟中的每一个对应于所述多个区域中的一个，用于在定时 对应于由数据边缘位置检测单元检测到接收数据的上升沿的区域的时钟。