公开(公告)号：US08660438B2

公开(公告)日：2014-02-25

申请号：US13083723

申请日：2011-04-11

申请人： Hisao Nakashima ,  Takeshi Hoshida ,  Kosuke Komaki

发明人： Hisao Nakashima ,  Takeshi Hoshida ,  Kosuke Komaki

IPC分类号： H04B10/06

CPC分类号： H04B10/611 ,  H04B10/6164 ,  H04L27/223

摘要： A digital coherent receiver includes a front end, an A/D convertor, and a processor. The front end converts a light signal into an electric signal by using a signal light and a local oscillator light. The A/D convertor converts the electric signal of the front end into a digital signal. The processor calculates a spectrum gravity center of the digital signal converted by the A/D convertor, estimates a frequency offset of the digital signal based on the calculated spectrum gravity center, and reduces the frequency offset of the digital signal based on the estimated frequency offset.

摘要翻译： 数字相干接收机包括前端，A / D转换器和处理器。 前端通过使用信号灯和本地振荡器光将光信号转换为电信号。 A / D转换器将前端的电信号转换为数字信号。 处理器计算由A / D转换器转换的数字信号的频谱重心，基于所计算的频谱重心估计数字信号的频率偏移，并且基于估计的频率偏移来减少数字信号的频率偏移 。

公开(公告)号：US08478137B2

公开(公告)日：2013-07-02

申请号：US13017874

申请日：2011-01-31

申请人： Kosuke Komaki ,  Masahiro Shioda ,  Katsumi Fukumitsu ,  Osamu Takeuchi

发明人： Kosuke Komaki ,  Masahiro Shioda ,  Katsumi Fukumitsu ,  Osamu Takeuchi

IPC分类号： H04B10/06

CPC分类号： H04B10/6971 ,  H04B10/61 ,  H04B10/611 ,  H04B10/613 ,  H04B10/6151 ,  H04B10/6161 ,  H04B10/6165 ,  H04L7/0004 ,  H04L7/0335 ,  H04L27/223 ,  H04L27/227

摘要： An optical receiver includes: a waveform distortion compensator to perform an operation on digital signal representing an optical signal generated by an A/D converter to compensate for waveform distortion of the optical signal; a phase detector to generate phase information representing sampling phase of the A/D converter; a phase adjuster to generate digital signal representing an optical signal in which the sampling phase of the A/D converter is adjusted from an output signal of the waveform distortion compensator using the phase information; a demodulator to generate a demodulated signal from the output signal of the phase adjuster; a phase controller to control the sampling phase of the A/D converter; a peak detector to detect a peak value of the phase information while the sampling phase of the A/D converter is controlled by the phase controller; and a compensation controller to control the waveform distortion compensator using the peak value.

摘要翻译： 光接收器包括：波形失真补偿器，用于对表示由A / D转换器产生的光信号的数字信号进行操作以补偿光信号的波形失真; 相位检测器，用于产生表示A / D转换器的采样相位的相位信息; 相位调节器，用于产生代表使用相位信息的波形失真补偿器的输出信号调整A / D转换器的采样相位的光信号的数字信号; 解调器，用于从所述相位调节器的输出信号产生解调信号; 控制A / D转换器采样相位的相位控制器; 峰值检测器，用于在由相位控制器控制A / D转换器的采样相位时检测相位信息的峰值; 以及使用峰值来控制波形失真补偿器的补偿控制器。

公开(公告)号：US20120087669A1

公开(公告)日：2012-04-12

申请号：US13252201

申请日：2011-10-04

申请人： Koji BIWA ,  Kosuke KOMAKI

发明人： Koji BIWA ,  Kosuke KOMAKI

IPC分类号： H04J14/02

CPC分类号： H04J14/0221 ,  H04B10/0773 ,  H04J14/0276

摘要： In an optical node, a transmitter produces an optical supervisory signal for supervising an optical network, a processor is operative to control a power level of the optical supervisory signal according to a per-wavelength power level of an optical communication signal when the optical node has no post amplifiers, and a multiplexer combines the controlled optical supervisory signal with the optical communication signal to be transmitted to another optical node located downstream.

摘要翻译： 在光节点中，发射机产生用于监视光网络的光监控信号，当光节点具有光通信信号时，处理器可操作以根据光通信信号的每波长功率电平来控制光监控信号的功率电平 没有后置放大器，并且多路复用器将受控光监控信号与要发送到位于下游的另一光节点的光通信信号组合。

公开(公告)号：US20110255877A1

公开(公告)日：2011-10-20

申请号：US13083723

申请日：2011-04-11

申请人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Kosuke KOMAKI

发明人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Kosuke KOMAKI

IPC分类号： H04B10/06

CPC分类号： H04B10/611 ,  H04B10/6164 ,  H04L27/223

摘要： A digital coherent receiver includes a front end, an A/D convertor, and a processor. The front end converts a light signal into an electric signal by using a signal light and a local oscillator light. The A/D convertor converts the electric signal of the front end into a digital signal. The processor calculates a spectrum gravity center of the digital signal converted by the A/D convertor, estimates a frequency offset of the digital signal based on the calculated spectrum gravity center, and reduces the frequency offset of the digital signal based on the estimated frequency offset.

摘要翻译： 数字相干接收机包括前端，A / D转换器和处理器。 前端通过使用信号灯和本地振荡器光将光信号转换为电信号。 A / D转换器将前端的电信号转换为数字信号。 处理器计算由A / D转换器转换的数字信号的频谱重心，基于所计算的频谱重心估计数字信号的频率偏移，并且基于估计的频率偏移来减少数字信号的频率偏移 。

公开(公告)号：US20110229128A1

公开(公告)日：2011-09-22

申请号：US13004532

申请日：2011-01-11

申请人： Takeshi SAKAMOTO ,  Katsumi FUKUMITSU ,  Kosuke KOMAKI

发明人： Takeshi SAKAMOTO ,  Katsumi FUKUMITSU ,  Kosuke KOMAKI

IPC分类号： H04B10/08

CPC分类号： H04B10/0775 ,  H04B2210/074 ,  H04B2210/078

摘要： An optical node disposed along a transmission line that uses optical fiber. The optical node includes a first signal generator and a monitor. The first signal generator generates a first measurement signal for measuring polarization mode dispersion values and transmits the first measurement signal along the transmission line. The monitor detects a second measurement signal from the transmission line and measures polarization mode dispersion values by performing signal processing with respect to the second measurement signal.

摘要翻译： 沿着使用光纤的传输线设置的光学节点。 光节点包括第一信号发生器和监视器。 第一信号发生器产生用于测量偏振模色散值的第一测量信号，并沿传输线发送第一测量信号。 监视器从传输线检测第二测量信号，并通过对第二测量信号执行信号处理来测量偏振模色散值。

公开(公告)号：US20110229127A1

公开(公告)日：2011-09-22

申请号：US13034082

申请日：2011-02-24

申请人： Yuichirou SAKAMOTO ,  Kosuke Komaki

发明人： Yuichirou SAKAMOTO ,  Kosuke Komaki

IPC分类号： H04B17/00

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/6165

摘要： A digital coherent receiver converts signals and local light respectively detected, as detection results, in signal light from an optical transmission line, into digital signals and that further applies digital processing to the digital signals. The receiver includes a skew detecting unit that detects skew between the digital signals; a skew control unit controls the skew of each of the signals so that the skew to be detected by the skew detecting unit will be reduced; and a demodulating unit that demodulates each signal controlled for skew by the skew control unit.

摘要翻译： 数字相干接收机将来自光传输线的信号光中的检测结果分别检测的信号和局部光转换为数字信号，并进一步对数字信号进行数字处理。 接收机包括检测数字信号之间的偏斜的偏斜检测单元; 偏斜控制单元控制每个信号的偏斜，从而减少由偏斜检测单元检测的偏斜; 以及解调单元，其对由偏斜控制单元控制的偏斜信号进行解调。

公开(公告)号：US20090257115A1

公开(公告)日：2009-10-15

申请号：US12489956

申请日：2009-06-23

申请人： Kosuke KOMAKI ,  Yuji Tamura

发明人： Kosuke KOMAKI ,  Yuji Tamura

IPC分类号： H01S3/00

CPC分类号： H04B10/2935 ,  H01S3/2316 ,  H04B10/0797

摘要： An optical amplifier includes a first optical amplification unit that amplifies input light, a variable optical attenuation unit that attenuates an output of the first optical amplification unit, a second optical amplification unit that amplifies an output of the variable optical attenuation unit, and a loss amount control unit that controls the variable optical attenuation unit, wherein an external attenuating optical medium is inserted between the variable optical attenuation unit and the second optical amplification unit. The optical amplifier includes an abnormality detecting unit that detects abnormality in optical loss based on a light level between the external attenuating optical medium and the second optical amplification unit, and a detection invalidating unit that invalidates any abnormality detected by the abnormality detecting unit when a light level between the variable optical attenuation unit and the external attenuating optical medium is lower than a threshold level.

摘要翻译： 光放大器包括放大输入光的第一光放大单元，衰减第一光放大单元的输出的可变光衰减单元，放大可变光衰减单元的输出的第二光放大单元， 控制单元，其控制可变光衰减单元，其中在可变光衰减单元和第二光放大单元之间插入外部衰减光介质。 光放大器包括：异常检测单元，其基于外部衰减光学介质和第二光学放大单元之间的光级检测光损耗的异常;以及检测无效单元，其使得当灯处于异常检测单元时检测到的异常 可变光衰减单元和外部衰减光介质之间的电平低于阈值电平。

公开(公告)号：US20070109630A1

公开(公告)日：2007-05-17

申请号：US11396551

申请日：2006-04-04

申请人： Kosuke Komaki ,  Hiroyuki Itoh

发明人： Kosuke Komaki ,  Hiroyuki Itoh

IPC分类号： H01S3/00

CPC分类号： H04B10/296 ,  H04B2210/003

摘要： Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal light attenuation caused by a variable optical attenuator and the external attenuating medium connected in series, by means of a front optical detection section provided before the variable optical attenuator and the external attenuating medium and a back optical detection section provided thereafter. An attenuation amount control section controls the variable optical attenuator such that the amount of signal light attenuation detected by the attenuation amount detection section is kept constant. A connection detection section detects a connection or disconnection of the external attenuating medium in accordance with the amount of signal light attenuation obtained when the amount of attenuation caused by the variable optical attenuator is minimized.

摘要翻译： 可以消除在外部衰减介质之前需要光学检测部分的光放大器，可以防止SN降级，并且可以减少泵浦光所需的功率。 衰减量检测部分通过设置在可变光衰减器和外部衰减介质之前的前光检测部分和后光学器件来检测由可变光衰减器和外部衰减介质串联连接的信号光衰减量 检测部分。 衰减量控制部分控制可变光衰减器，使得衰减量检测部分检测到的信号光衰减量保持不变。 连接检测部分根据由可变光衰减器引起的衰减量最小化时获得的信号光衰减量来检测外部衰减介质的连接或断开。

公开(公告)号：US07202997B2

公开(公告)日：2007-04-10

申请号：US10716361

申请日：2003-11-17

申请人： Hiroshi Iizuka ,  Kosuke Komaki ,  Hiroyuki Itou

发明人： Hiroshi Iizuka ,  Kosuke Komaki ,  Hiroyuki Itou

IPC分类号： H04B10/17

CPC分类号： H04B10/2942 ,  H01S3/06758 ,  H01S3/0912 ,  H01S3/1003 ,  H01S3/10069 ,  H01S3/1301

摘要： An optical amplifier includes first and second optical amplifier units, a variable optical attenuator optically coupled between the first and second optical amplifier units, a first control unit to control gains of the first and second optical amplifier units based on an input of the first optical amplifier unit and an output of the second optical amplifier unit, and a second control unit to control an attenuation quantity of the variable optical attenuator based on the input and an output of the first optical amplifier unit and an input and the output of the second optical amplifier unit.

摘要翻译： 光放大器包括第一和第二光放大器单元，光耦合在第一和第二光放大器单元之间的可变光衰减器，第一控制单元，用于基于第一光放大器的输入来控制第一和第二光放大器单元的增益 单元和第二光放大器单元的输出，以及第二控制单元，用于基于第一光放大器单元的输入和输出以及第二光放大器的输出和输出来控制可变光衰减器的衰减量 单元。

公开(公告)号：US07145717B2

公开(公告)日：2006-12-05

申请号：US10793273

申请日：2004-03-05

申请人： Masao Nakata ,  Kosuke Komaki ,  Yoshio Shimano

发明人： Masao Nakata ,  Kosuke Komaki ,  Yoshio Shimano

IPC分类号： H04B10/12

CPC分类号： H04B10/296 ,  H01S3/10015 ,  H01S3/1301 ,  H01S5/0617

摘要： An optical amplifier that improves transmission quality by driving an excitation light source according to a change in the level of an input optical signal and by compensating for a change in the characteristics of the excitation light source. An optical amplification section includes an amplification medium doped with an active substance for optical amplification and an excitation light source for emitting excitation light. A constant-gain control section finds out target excitation light power to be set according to a change in the level of an input optical signal on the basis of a correlation between a gain and excitation light power to obtain a target gain, finds out a target drive signal for making the excitation light source emit the target excitation light power on the basis of a correlation between a drive signal for driving the excitation light source and excitation light power, and exercises constant-gain control over the optical amplification section by a feedforward control system.

摘要翻译： 一种光放大器，其通过根据输入光信号的电平的变化驱动激励光源并补偿激发光源的特性的变化来提高传输质​​量。 光放大部分包括掺杂有用于光放大的活性物质的放大介质和用于发射激发光的激发光源。 恒定增益控制部根据增益与激励光功率之间的相关关系，根据输入光信号的电平的变化，求出要设定的目标激励光功率，求出目标增益，求出目标 驱动信号用于使激发光源基于用于驱动激励光源的驱动信号与激励光功率之间的相关性发射目标激励光功率，并且通过前馈控制对光放大部分进行恒定增益控制 系统。