公开(公告)号：US08761613B2

公开(公告)日：2014-06-24

申请号：US12897331

申请日：2010-10-04

申请人： Liang Dou ,  Zhenning Tao

发明人： Liang Dou ,  Zhenning Tao

IPC分类号： H04B10/50

CPC分类号： H04B10/50575 ,  H04B10/50595

摘要： This invention relates to external modulator monitoring device and method for monitoring an external modulator. The external modulator monitoring device includes a mixing unit for mixing optical signals modulated by the external modulator and optical signals not modulated by the external modulator, so as to obtain multiple branches of mixed optical signals; an electrical differential unit for converting the multiple branches of mixed optical signals into corresponding multiple branches of electrical signals, and performing a differential processing on voltages of the multiple branches of electrical signals to obtain differential signals; and a power detection unit for detecting power of the differential signals.

摘要翻译： 本发明涉及用于监视外部调制器的外部调制器监视装置和方法。 外部调制器监视装置包括用于混合由外部调制器调制的光信号和未被外部调制器调制的光信号的混合单元，以获得混合光信号的多个分支; 用于将混合光信号的多个分支转换成相应的多个电信号的电差分单元，并且对电信号的多个分支的电压进行差分处理以获得差分信号; 以及功率检测单元，用于检测差分信号的功率。

公开(公告)号：US08750443B2

公开(公告)日：2014-06-10

申请号：US12292530

申请日：2008-11-20

申请人： Zhenning Tao ,  Lei Li ,  Hisao Nakashima

发明人： Zhenning Tao ,  Lei Li ,  Hisao Nakashima

IPC分类号： H04L7/00

CPC分类号： H04B10/69 ,  H04L27/0002 ,  H04L27/2273 ,  H04L2027/003

摘要： The present invention relates to a phase error estimator, a coherent receiver and a phase error estimating method. The phase error estimator estimates a phase error in an inputted base band electric signal and feeds back said phase error; said phase error estimator comprises: a pre-decider, for judging a phase of data in said base band electric signal in accordance with said feedback phase error; a phase error complex value extracting section, for extracting a real part and an imaginary part of the phase error in accordance with the judgment result of said pre-decider; a phase error determining section, for determining said phase error in accordance with the real part and the imaginary part of the phase error extracted by the phase error complex value extracting section; and a time delay feeding back section, for delaying said phase error by N number of symbols and feeding back the delayed phase error to said pre-decider, wherein N is an integer greater than 1.

摘要翻译： 本发明涉及相位误差估计器，相干接收机和相位误差估计方法。 相位误差估计器估计输入基带电信号中的相位误差并反馈所述相位误差; 所述相位误差估计器包括：预判定器，用于根据所述反馈相位误差来判断所述基带电信号中的数据相位; 相位误差复数值提取部分，用于根据所述预选择器的判断结果提取相位误差的实部和虚部; 相位误差确定部分，用于根据由相位误差复数值提取部分提取的相位误差的实部和虚部来确定所述相位误差; 以及时间延迟反馈部分，用于将所述相位误差延迟N个符号并将所述延迟相位误差反馈到所述预决定器，其中N是大于1的整数。

公开(公告)号：US08532502B2

公开(公告)日：2013-09-10

申请号：US12479363

申请日：2009-06-05

申请人： Huijian Zhang ,  Zhenning Tao ,  Takahito Tanimura

发明人： Huijian Zhang ,  Zhenning Tao ,  Takahito Tanimura

IPC分类号： H04B10/06

CPC分类号： H04B10/6166 ,  H04B10/61 ,  H04B10/611 ,  H04B10/614 ,  H04J14/06

摘要： In present invention, a filter coefficient adjustment apparatus is used in a polarization demultiplexer which demultiplexes the input signals by using filters to obtain demultiplexed output signals, said filter coefficient adjustment apparatus being used for adjusting the coefficients of the filters, wherein said filter coefficient adjustment apparatus comprises: an logarithm partial derivative calculation unit for calculating the logarithm partial derivative value of a target probability density function of the demultiplexed output signals when its self-variable value is the present demultiplexed output signal value; a gradient calculation unit for calculating the gradient of a target optimizing function for optimizing the distribution of the multiplexed output signals based on the logarithm partial derivative value calculated by the logarithm partial derivative calculation unit; and a filter coefficient updating unit for updating the coefficients of the filters based on the gradient calculated by the gradient calculation unit.

摘要翻译： 在本发明中，滤波器系数调整装置用于通过使用滤波器对输入信号进行解复用以获得解复用输出信号的偏振解复用器，所述滤波器系数调整装置用于调整滤波器的系数，其中所述滤波器系数调整装置 包括：对数偏导数计算单元，用于当其自变量值为当前解复用的输出信号值时，计算解复用输出信号的目标概率密度函数的对数偏导数值; 梯度计算单元，用于基于由对数偏导数计算单元计算的对数偏导数值来计算用于优化多路复用输出信号的分布的目标优化函数的梯度; 以及滤波器系数更新单元，用于基于由梯度计算单元计算的梯度来更新滤波器的系数。

公开(公告)号：US08331496B2

公开(公告)日：2012-12-11

申请号：US12896476

申请日：2010-10-01

申请人： Meng Yan ,  Zhenning Tao ,  Shoichiro Oda

发明人： Meng Yan ,  Zhenning Tao ,  Shoichiro Oda

IPC分类号： H04L27/00

CPC分类号： H04L27/3827 ,  H04L2027/0046 ,  H04L2027/0067

摘要： The present invention relates to a phase recovery device, phase recovery method and receiver for 16 QAM data modulation. The phase recovery device comprises: a fourth power calculator for calculating fourth power values of respective symbols in a symbol block; a classification unit for classifying respective symbols in the symbol block based on amplitudes, so as to classify respective symbols in the symbol block into a first category having a large or small amplitude, and a second category having an intermediate amplitude; a reference point determination unit for determining a reference point based on categories of respective symbols in the symbol block and their fourth power values; a rotation unit for rotating respective symbols in the symbol block undergone the fourth power operations and being classified into the second category, based on the reference point; and a phase estimation unit for performing phase estimations based on respective symbols in the symbol block undergone the fourth power operations and being classified into the first category, and respective rotated symbols in the symbol block undergone the fourth power operations and being classified into the second category.

摘要翻译： 本发明涉及用于16QAM数据调制的相位恢复装置，相位恢复方法和接收机。 相位恢复装置包括：第四功率计算器，用于计算符号块中各符号的第四功率值; 分类单元，用于基于幅度对符号块中的各个符号进行分类，以将符号块中的各个符号分类为具有大或小幅度的第一类别和具有中间幅度的第二类别; 参考点确定单元，用于基于符号块中的各个符号的类别及其第四功率值来确定参考点; 旋转单元，用于旋转经过第四功率操作的符号块中的各个符号，并且基于参考点将其分类为第二类别; 以及相位估计单元，用于基于经过第四功率操作的符号块中的各个符号执行相位估计，并将其分类为第一类别，以及经过第四功率操作的符号块中的各个旋转符号，并被分类为第二类别 。

公开(公告)号：US08189718B2

公开(公告)日：2012-05-29

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： H04L27/00

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＆lt; nlE; m＆nlE; 10和m是整数; 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：US08078066B2

公开(公告)日：2011-12-13

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。

公开(公告)号：US07877025B2

公开(公告)日：2011-01-25

申请号：US11994649

申请日：2006-07-07

申请人： Zhenning Tao ,  Jens C. Rasmussen ,  Akihiko Isomura

发明人： Zhenning Tao ,  Jens C. Rasmussen ,  Akihiko Isomura

IPC分类号： H04B10/06 ,  H04B10/04

CPC分类号： H04B10/69 ,  H04B10/677

摘要： I branch is provided with a first interferometer, a first balanced optical detector, and a first data recovery circuit. Q branch is provided with a second interferometer, a second balanced optical detector and a second data recovery circuit. In I branch, a mixer multiples input signal of the first data recovery circuit with output signal of the second recovery circuit. An averaging circuit averages output signal of the mixer. In Q branch, a mixer multiples input signal of the second data recovery circuit with output signal of the first recovery circuit. An averaging circuit averages output signal of the mixer. A first phase control apparatus controls the phase of a phase shifter comprised in the first interferometer based on the output signal of the averaging circuit. A second phase control apparatus, in the same manner, controls the phase of a phase shifter comprised in the second interferometer.

摘要翻译： I分支设置有第一干涉仪，第一平衡光学检测器和第一数据恢复电路。 Q分支设置有第二干涉仪，第二平衡光学检测器和第二数据恢复电路。 在I分支中，混频器将第一数据恢复电路的输入信号与第二恢复电路的输出信号相乘。 平均电路对混频器的输出信号进行平均。 在Q分支中，混频器将第二数据恢复电路的输入信号与第一恢复电路的输出信号相乘。 平均电路对混频器的输出信号进行平均。 第一相位控制装置基于平均电路的输出信号来控制包括在第一干涉仪中的移相器的相位。 以相同的方式，第二相位控制装置控制包括在第二干涉仪中的移相器的相位。

公开(公告)号：US20100003028A1

公开(公告)日：2010-01-07

申请号：US12479363

申请日：2009-06-05

申请人： Huijian ZHANG ,  Zhenning Tao ,  Takahito Tanimura

发明人： Huijian ZHANG ,  Zhenning Tao ,  Takahito Tanimura

IPC分类号： H04J14/06

CPC分类号： H04B10/6166 ,  H04B10/61 ,  H04B10/611 ,  H04B10/614 ,  H04J14/06

摘要： In present invention, a filter coefficient adjustment apparatus is used in a polarization demultiplexer which demultiplexes the input signals by using filters to obtain demultiplexed output signals, said filter coefficient adjustment apparatus being used for adjusting the coefficients of the filters, wherein said filter coefficient adjustment apparatus comprises: an logarithm partial derivative calculation unit for calculating the logarithm partial derivative value of a target probability density function of the demultiplexed output signals when its self-variable value is the present demultiplexed output signal value; a gradient calculation unit for calculating the gradient of a target optimizing function for optimizing the distribution of the multiplexed output signals based on the logarithm partial derivative value calculated by the logarithm partial derivative calculation unit; and a filter coefficient updating unit for updating the coefficients of the filters based on the gradient calculated by the gradient calculation unit.

摘要翻译： 在本发明中，滤波器系数调整装置用于通过使用滤波器对输入信号进行解复用以获得解复用输出信号的偏振解复用器，所述滤波器系数调整装置用于调整滤波器的系数，其中所述滤波器系数调整装置 包括：对数偏导数计算单元，用于当其自变量值为当前解复用的输出信号值时，计算解复用输出信号的目标概率密度函数的对数偏导数值; 梯度计算单元，用于基于由对数偏导数计算单元计算的对数偏导数值来计算用于优化多路复用输出信号的分布的目标优化函数的梯度; 以及滤波器系数更新单元，用于基于由梯度计算单元计算的梯度来更新滤波器的系数。

公开(公告)号：US08886056B2

公开(公告)日：2014-11-11

申请号：US13221312

申请日：2011-08-30

申请人： Lei Li ,  Zhenning Tao ,  Takeshi Hoshida

发明人： Lei Li ,  Zhenning Tao ,  Takeshi Hoshida

IPC分类号： H04B10/00 ,  H04B10/255 ,  H04B10/61 ,  H04B10/079

CPC分类号： H04B10/0795 ,  H04B10/255 ,  H04B10/6163

摘要： The present invention provides apparatus for self-phase modulation noise calculation, apparatus for self-phase modulation noise elimination and optical coherent receiver. The apparatus for calculation comprises: a signal receiver to receive an input signal; a calculator connected to the signal receiver to calculate a self-phase modulation noise at the current instant by using the signal powers of an input signal waveform at the current instant and at several sampling instants adjacent to the current instant. The embodiments of the present invention calculates the self-phase modulation noise at a certain instant by using the signal powers at a plurality of digital sampling periods before and after this instant, and when the apparatus is used to calculate the self-phase modulation noise of each of the sub-spans in an optical fiber transmission link, in case that the calculation precision is ensured, the granularity of the sub-spans may be reduced, thereby lowering the complexity of the calculation.

摘要翻译： 本发明提供了用于自相位调制噪声计算的装置，用于自相位调制噪声消除的装置和光学相干接收机。 该计算装置包括：接收输入信号的信号接收器; 连接到信号接收器的计算器，通过使用当前时刻的输入信号波形的信号功率和与当前时刻相邻的几个采样时刻来计算当前时刻的自相位调制噪声。 本发明的实施例通过在该时刻之前和之后的多个数字采样周期中使用信号功率来计算某一时刻的自相位调制噪声，并且当该装置用于计算自相位调制噪声的自相位调制噪声 在光纤传输链路中的每个子跨度，在确保计算精度的情况下，可能减小子跨度的粒度，从而降低计算的复杂度。

公开(公告)号：US08762086B2

公开(公告)日：2014-06-24

申请号：US12232179

申请日：2008-09-11

申请人： Zhenning Tao ,  Jun Tian ,  Huijian Zhang ,  Hisao Nakashima

发明人： Zhenning Tao ,  Jun Tian ,  Huijian Zhang ,  Hisao Nakashima

IPC分类号： G01R13/00

CPC分类号： H04L27/3863 ,  H04L27/3872

摘要： The present invention discloses a phase imbalance monitoring apparatus, an amplitude imbalance monitoring apparatus, as well as an apparatus incorporating the same. The phase imbalance monitoring apparatus is for use in an apparatus in which imbalance between an I branch signal and a Q branch signal in quadrature to each other is required to be monitored, and is characterized in comprising a preprocessing unit, for performing preprocessing on the I branch signal and the Q branch signal to extract essential information relevant to correlation of the signals; and a correlation unit, for performing correlation processing on the extracted essential information to learn of the phase imbalance between the I branch signal and the Q branch signal.

摘要翻译： 本发明公开了一种相位不平衡监视装置，振幅不平衡监视装置，以及包括该不平衡监视装置的装置。 相位不平衡监视装置用于需要监视I分支信号和彼此正交的Q分支信号之间的不平衡的装置，其特征在于包括预处理单元，用于对I进行预处理 分支信号和Q分支信号，以提取与信号相关性相关的基本信息; 以及相关单元，用于对所提取的基本信息执行相关处理，以了解I分支信号和Q分支信号之间的相位不平衡。