公开(公告)号：EP2922221B1

公开(公告)日：2018-08-29

申请号：EP15275076.6

申请日：2015-03-18

申请人： ZTE Corporation

发明人： Jia, Zhensheng ,  Chien, Hung-Chang ,  Yu, Jianjun

IPC分类号： H04J14/06 ,  H04L1/00 ,  H04B10/61

CPC分类号： H04J14/06 ,  H04B10/612 ,  H04B10/613 ,  H04B10/6165 ,  H04B10/6166 ,  H04L1/0036 ,  H04L1/0054

摘要： A blind equalization technique of high-order QAM signals is provided. A method implemented at a receiver-side in an optical communication network receives an optical signal and performs a two-step polarization tracking process on the received optical signal. Using another method, a polarization multiplexed optical transmission is received by a receiver and a polarization tracking process is performed by applying two different algorithms in parallel. One algorithm may be a decision directed least means square (DD-LMS) algorithm. Another algorithm may be a constant modulus algorithm (CMA).

公开(公告)号：EP3021501A4

公开(公告)日：2017-03-08

申请号：EP14823778

申请日：2014-05-26

申请人： NEC CORP

发明人： HARA YASUSHI

IPC分类号： H04B10/61 ,  H04B10/2507 ,  H04B10/556 ,  H04L27/22

CPC分类号： H04B10/2507 ,  H04B10/5561 ,  H04B10/612 ,  H04B10/614 ,  H04B10/616 ,  H04B10/6161 ,  H04L27/2096 ,  H04L27/3809

摘要： Present invention provides an optical communication system that controls reception sensitivity of an optical receiver. The communication system(100) according to the present invention comprising: an optical transmitter(1) to which an transmission signal is input, and which modulates the transmission signal to an optical signal and transmits the optical signal; and an optical receiver(2) that receives the optical signal and demodulates the optical signal to an transmission signal. And the optical receiver(2) includes a photoelectric conversion means(10) for converting the optical signal into an analog electric signal, a conversion and demodulation means(25) for converting the analog electric signal into a digital signal and demodulating the signal to the transmission signal, and an amplitude control means(102) for controlling amplitude of the analog electric signal, and the amplitude control means(102) controls the amplitude of the analog electric signal in accordance with wavelength dispersion of the optical signal.

摘要翻译： 本发明提供一种控制光接收机的接收灵敏度的光通信系统。 根据本发明的通信系统（100）包括：光发射机（1），传输信号被输入到其中，并将传输信号调制到光信号并传输光信号; 以及接收光信号并将光信号解调为传输信号的光接收器（2）。 光接收器（2）包括用于将光信号转换为模拟电信号的光电转换装置（10），用于将模拟电信号转换为数字信号并将信号解调为信号的转换和解调装置（25） 发送信号以及用于控制模拟电信号的振幅的振幅控制装置（102），振幅控制装置（102）根据光信号的波长色散来控制模拟电信号的振幅。

公开(公告)号：EP2961120A4

公开(公告)日：2016-10-19

申请号：EP14754299

申请日：2014-02-20

申请人： MITSUBISHI ELECTRIC CORP

发明人： KONISHI YOSHIAKI ,  KUBO KAZUO

IPC分类号： H04L27/34 ,  H04B10/25 ,  H04B10/40 ,  H04B10/516 ,  H04B10/61 ,  H04J3/00 ,  H04J3/16 ,  H04J14/06 ,  H04L1/00 ,  H04L27/36

CPC分类号： H04B10/40 ,  H04B10/25 ,  H04B10/5161 ,  H04B10/5561 ,  H04B10/612 ,  H04J3/1652 ,  H04J14/06 ,  H04J2203/006 ,  H04J2203/0089 ,  H04L1/0042 ,  H04L27/34 ,  H04L27/362

摘要： Provided is an optical transmission device for transmitting and receiving a multilevel-modulated optical signal, including: a plurality of transmission frame processors (212 to 214, 222 to 224) for generating transmission frame signals accommodating a plurality of client signals that are each subjected to error correction processing and scrambling/descrambling processing; and a digital modulator/demodulator (215) for mapping the transmission frame signals that are input to and output from the plurality of transmission frame processors to a multilevel signal and performing digital modulation/demodulation, in which the plurality of transmission frame processors each have a function of shifting a phase of a pattern between a plurality of transmission frames to be mapped to a multilevel signal and be digitally modulated/demodulated.

公开(公告)号：EP2592767A1

公开(公告)日：2013-05-15

申请号：EP10854444.6

申请日：2010-07-09

申请人： Hitachi, Ltd.

发明人： KIKUCHI, Nobuhiko

IPC分类号： H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/142 ,  H04B10/152 ,  H04B10/26 ,  H04B10/28 ,  H04L27/01

CPC分类号： H04B10/00 ,  H04B10/60 ,  H04B10/612 ,  H04B10/677 ,  H04B10/697

摘要： An optical receiver 300 uses two optical delay detectors 223 (which have been set such that the delay times T are equal to symbol time and the phase differences are zero and 90 degrees) to receive an optical multilevel signal 215 and the output signals are A/D converted, thereafter subjected to retiming processes, and then subjected to a differential phase detection, thereby detecting a differential phase at a symbol center time point. In the receiver, the detected differential phase is integrated for each symbol and thereafter combined with an amplitude component obtained from a separately disposed optical intensity receiver, thereby reproducing an optical electric field. Thereafter, a wavelength dispersion compensation circuit (231) of a time period T is used to compensate for the wavelength dispersion of the transmission path. Moreover, an electric or optical Nyquist filter may be inserted to perform a band limitation, thereby enhancing the wavelength dispersion compensation effect.

摘要翻译： 光接收器300使用两个光延迟检测器223（其被设置为使得延迟时间T等于符号时间并且相位差为零和90度）以接收光学多电平信号215，并且输出信号为A / D转换，然后进行重新定时处理，然后进行差分相位检测，从而在符号中心时间点检测差分相位。 在接收机中，检测到的差分相位针对每个符号进行积分，然后与从单独配置的光强度接收器获得的振幅分量相结合，从而再现光电场。 此后，使用时间段T的波长色散补偿电路（231）来补偿传输路径的波长色散。 此外，可以插入电或光奈奎斯特滤波器以执行频带限制，从而增强波长色散补偿效果。

公开(公告)号：EP3202056A4

公开(公告)日：2018-07-04

申请号：EP15845902

申请日：2015-10-01

申请人： B G NEGEV TECHNOLOGIES & APPLICATIONS LTD AT BEN GURION UNIV ,  UNIV BAR ILAN

发明人： SADOT DAN ,  ZALEVSKY ZEEV ,  YEMINY TOMER

IPC分类号： H04B10/00 ,  H04B10/291

CPC分类号： H04B10/615 ,  H04B10/291 ,  H04B10/5161 ,  H04B10/54 ,  H04B10/541 ,  H04B10/548 ,  H04B10/5561 ,  H04B10/612 ,  H04B2210/516 ,  H04L25/03165

摘要： A method for performing optical constellation conversion, according to which each received symbol from a constellation of input symbols is optically split into M components and each component is multiplied by a first predetermined different complex weighing factor, to achieve M firstly weighted components with different amplitudes. Then a nonlinear processor optically performs a nonlinear transform on each M firstly weighted components, so as to obtain M outputs which are linearly independent, Finally, a linear processor optically performs a linear transform to obtain a new converted constellation by optically multiplying, in the complex plane, each of the M outputs by a second predetermined different complex weighing factor, to achieve M secondly weighted components and then summing the M secondly weighted components.

公开(公告)号：EP3207676A1

公开(公告)日：2017-08-23

申请号：EP15787366.2

申请日：2015-10-14

申请人： Alcatel Lucent

发明人： XIE, Chongjin

IPC分类号： H04L27/34 ,  H04B10/61

CPC分类号： H04B10/616 ,  H04B10/5167 ,  H04B10/61 ,  H04B10/612 ,  H04J14/04 ,  H04L27/34

摘要： A method comprising, receiving digital- electrical input symbols of a stream of input symbols, the input symbols corresponding to signal points of a symbol constellation. The method also comprises classifying the input symbols, wherein a first symbol class comprises input symbols corresponding to signal points that are variant to rotation of the symbol constellation, and, a second symbol class comprises input symbols corresponding to signal points that are invariant to rotation of the symbol constellation. The method also comprises applying selective differential coding only to those input symbols of the first symbol class.

摘要翻译： 一种方法，包括：接收输入符号流的数字电输入符号，所述输入符号对应于符号星座的信号点。 该方法还包括对输入符号进行分类，其中第一符号类别包括对应于与符号星座图的旋转不同的信号点的输入符号，并且第二符号类别包括对应于信号点的输入符号， 符号星座。 该方法还包括仅将选择性差分编码应用于第一符号类的那些输入符号。

公开(公告)号：EP3048746A4

公开(公告)日：2016-10-19

申请号：EP14797641

申请日：2014-05-23

申请人： ZTE CORP ,  ZTE MICROELECTRONICS TECHNOLOGY CO LTD

发明人： YAO YANGZHONG ,  LI QIANG ,  LI YUNPENG ,  GU GUOHUA ,  REN WEI

IPC分类号： H04B10/079 ,  H04B10/61

CPC分类号： H04B10/07951 ,  H04B10/612 ,  H04B10/613 ,  H04B10/6161 ,  H04B10/6163 ,  H04B10/6165 ,  H04B10/6166

摘要： Disclosed are a chromatic dispersion estimation method and device in optical coherent communication, wherein, the method includes: performing a fast Fourier transform on IQ-imbalance compensated data to obtain frequency-domain data in two polarization directions; calculating autocorrelation sequences of the frequency-domain data and performing an inverse fast Fourier transform on the values of the autocorrelation sequences; calculating modulus squares of the results of the inverse fast Fourier transform, and adding the results in the two polarization directions to obtain P [n]; determining a mean value P [n] of P [n]s of a plurality of data sets; calculating an index n 0 of the maximum value of P [n], and estimating a dispersion value of the optical fiber link according to the index n 0 of the maximum value of P [n]. The abovementioned technical solution allows a significantly accurate and rapid estimation of dispersion values.

摘要翻译： 本发明公开了在光相干通信，worin色散估计方法和装置，该方法包括：对IQ失衡快速傅立叶变换补偿的数据在两个偏振方向，以获得频域数据; 计算频域数据的自相关序列和执行逆快速傅立叶变换的自相关序列的值变换; 计算模数平方快速傅立叶逆的结果的变换，而在两个偏振方向将所述结果以获得P [N]; 确定平均值P的数据集的多个P [n]的S [N]; 指数P [N]的最大值的N 0，以及估计所述光纤链路gemäß的分散值的索引P [N]的最大值的n个0的计算。 上述技术方案允许色散值的显着准确和快速估计。

公开(公告)号：EP2406901A4

公开(公告)日：2015-04-01

申请号：EP10751237

申请日：2010-03-08

申请人： TYCO ELECTRONICS SUBSEA COMM

发明人： CAI YI

IPC分类号： H04B10/61 ,  H04L27/22

CPC分类号： H04B10/61 ,  H04B10/611 ,  H04B10/612 ,  H04B10/614 ,  H04B10/6162 ,  H04B10/6164 ,  H04B10/6165 ,  H04L27/223

公开(公告)号：EP2406901A1

公开(公告)日：2012-01-18

申请号：EP10751237.8

申请日：2010-03-08

申请人： TYCO ELECTRONICS SUBSEA COMMUNICATIONS LLC

发明人： CAI, Yi

IPC分类号： H04B10/06

CPC分类号： H04B10/61 ,  H04B10/611 ,  H04B10/612 ,  H04B10/614 ,  H04B10/6162 ,  H04B10/6164 ,  H04B10/6165 ,  H04L27/223

摘要： A system and method implementing dual stage carrier frequency offset compensation (FOC) in a coherent receiver for an optical communication system. In the first stage, a feed forward FOC function compensates for relatively slowly drifting frequency offsets. In a second stage, a decision-feedback FOC function compensates for relatively quickly drifting frequency offsets. The feed forward frequency offset compensation may be implemented with a feed forward carrier phase estimation function and the decision-feedback frequency offset compensation may be implemented with a decision-feedback carrier phase estimation function.

摘要翻译： 一种在光纤通信系统的相干接收机中实现双级载波相位估计（CPE）的系统和方法。 在第一阶段，实施前馈CPE以进行训练序列的初始载波相位估计。 初始载波相位估计耦合到实现判决反馈CPE的第二级。 在训练期后，可以使用决策反馈CPE来实现系统流量的精确位决策。

公开(公告)号：EP1256193A1

公开(公告)日：2002-11-13

申请号：EP01946995.6

申请日：2001-01-11

申请人： Lockheed Martin Corporation

发明人： SPICKERMANN Ralph , 

IPC分类号： H04B10/02 ,  H04B10/04 ,  H04B10/16

CPC分类号： H04B10/2563 ,  H04B10/2513 ,  H04B10/612

摘要： A wavelength division multiplexed (23) fiber optic link (40) including a phase shift keyed coherent transmitter (20) and receiver (30) coupled together by a way of periodic optically amplified (42, 44) fiber link. The transmitter has a plurality of phase shift keyed modulators (22) that each receive data for transmission over the fiber link. A separate laser (21) is coupled to each of the modulators (22) whose respective output beams are modulated with the data for transmission. Outputs of the modulators are input to a wavelength division multiplexer (23) that multiplexes the phase shift keyed modulated outputs of the phase shift keyed modulators for transmission over the fiber link. The receiver (30) includes an optical power splitter (31) or wavelength division multiplexed demultiplexer (32) that produces a plurality of data channels. A coherent optical demodulator (33) demodulates the plurality of data channels to produce data for each data channel. A corresponding optical signaling method is also disclosed.