公开(公告)号：US08553825B2

公开(公告)日：2013-10-08

申请号：US12708859

申请日：2010-02-19

申请人： Kiichi Sugitani ,  Kazunari Shiota ,  Yuji Ishii ,  Hisao Nakashima

发明人： Kiichi Sugitani ,  Kazunari Shiota ,  Yuji Ishii ,  Hisao Nakashima

IPC分类号： H04L7/00

CPC分类号： H04B10/61

摘要： A phase synchronization method uses a removal path for removing an error component contained in an input signal and a delay addition path for adding a delay corresponding to a processing time period taken to remove the error component in the removal path. The removal path includes an averaging section. The averaging section includes a shift register and an obtaining unit. The shift register stores as many data as the maximum number of data to be averaged and successively receives processing data from which the error component has been extracted in the removal path. The obtaining unit obtains, among the successive processing data input to the shift register, as many processing data as the number of data to be averaged from a position near the center toward both ends in the shift register.

摘要翻译： 相位同步方法使用去除包含在输入信号中的误差分量的去除路径和用于增加与去除去除路径中的误差分量所花费的处理时间相对应的延迟的延迟相加路径。 去除路径包括平均部分。 平均部分包括移位寄存器和获取单元。 移位寄存器存储与要平均的数据的最大数量一样多的数据，并且连续地接收在删除路径中从其中提取了错误分量的处理数据。 获取单元从输入到移位寄存器的连续处理数据中，从移位寄存器中的中心附近的位置到两端的位置获得与要平均化的数据数量相同的处理数据。

公开(公告)号：US20100239269A1

公开(公告)日：2010-09-23

申请号：US12708859

申请日：2010-02-19

申请人： Kiichi SUGITANI ,  Kazunari Shiota ,  Yuji Ishii ,  Hisao Nakashima

发明人： Kiichi SUGITANI ,  Kazunari Shiota ,  Yuji Ishii ,  Hisao Nakashima

IPC分类号： H04L7/02 ,  H04B10/06

CPC分类号： H04B10/61

摘要： A phase synchronization method uses a removal path for removing an error component contained in an input signal and a delay addition path for adding a delay corresponding to a processing time period taken to remove the error component in the removal path. The removal path includes an averaging section. The averaging section includes a shift register and an obtaining unit. The shift register stores as many data as the maximum number of data to be averaged and successively receives processing data from which the error component has been extracted in the removal path. The obtaining unit obtains, among the successive processing data input to the shift register, as many processing data as the number of data to be averaged from a position near the center toward both ends in the shift register.

摘要翻译： 相位同步方法使用去除包含在输入信号中的误差分量的去除路径和用于增加与去除去除路径中的误差分量所花费的处理时间相对应的延迟的延迟相加路径。 去除路径包括平均部分。 平均部分包括移位寄存器和获取单元。 移位寄存器存储与要平均的数据的最大数量一样多的数据，并且连续地接收在删除路径中从其中提取了错误分量的处理数据。 获取单元从输入到移位寄存器的连续处理数据中，从移位寄存器中的中心附近的位置到两端的位置获得与要平均化的数据数量相同的处理数据。

公开(公告)号：US08447190B2

公开(公告)日：2013-05-21

申请号：US12697202

申请日：2010-01-29

申请人： Takahito Tanimura ,  Takeshi Hoshida ,  Hisao Nakashima ,  Kazunari Shiota ,  Kiichi Sugitani

发明人： Takahito Tanimura ,  Takeshi Hoshida ,  Hisao Nakashima ,  Kazunari Shiota ,  Kiichi Sugitani

IPC分类号： H04B10/06 ,  H04B10/08 ,  H04B10/12 ,  H04B10/00 ,  H04J14/02

CPC分类号： H04B10/6971 ,  H04B10/25133 ,  H04B10/616 ,  H04B10/6161 ,  H04B2210/252

摘要： A distortion compensating apparatus which compensates for distortion in a waveform of a received light signal through a digital signal processing includes a plurality of fixed amount compensators which compensate for the distortion in the waveform at respective given compensating amounts. The combination of operating states of the plurality of fixed amount compensators is changed by on/off switching of each of the plurality of fixed amount compensators, and the plurality of fixed amount compensators are cascaded.

摘要翻译： 通过数字信号处理补偿接收的光信号的波形中的失真的失真补偿装置包括多个固定量补偿器，其补偿各个给定补偿量处的波形失真。 通过多个固定量补偿器中的每一个的开/关切换来改变多个固定量补偿器的操作状态的组合，并且多个固定量补偿器被级联。

公开(公告)号：US20100196017A1

公开(公告)日：2010-08-05

申请号：US12697202

申请日：2010-01-29

申请人： Takahito TANIMURA ,  Takeshi Hoshida ,  Hisao Nakashima ,  Kazunari Shiota ,  Kiichi Sugitani

发明人： Takahito TANIMURA ,  Takeshi Hoshida ,  Hisao Nakashima ,  Kazunari Shiota ,  Kiichi Sugitani

IPC分类号： H04B10/00 ,  H04B1/10 ,  H04B10/06

CPC分类号： H04B10/6971 ,  H04B10/25133 ,  H04B10/616 ,  H04B10/6161 ,  H04B2210/252

摘要： A distortion compensating apparatus which compensates for distortion in a waveform of a received light signal through a digital signal processing includes a plurality of fixed amount compensators which compensate for the distortion in the waveform at respective given compensating amounts. The combination of operating states of the plurality of fixed amount compensators is changed by on/off switching of each of the plurality of fixed amount compensators, and the plurality of fixed amount compensators are cascaded.

摘要翻译： 通过数字信号处理补偿接收的光信号的波形中的失真的失真补偿装置包括多个固定量补偿器，其补偿各个给定补偿量处的波形失真。 通过多个固定量补偿器中的每一个的开/关切换来改变多个固定量补偿器的操作状态的组合，并且多个固定量补偿器被级联。

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：US08249464B2

公开(公告)日：2012-08-21

申请号：US12719258

申请日：2010-03-08

申请人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura ,  Yuichi Akiyama

发明人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura ,  Yuichi Akiyama

IPC分类号： H04B10/00 ,  H04B10/06 ,  H04J14/02

CPC分类号： H04B10/614 ,  H04B10/60 ,  H04B10/63

摘要： In-phase signal light and quadrature-phase signal light obtained by mixing input light and local light with each other are converted into digital signals. The quality of a signal to be received is monitored with reference to information obtained through digital signal processing, and the power ratio between the input signal light and the local light that are to be mixed with each other are controlled on the basis of the result of the monitoring.

摘要翻译： 通过将输入光和局部光彼此混合而获得的同相信号光和正交相位信号光被转换为数字信号。 参照通过数字信号处理获得的信息来监视要接收的信号的质量，并且基于将要混合的输入信号光和本地光之间的功率比来控制 监控。

公开(公告)号：US20120141130A1

公开(公告)日：2012-06-07

申请号：US13267909

申请日：2011-10-07

申请人： Hisao Nakashima ,  Takeshi Hoshida

发明人： Hisao Nakashima ,  Takeshi Hoshida

IPC分类号： H04B10/04 ,  H04J14/02

CPC分类号： H04B10/505 ,  H04B10/572

摘要： The optical transmitter includes a light source; a signal processor; an optical modulator that modulates output light from the light source in accordance with a transmitting signal subjected to digital signal processing in the signal processor and outputs the modulated light as a light signal to a transmission path; and a control circuit that controls a carrier-wave frequency of the light signal output from the optical modulator, the signal processor including a mapping circuit that maps the transmitting signal to electric-field information according to a modulating scheme, and a phase rotating circuit that provides a phase rotation having a constant cycle to an electric-field phase of the electric-field information to which the mapping circuit maps the transmitting signal, the control circuit controlling the cycle of the phase rotation that the phase rotating circuit provides and thereby controlling the carrier-wave frequency of the light signal output from the optical modulator.

摘要翻译： 光发射机包括光源; 一个信号处理器; 光调制器，其根据在信号处理器中进行数字信号处理的发送信号调制来自光源的输出光，并将调制光作为光信号输出到传输路径; 以及控制电路，其控制从所述光调制器输出的光信号的载波频率，所述信号处理器包括映射电路，所述映射电路根据调制方案将所述发送信号映射到电场信息;以及相位旋转电路， 向映射电路映射发送信号的电场信息的电场相位提供恒定周期的相位旋转，控制电路控制相位旋转电路提供的相位旋转的周期，从而控制 从光调制器输出的光信号的载波频率。

公开(公告)号：US20100054759A1

公开(公告)日：2010-03-04

申请号：US12458104

申请日：2009-06-30

申请人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura

发明人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura

IPC分类号： H04B10/06

CPC分类号： H04L25/03038 ,  H04B10/6971 ,  H04L2025/03566

摘要： In a digital signal processing circuit of an optical receiver applicable to this method for electric power supply control, tap coefficients of a filter used in a waveform equalization section are calculated in a tap coefficient calculating section, based on a state of an optical fiber transmission line. Then, among the calculated tap coefficients, a tap coefficient for which an absolute value is less than a previously determined threshold is determined, and electric power supply to a circuit part of a filter corresponding to the tap coefficient is stopped. As a result, for an optical receiver that performs digital signal processing, it is possible to reduce the power consumption, while realizing waveform equalization at a high accuracy.

摘要翻译： 在适用于该电力供给控制方法的光接收机的数字信号处理电路中，根据光纤传输线的状态，在抽头系数计算部中计算波形均衡部中使用的滤波器的抽头系数 。 然后，在所计算的抽头系数中，确定绝对值小于先前确定的阈值的抽头系数，并且停止对与抽头系数相对应的滤波器的电路部分的电力供应。 结果，对于执行数字信号处理的光接收机，可以在高精度地实现波形均衡的同时降低功耗。

公开(公告)号：US20100002810A1

公开(公告)日：2010-01-07

申请号：US12495834

申请日：2009-07-01

申请人： Lei LI ,  Zhenning Tao ,  Hisao Nakashima

发明人： Lei LI ,  Zhenning Tao ,  Hisao Nakashima

IPC分类号： H04L27/227

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/6165 ,  H04B10/697

摘要： The invention provides an average length adaptive optimization method and apparatus. An adaptive optimization method for the average length used for phase recovery comprising: a residual phase difference calculation step, for receiving a current phase of a digital symbol obtained by phase recovery and a data modulation phase of the digital symbol obtained by data recovery, and calculating a residual phase difference of the digital symbol, which is a difference between the current phase and the data modulation phase of the digital symbol; a residual phase difference auto-correlation value calculation step, for calculating an auto-correlation value of the residual phase difference with displacement m, wherein −10≦m≦10, and m is an integral; an optimization step, for optimizing the average length based on the residual phase difference auto-correlation value.

摘要翻译： 本发明提供一种平均长度自适应优化方法和装置。 一种用于相位恢复的平均长度的自适应优化方法，包括：残差相位差计算步骤，用于接收通过相位恢复获得的数字符号的当前相位和通过数据恢复获得的数字符号的数据调制阶段，以及计算 数字符号的剩余相位差，其是数字符号的当前相位和数据调制相位之间的差; 剩余相位差自相关值计算步骤，用于计算残留相位差与位移m的自相关值，其中-10 <= m <= 10，m是积分; 优化步骤，根据残差相位自相关值优化平均长度。

公开(公告)号：US20090129787A1

公开(公告)日：2009-05-21

申请号：US12289072

申请日：2008-10-20

申请人： Lei Li ,  Zhenning Tao ,  Hisao Nakashima

发明人： Lei Li ,  Zhenning Tao ,  Hisao Nakashima

IPC分类号： H04B10/06

CPC分类号： H04B10/6164 ,  H04B10/61 ,  H04B10/613 ,  H04B10/6161 ,  H04B10/6162 ,  H04B10/6165 ,  H04B10/63

摘要： The present invention discloses an optical coherent receiver, and a frequency offset estimating apparatus and a frequency offset estimating method for use in the optical coherent receiver. The optical coherent receiver includes a front end processing section for changing an optical signal into a base band digital electric signal. The frequency offset estimating apparatus comprises a phase offset calculating section, for calculating a phase offset in said base band digital electric signal; a phase offset change calculating section, for calculating a change of said phase offset, namely a phase offset change, in accordance with the phase offset calculated by said phase offset calculating section; an ambiguity deciding section, for deciding whether there is ambiguity in said phase offset change calculated by said phase offset change calculating section, and outputting the phase offset change having no ambiguity; and a loop filtering section, for acquiring a weighted average of the phase offset change outputted by said ambiguity deciding section.

摘要翻译： 本发明公开了一种光学相干接收机，以及用于光学相干接收机中的频率偏移估计装置和频率偏移估计方法。 光相干接收机包括用于将光信号改变为基带数字电信号的前端处理部分。 所述频偏估计装置包括：相位偏移计算部，用于计算所述基带数字电信号中的相位偏移; 相位偏移改变计算部分，用于根据由所述相位偏移计算部分计算的相位偏移来计算所述相位偏移的变化，即相位偏移改变; 模糊判定部，用于判定由所述相位偏移变化计算部计算出的所述相位偏移变化是否存在歧义，并输出没有模糊性的相位偏移变化; 以及环路滤波部分，用于获取由所述模糊判定部分输出的相位偏移改变的加权平均值。