公开(公告)号：US08649689B2

公开(公告)日：2014-02-11

申请号：US12821061

申请日：2010-06-22

申请人： Nobukazu Koizumi ,  Takeshi Hoshida ,  Takahito Tanimura ,  Hisao Nakashima ,  Koji Nakamuta ,  Noriyasu Nakayama

发明人： Nobukazu Koizumi ,  Takeshi Hoshida ,  Takahito Tanimura ,  Hisao Nakashima ,  Koji Nakamuta ,  Noriyasu Nakayama

IPC分类号： H04B10/00

CPC分类号： H04B10/616 ,  H03J7/26 ,  H04B10/60 ,  H04B10/611 ,  H04B10/614 ,  H04B10/6165 ,  H04L7/0335 ,  H04L27/0014 ,  H04L27/223 ,  H04L27/2276 ,  H04L2027/0016 ,  H04L2027/0067

摘要： A digital coherent receiving apparatus includes a first oscillator for outputting a local light signal of a fixed frequency, a hybrid unit mixing the local light signal with a light signal received by a receiver, a second oscillator for outputting a sampling signal of a sampling frequency, a converter for converting the mixed light signal into digital signal synchronizing with the sampling signal, a waveform adjuster for adjusting a waveform distortion of the converted digital signal, a phase adjustor for adjusting a phase of the digital signal adjusted by the waveform adjustor, a demodulator for demodulating the digital signal adjusted by the phase adjuster, and a phase detector for detecting a phase of the digital signal adjusted by the phase adjuster, and a control signal output unit for outputting a frequency control signal on the basis of the detected phase signal to the second oscillator.

摘要翻译： 数字相干接收装置包括用于输出固定频率的本地光信号的第一振荡器，将本地光信号与由接收机接收的光信号混合的混合单元，用于输出采样频率的采样信号的第二振荡器， 用于将混合光信号转换为与采样信号同步的数字信号的转换器，用于调整转换的数字信号的波形失真的波形调节器，用于调整由波形调节器调节的数字信号的相位的相位调节器，解调器 用于解调由相位调节器调节的数字信号，以及相位检测器，用于检测由相位调节器调节的数字信号的相位;以及控制信号输出单元，用于根据检测到的相位信号将频率控制信号输出到 第二个振荡器。

公开(公告)号：US08594508B2

公开(公告)日：2013-11-26

申请号：US13137024

申请日：2011-07-15

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

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

IPC分类号： H04B10/00

CPC分类号： H04B10/2572 ,  H04B10/532 ,  H04B10/5561

摘要： An optical transmission system, where in an optical transmitter a detection bit having a specific pattern set according to the number of bits to be transmitted within one symbol time, is imparted with respect to a transmission signal in which transmission information has been encoded according to a preset format, and an optical signal generated by modulating light according to the transmission signal is transmitted to a transmission line. In an optical receiver, logic inversion or bit swap of received data is detected and compensated by using the detection bit included in the received signal, a decoding process of the compensated received signal is executed. As a result, when an optical signal capable of transmitting multi-bit information within one symbol time is transferred, it is possible to realize excellent transmission characteristics, by reliably compensating an error in received data caused by the modulation format or the multiplex system of the optical signal.

摘要翻译： 一种光传输系统，其中在光发射机中，根据在一个符号时间内要发送的比特数的数量，具有特定模式集的检测比特，根据发送信号已被编码的发送信号 预设格式和根据发送信号调制光产生的光信号被发送到传输线。 在光接收机中，通过使用包含在接收信号中的检测位来检测和补偿接收数据的逻辑反转或位交换，执行经补偿的接收信号的解码处理。 结果，当在一个符号时间内能够发送多位信息的光信号被传送时，通过可靠地补偿由调制格式或多路复用系统引起的接收数据中的错误，可以实现优异的传输特性 光信号。

公开(公告)号：US08526828B2

公开(公告)日：2013-09-03

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

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：US08515277B2

公开(公告)日：2013-08-20

申请号：US12910955

申请日：2010-10-25

申请人： Takahito Tanimura ,  Hisao Nakashima ,  Takeshi Hoshida

发明人： Takahito Tanimura ,  Hisao Nakashima ,  Takeshi Hoshida

IPC分类号： H04B10/08

CPC分类号： H04B10/07953

摘要： An apparatus includes a first estimator that estimates a signal quality based on an error correction number of an electrical signal obtained by photoelectrically converting a received optical signal; a second estimator that estimates a signal quality from which the influence of nonlinear effects is removed based on signals upstream and downstream of an identification calculator identifying the electrical signal; and a calculator that calculates the difference between the signal qualities estimated by the first and second estimators to calculate the amount of nonlinear effects.

摘要翻译： 一种装置包括：第一估计器，其基于通过光电转换接收的光信号获得的电信号的纠错数来估计信号质量; 基于识别电信号的识别计算机的上游和下游的信号，估计消除非线性效应的影响的信号质量的第二估计器; 以及计算器，其计算由第一和第二估计器估计的信号质量之间的差以计算非线性效应的量。

公开(公告)号：US08331805B2

公开(公告)日：2012-12-11

申请号：US12776514

申请日：2010-05-10

申请人： Hisao Nakashima ,  Takeshi Hoshida

发明人： Hisao Nakashima ,  Takeshi Hoshida

IPC分类号： H04B10/06

CPC分类号： H04B10/697 ,  H04B10/61 ,  H04B10/611 ,  H04B10/613 ,  H04B10/6165

摘要： A digital coherent optical receiver provided with a 90-degree optical hybrid circuit for detecting an in-phase signal and a quadrature signal of an input optical signal, includes first through fourth circuits. The first circuit calculates a square of a sum of the in-phase signal and the quadrature signal. The second circuit subtracts a squared value of the in-phase signal and a squared value of the quadrature signal from the calculation result of the first circuit. The third circuit detects a phase error of the 90-degree optical hybrid circuit based on the calculation result of the second circuit. The fourth circuit corrects at least one of the in-phase signal and the quadrature signal according to the phase error detected by the third circuit.

摘要翻译： 具有用于检测输入光信号的同相信号和正交信号的90度光混合电路的数字相干光接收机包括第一至第四电路。 第一电路计算同相信号和正交信号之和的平方。 第二电路从第一电路的计算结果中减去同相信号的平方值和正交信号的平方值。 第三电路基于第二电路的计算结果来检测90度光混合电路的相位误差。 第四电路根据由第三电路检测到的相位误差校正至少一个同相信号和正交信号。

公开(公告)号：US20120170928A1

公开(公告)日：2012-07-05

申请号：US11939646

申请日：2007-11-14

申请人： Toshiki TANAKA ,  Hisao Nakashima ,  Takeshi Hoshida ,  Toru Katagiri ,  Hiroki Ooi ,  Akira Miura

发明人： Toshiki TANAKA ,  Hisao Nakashima ,  Takeshi Hoshida ,  Toru Katagiri ,  Hiroki Ooi ,  Akira Miura

IPC分类号： H04J14/02 ,  H04B10/08

CPC分类号： H04J14/0286 ,  H04B10/2557 ,  H04B10/516 ,  H04J14/0204 ,  H04J14/0212 ,  H04J14/0217 ,  H04J14/0219 ,  H04J14/022 ,  H04J14/0221 ,  H04J14/0227 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0283

摘要： An optical transmitter is provided for transmitting a wavelength multiplexed signal comprising an intensity modulation optical signal and a phase modulation optical signal through a transmission line. The optical transmitter includes a bit time difference given signal generator for generating at least two optical signals having a bit time difference therebetween, from the wavelength multiplexed signal. The optical transmitter further includes a wavelength multiplexed signal output unit to which at least two optical signals are input from the bit time difference given signal generator, and which generates and outputs a wavelength multiplexed signal in which the bit time difference was given between the phase modulation optical signal and the phase modulation optical signal.

摘要翻译： 提供了一种用于通过传输线传输包括强度调制光信号和相位调制光信号的波分复用信号的光发射机。 所述光发射机包括位时间差给定信号发生器，用于从所述波长复用信号产生具有位时间差的至少两个光信号。 光发射机还包括波长多路复用信号输出单元，从比特时间差给定信号发生器输入至少两个光信号，并且生成并输出在相位调制之间给出比特时间差的波长多路复用信号 光信号和强度调制光信号。

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：US08116635B2

公开(公告)日：2012-02-14

申请号：US12155262

申请日：2008-05-30

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

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

IPC分类号： H04B10/08

CPC分类号： H04J14/06 ,  H04B10/505 ,  H04B10/532 ,  H04B10/541 ,  H04B10/548 ,  H04B10/5561 ,  H04J14/08 ,  H04L5/04

摘要： A polarization multiplexing and transmitting apparatus generates polarization multiplexed light by multiplexing modulated signal components that having varying intensities and are in polarization states orthogonal to each other. The polarization multiplexing and transmitting apparatus includes a converting unit that converts light generated by a light source into signal components having a varying intensity synchronized with a clock signal input thereto and a varying intensity inversely synchronized with the clock signal, respectively; a modulating unit that modulates the signal components, respectively; and a polarization adjusting unit that orthogonalizes polarization states of the signal components.

摘要翻译： 偏振复用和发送装置通过对具有变化的强度并且处于彼此正交的偏振状态的调制信号分量进行多路复用来产生偏振复用光。 偏振复用和发送装置包括转换单元，其将由光源产生的光变换成具有与输入的时钟信号同步的变化强度的信号分量和与时钟信号反向同步的变化强度; 调制单元，分别调制信号分量; 以及使信号分量的偏振态正交化的偏振调整单元。

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：US20100329697A1

公开(公告)日：2010-12-30

申请号：US12821061

申请日：2010-06-22

申请人： Nobukazu KOIZUMI ,  Takeshi Hoshida ,  Takahito Tanimura ,  Hisao Nakashima ,  Koji Nakamuta ,  Noriyasu Nakayama

发明人： Nobukazu KOIZUMI ,  Takeshi Hoshida ,  Takahito Tanimura ,  Hisao Nakashima ,  Koji Nakamuta ,  Noriyasu Nakayama

IPC分类号： H04B10/06

CPC分类号： H04B10/616 ,  H03J7/26 ,  H04B10/60 ,  H04B10/611 ,  H04B10/614 ,  H04B10/6165 ,  H04L7/0335 ,  H04L27/0014 ,  H04L27/223 ,  H04L27/2276 ,  H04L2027/0016 ,  H04L2027/0067

摘要： A digital coherent receiving apparatus includes a first oscillator for outputting a local light signal of a fixed frequency, a hybrid unit mixing the local light signal with a light signal received by a receiver, a second oscillator for outputting a sampling signal of a sampling frequency, a converter for converting the mixed light signal into digital signal synchronizing with the sampling signal, a waveform adjuster for adjusting a waveform distortion of the converted digital signal, a phase adjustor for adjusting a phase of the digital signal adjusted by the waveform adjustor, a demodulator for demodulating the digital signal adjusted by the phase adjuster, and a phase detector for detecting a phase of the digital signal adjusted by the phase adjuster, and a control signal output unit for outputting a frequency control signal on the basis of the detected phase signal to the second oscillator.

摘要翻译： 数字相干接收装置包括用于输出固定频率的本地光信号的第一振荡器，将本地光信号与由接收机接收的光信号混合的混合单元，用于输出采样频率的采样信号的第二振荡器， 用于将混合光信号转换为与采样信号同步的数字信号的转换器，用于调整转换的数字信号的波形失真的波形调节器，用于调整由波形调节器调节的数字信号的相位的相位调节器，解调器 用于解调由相位调节器调节的数字信号，以及相位检测器，用于检测由相位调节器调节的数字信号的相位;以及控制信号输出单元，用于根据检测到的相位信号将频率控制信号输出到 第二个振荡器。