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：US08630552B2

公开(公告)日：2014-01-14

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

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.

公开(公告)号：US08873973B2

公开(公告)日：2014-10-28

申请号：US13446177

申请日：2012-04-13

申请人： Kosuke Komaki ,  Hisao Nakashima

发明人： Kosuke Komaki ,  Hisao Nakashima

IPC分类号： H04B10/06 ,  H04B10/2569 ,  H04B10/2507 ,  H04B10/69

CPC分类号： H04B10/25073 ,  H04B10/2569 ,  H04B10/6971 ,  H04L7/0087 ,  H04L7/0335

摘要： A digital coherent receiver includes a sampling phase detector to detect a phase of a sampled digital signal, and a phase adjustor to adjust the sampling phase of the digital signal based upon the detected phase. The phase detector includes filters to equalize the digital signal with different equalization characteristics; sensitivity monitoring phase detectors, each connected to one of the filters and outputting a phase detection signal representing the phase of the output signal from the associated filter together with a sensitivity monitoring signal representing the sensitivity of the phase detection; sensitivity correction coefficient generators, each generating a sensitivity correction coefficient for correcting the associated phase detection signal using a square sum of the sensitivity monitoring signals; and an adder to add the phase detection signals that have been corrected by the sensitivity correction coefficients, and output a phase signal.

摘要翻译： 数字相干接收机包括：采样相位检测器，用于检测采样数字信号的相位;以及相位调节器，用于根据检测到的相位调整数字信号的采样相位。 相位检测器包括滤波器，以均衡具有不同均衡特性的数字信号; 灵敏度监视相位检测器，每个检测器连接到滤波器之一并输出表示来自相关滤波器的输出信号的相位的相位检测信号以及表示相位检测的灵敏度的灵敏度监视信号; 灵敏度校正系数发生器，每个灵敏度校正系数发生器使用平方和的灵敏度监视信号产生用于校正相关联的相位检测信号的灵敏度校正系数; 以及加法器，将通过灵敏度校正系数校正的相位检测信号相加，并输出相位信号。

公开(公告)号：US08693898B2

公开(公告)日：2014-04-08

申请号：US13317297

申请日：2011-10-14

申请人： Nobukazu Koizumi ,  Kazuhiko Hatae ,  Noriyasu Nakayama ,  Koji Nakamuta ,  Hisao Nakashima ,  Kosuke Komaki

发明人： Nobukazu Koizumi ,  Kazuhiko Hatae ,  Noriyasu Nakayama ,  Koji Nakamuta ,  Hisao Nakashima ,  Kosuke Komaki

IPC分类号： H04B10/06

CPC分类号： H04B10/613 ,  H04B10/614 ,  H04B10/616 ,  H04L25/03044 ,  H04L27/223

摘要： An adaptive equalizer includes a finite impulse response filter with a predetermined number of taps; and a tap coefficient adaptive controller having a register to hold tap coefficients for the filter, a weighted center calculator to calculate a weighted center of the tap coefficients, and a tap coefficient shifter to shift the tap coefficients based on a calculation result of the weighted center. During an initial training period, the tap coefficient shifter shifts the tap coefficients on a symbol data basis such that a difference between the calculated weighted center of the tap coefficients and a tap center defined by the number of taps is minimized.

摘要翻译： 自适应均衡器包括具有预定数量抽头的有限脉冲响应滤波器; 以及具有用于保持滤波器的抽头系数的寄存器的抽头系数自适应控制器，用于计算抽头系数的加权中心的加权中心计算器，以及基于加权中心的计算结果来移位抽头系数的抽头系数移位器 。 在初始训练期间，抽头系数移位器基于符号数据移动抽头系数，使得所计算的抽头系数的加权中心与由抽头数量定义的抽头中心之间的差最小化。

公开(公告)号：US20120134684A1

公开(公告)日：2012-05-31

申请号：US13317297

申请日：2011-10-14

申请人： Nobukazu Koizumi ,  Kazuhiko Hatae ,  Noriyasu Nakayama ,  Koji Nakamuta ,  Hisao Nakashima ,  Kosuke Komaki

发明人： Nobukazu Koizumi ,  Kazuhiko Hatae ,  Noriyasu Nakayama ,  Koji Nakamuta ,  Hisao Nakashima ,  Kosuke Komaki

IPC分类号： H04B10/06 ,  H04L27/01

CPC分类号： H04B10/613 ,  H04B10/614 ,  H04B10/616 ,  H04L25/03044 ,  H04L27/223

摘要： An adaptive equalizer includes a finite impulse response filter with a predetermined number of taps; and a tap coefficient adaptive controller having a register to hold tap coefficients for the filter, a weighted center calculator to calculate a weighted center of the tap coefficients, and a tap coefficient shifter to shift the tap coefficients based on a calculation result of the weighted center. During an initial training period, the tap coefficient shifter shifts the tap coefficients on a symbol data basis such that a difference between the calculated weighted center of the tap coefficients and a tap center defined by the number of taps is minimized.

摘要翻译： 自适应均衡器包括具有预定数量抽头的有限脉冲响应滤波器; 以及具有用于保持滤波器的抽头系数的寄存器的抽头系数自适应控制器，用于计算抽头系数的加权中心的加权中心计算器，以及基于加权中心的计算结果来移位抽头系数的抽头系数移位器 。 在初始训练期间，抽头系数移位器基于符号数据移动抽头系数，使得所计算的抽头系数的加权中心与由抽头数量定义的抽头中心之间的差最小化。

公开(公告)号：US08670678B2

公开(公告)日：2014-03-11

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： H04B10/06

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：US20120051754A1

公开(公告)日：2012-03-01

申请号：US13177644

申请日：2011-07-07

申请人： Takeshi SAKAMOTO ,  Kosuke Komaki

发明人： Takeshi SAKAMOTO ,  Kosuke Komaki

IPC分类号： H04B10/06 ,  H04B10/00

CPC分类号： H04B10/032 ,  H04B10/07951 ,  H04B10/07953 ,  H04B10/616

摘要： An optical receiver includes: an optical to electric converter that converts a received optical signal into an analog electric signal; an analog to digital converter that converts the analog electric signal obtained by the optical to electric converter into a digital signal; a digital signal processor that performs wave shaping on the digital signal; an information extract circuit that extracts information related to loss or deterioration of the optical signal from a signal propagating from the analog to digital converter to the digital signal processor or a signal in the digital signal processor; and a judging circuit that judges, based on the information extracted by the information extract circuit, whether the optical signal is lost or deteriorates.

摘要翻译： 一种光接收机包括：光接收电转换器，将接收到的光信号转换为模拟电信号; 将由光电转换器获得的模拟电信号转换为数字信号的模数转换器; 数字信号处理器，对数字信号进行波形整形; 信息提取电路，从从模数转换器传播到数字信号处理器的信号或数字信号处理器中的信号中提取与光信号的丢失或劣化有关的信息; 以及判断电路，其基于由信息提取电路提取的信息判断光信号是丢失还是劣化。

公开(公告)号：US07899331B2

公开(公告)日：2011-03-01

申请号：US11882094

申请日：2007-07-30

申请人： Hiroyuki Itoh ,  Kosuke Komaki

发明人： Hiroyuki Itoh ,  Kosuke Komaki

IPC分类号： H04J14/02

CPC分类号： H04J14/0221

摘要： According to a WDM optical transmission system of the present invention, wavelength numbers information of a WDM signal light output from an upstream side optical amplifying unit to a transmission path fiber, and signal output level information thereof are transmitted to a downstream side optical amplifying unit utilizing a supervisory control light. In the downstream side optical amplifying unit, a loss (span loss) in the transmission path fiber is computed using the upstream side signal output level information and downstream side signal input level information, so that a gain to be set for a downstream side optical amplifier is calculated based on the computed loss, and also, the gain is corrected based on a difference between a target value of the signal output level computed using the wavelength numbers information and an actual measurement value thereof, so that the optical amplifier is controlled in accordance with the post-corrected gain. As a result, it becomes possible to reduce an influence by a measurement error of the span loss, to thereby control the optical amplifier at a high-speed and with high precision.

摘要翻译： 根据本发明的WDM光传输系统，将从上游侧光放大单元输出到传输路径光纤的WDM信号光的波长数信息及其信号输出电平信息发送到下游侧光放大单元，利用 监控灯。 在下游侧光放大单元中，使用上游侧信号输出电平信息和下行侧信号输入电平信息计算传输路径光纤中的损耗（跨度损耗），使得对下游侧光放大器设定的增益 是基于计算出的损耗计算的，并且还基于使用波长数信息计算的信号输出电平的目标值与其实际测量值之间的差来校正增益，使得光放大器按照 与修正后的收益。 结果，可以减小跨度损失的测量误差的影响，从而以高速和高精度控制光放大器。

公开(公告)号：US07756422B2

公开(公告)日：2010-07-13

申请号：US11502535

申请日：2006-08-11

申请人： Takeshi Sakamoto ,  Kosuke Komaki ,  Yuji Shimada ,  Takuji Maeda

发明人： Takeshi Sakamoto ,  Kosuke Komaki ,  Yuji Shimada ,  Takuji Maeda

IPC分类号： H04B10/00

CPC分类号： H04B10/07

摘要： During initial start-up of an optical communication system, an ASE reference span loss is calculated based on transmitting power and received power of ASE light generated by an optical amplifier, and an OSC reference span loss is calculated based on the transmitting power and the received power of OSC light. During normal operation of the optical communication system, a span loss is calculated using the OSC light, and an amount of change in the span loss representing a difference between the span loss and the OSC reference span loss is calculated. A current span loss between a transmitting station and a receiving station is calculated by adding the amount of change in the span loss to the ASE reference span loss.

摘要翻译： 在光通信系统的初始启动期间，基于由光放大器产生的ASE光的发射功率和接收功率来计算ASE参考跨度损耗，并且基于发射功率和接收到的功率来计算OSC参考跨度损耗 OSC灯的功率。 在光通信系统的正常工作期间，使用OSC灯计算跨度损耗，并且计算表示跨度损耗与OSC参考跨度损耗之间的差异的跨度损耗的变化量。 通过将跨度损耗的变化量与ASE参考跨度损耗相加来计算发送站和接收站之间的电流跨度损耗。

公开(公告)号：US20080080867A1

公开(公告)日：2008-04-03

申请号：US11882094

申请日：2007-07-30

申请人： Hiroyuki Itoh ,  Kosuke Komaki

发明人： Hiroyuki Itoh ,  Kosuke Komaki

IPC分类号： H04J14/02

CPC分类号： H04J14/0221

摘要： According to a WDM optical transmission system of the present invention, wavelength numbers information of a WDM signal light output from an upstream side optical amplifying unit to a transmission path fiber, and signal output level information thereof are transmitted to a downstream side optical amplifying unit utilizing a supervisory control light. In the downstream side optical amplifying unit, a loss (span loss) in the transmission path fiber is computed using the upstream side signal output level information and downstream side signal input level information, so that a gain to be set for a downstream side optical amplifier is calculated based on the computed loss, and also, the gain is corrected based on a difference between a target value of the signal output level computed using the wavelength numbers information and an actual measurement value thereof, so that the optical amplifier is controlled in accordance with the post-corrected gain. As a result, it becomes possible to reduce an influence by a measurement error of the span loss, to thereby control the optical amplifier at a high-speed and with high precision.

摘要翻译： 根据本发明的WDM光传输系统，将从上游侧光放大单元输出到传输路径光纤的WDM信号光的波长数信息及其信号输出电平信息发送到下游侧光放大单元，利用 监控灯。 在下游侧光放大单元中，使用上游侧信号输出电平信息和下行侧信号输入电平信息计算传输路径光纤中的损耗（跨度损耗），使得对下游侧光放大器设定的增益 是基于计算出的损耗计算的，并且还基于使用波长数信息计算的信号输出电平的目标值与其实际测量值之间的差来校正增益，使得光放大器按照 与修正后的收益。 结果，可以减小跨度损失的测量误差的影响，从而以高速和高精度控制光放大器。