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    Digital coherent receiver and receiving method
    3.
    发明授权
    Digital coherent receiver and receiving method 有权
    数字相干接收机和接收方式

    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 。

    OPTICAL TRANSMITTER AND OPTICAL TRANSMITTER UNIT
    6.
    发明申请
    OPTICAL TRANSMITTER AND OPTICAL TRANSMITTER UNIT 有权
    光学发射器和光学发射器单元

    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。

    Method for Electric Power Supply of Optical Receiver, Digital Signal Processing Circuit, and Optical Receiver
    7.
    发明申请
    Method for Electric Power Supply of Optical Receiver, Digital Signal Processing Circuit, and Optical Receiver 有权
    光接收机，数字信号处理电路和光接收机的供电方法

    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。

    ADAPTIVE OPTIMIZATION METHOD AND APPARATUS FOR AVERAGE LENGTH
    8.
    发明申请
    ADAPTIVE OPTIMIZATION METHOD AND APPARATUS FOR AVERAGE LENGTH 有权
    自适应优化方法和平均长度的设备

    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。

    Optical coherent receiver, frequency offset estimating apparatus and method for optical coherent receiver
    9.
    发明申请
    Optical coherent receiver, frequency offset estimating apparatus and method for optical coherent receiver 有权
    光学相干接收机，用于光学相干接收机的频偏估计装置和方法

    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。

    Network designing device and computer-readable medium
    10.
    发明授权
    Network designing device and computer-readable medium 有权
    网络设计设备和计算机可读介质

    公开(公告)号：US07505414B2

    公开(公告)日：2009-03-17

    申请号：US10992829

    申请日：2004-11-22

    申请人： Hisao Nakashima ,  Takeshi Hoshida ,  Yuichi Akiyama ,  Takafumi Terahara

    发明人： Hisao Nakashima ,  Takeshi Hoshida ,  Yuichi Akiyama ,  Takafumi Terahara

    IPC分类号： H04L12/28

    CPC分类号： H04L41/145

    摘要： Linear networks are divided into a plurality of regeneration repeating sections which have nodes having regeneration repeaters arranged therein at both ends, devices such as linear repeaters or OADMs are arranged at the nodes positioned in the regeneration repeating sections, a plurality of assumed paths assumed as a result of arranging the devices are extracted in the regeneration repeating sections, and transmission permission/inhibition is determined transmission permission/inhibition is displayed to allow a user to perform settings again.

    摘要翻译： 线性网络被分成多个再生重复部分，其具有在其两端布置有再生中继器的节点，诸如线性中继器或OADM的设备被布置在位于再生重复部分中的节点处，多个假定路径被假定为 在再生重复部分中抽出装置的结果，对每个假设路径确定发送允许/禁止，然后显示所确定的发送允许/禁止以允许用户再次执行设置。