公开(公告)号：US20040105682A1

公开(公告)日：2004-06-03

申请号：US10307466

申请日：2002-12-02

Applicant: Nortel Networks Limited

Inventor： Kim B. Roberts ,  Leo Strawczynski ,  Adrien Comeau ,  John McNicol ,  Maurice O'Sullivan ,  Kieran Parsons

IPC: H04B010/12

CPC classification number: H04B10/25137 ,  H04B10/2572

Abstract: Polarization Dependent Effects (PDEs), including Polarization Mode Dispersion (PMD) and Polarization Dependent Loss (PDL) imposed on optical signals conveyed through an optical link are compensated by processing an input signal in the electrical domain prior to transmission. A compensation function is derived that at least partially compensates the PDEs. The communications signal is then processed in the electrical domain using the compensation function to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical link. The PDEs of the optical link operate of the predistorted optical signal such at that substantially undistorted optical signal is received at a receiving end of the link.

Abstract translation: 通过在传输之前处理电域中的输入信号，来补偿施加在通过光链路传送的光信号上的极化相关效应（PDE），包括极化模式色散（PMD）和极化相关损耗（PDL）。 导出补偿功能，至少部分补偿PDE。 然后使用补偿功能在电域中处理通信信号以产生电预失真信号。 然后，电预失真信号用于调制光源以产生用于通过光链路传输的相应的预失真光信号。 光链路的PDE操作预失真的光信号，因为在链路的接收端处接收到基本上未失真的光信号。

公开(公告)号：US20040067064A1

公开(公告)日：2004-04-08

申请号：US10262944

申请日：2002-10-03

Applicant: Nortel Networks Limited

Inventor： John McNicol ,  Kieran Parsons ,  Leo Strawczynski ,  Kim B. Roberts

IPC: H04B010/00 ,  H04B010/12

CPC classification number: H04B10/07951 ,  H04B10/07953 ,  H04B10/25137 ,  H04B10/505 ,  H04B10/50597 ,  H04B10/508 ,  H04B10/6161

Abstract: Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. Electrical domain compensation can be implemented in either the transmitter or the receiver end of the communications system. In preferred embodiments, compensation is implemented in the transmitter, using a look-up-table and digital-to-analog converter to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system.

Abstract translation: 施加在通过光通信系统传送的通信信号上的光色散通过调制电域中的通信信号来补偿。 确定基本上减轻色散的补偿功能。 然后使用补偿功能在电域中调制通信信号。 可以在通信系统的发射机或接收机端实现电域补偿。 在优选实施例中，使用查找表和数模转换器来在发射机中实现补偿以产生电预失真信号。 然后，电预失真信号用于调制光源以产生用于通过光通信系统传输的相应的预失真光信号。

公开(公告)号：US20040213338A1

公开(公告)日：2004-10-28

申请号：US10145035

申请日：2002-05-15

Applicant: Nortel Networks Limited

Inventor： Leo Strawczynski ,  Kim B. Roberts

IPC: H04B010/08 ,  H04B010/02

CPC classification number: H04B10/077 ,  H04B10/07955 ,  H04B2210/258

Abstract: A digital performance monitoring method and system for an optical communications system utilizes a channel monitor and a digital signal processor (DSP). The channel monitor is designed to monitor a respective channel signal of the optical communications system, and includes: a sample memory adapted to store sample data including a set of sequential N-bit (where Nnull1) samples generated by an Analog-to-Digital (A/D) converter at a timing of a predetermined sample clock during a predetermined time interval; and a controller adapted to control storage of the sample data to the sample memory. The digital signal processor (DSP) is designed to calculate at least one performance parameter of the optical communications system based on the sample data.

Abstract translation: 用于光通信系统的数字性能监测方法和系统利用信道监视器和数字信号处理器（DSP）。 信道监视器被设计为监视光通信系统的相应信道信号，并且包括：采样存储器，其适于存储采样数据，该采样数据包括由模数转换器产生的一组顺序N位（其中N> = 1）样本 数字（A / D）转换器在预定时间间隔内在预定采样时钟的定时; 以及控制器，其适于将样本数据的存储控制到所述样本存储器。 数字信号处理器（DSP）被设计为基于样本数据来计算光通信系统的至少一个性能参数。

公开(公告)号：US20020114358A1

公开(公告)日：2002-08-22

申请号：US09789559

申请日：2001-02-22

Applicant: Nortel Networks Limited

Inventor： Kim B. Roberts ,  Ronald J. Gagnon

IPC: H04J003/00

CPC classification number: H04L1/0071 ,  H03M13/27 ,  H03M13/2921 ,  H03M13/6561 ,  H04L1/0041 ,  H04L1/0045

Abstract: multiple sub-streams are aharmonicaly interleaved into a high speed data signal by interleaving successive blocks of data from each sub-stream into the high-speed data signal using a predetermined interleaving pattern that is different for two consecutive sequences of N (an integer >2) blocks of data within the high-speed data signal. The resulting irregular distribution of bits of each sub-stream within the high speed data signal reduces the probability that error bursts due to low frequency noise will be localized in one or more of the recovered sub-stream extracted from the high speed data signal. This improved distribution of bit errors across the sub-streams reduces bit error rates in the most highly errored sub-streams, and thereby enables an increase in signal reach.

Abstract translation: 通过使用针对N（整数2）的两个连续序列不同的预定交织模式，将来自每个子流的连续的数据块交织到高速数据信号中，将多个子流进行交织成高速数据信号 ）高速数据信号中的数据块。 高速数据信号中每个子流的比特的不规则分布减少了由于低频噪声导致的错误突发将被定位在从高速数据信号提取的一个或多个恢复的子流中的概率。 这种改进的子流中的位错误分布减少了最高错误子流中的误码率，从而使信号范围增加。

公开(公告)号：US20040208618A1

公开(公告)日：2004-10-21

申请号：US10209904

申请日：2002-08-02

Applicant: Nortel Networks Limited

Inventor： Kim B. Roberts ,  Richard D. Habel ,  Maurice S. O' Sullivan

IPC: H04B010/00 ,  H04B010/12

CPC classification number: H04B10/2569

Abstract: A method and system is provided for compensating polarization mode dispersion (PMD) in an optical communications system includes a controller designed to control a broadband PMD compensator to differentially delay light at each one of a plurality of selected wavelengths. At least one of the selected wavelengths lies between an adjacent pair of channel wavelengths of the optical communications system. A performance parameter value indicative of PMD is measured at each channel wavelength of the optical communications system. An estimated performance parameter value is then calculated at each selected wavelength, and an error function calculated as a function of wavelength based on the estimated performance parameter values. The broadband PMD compensator is then controlled to minimize the value of the error function.

Abstract translation: 提供了一种用于补偿光通信系统中的偏振模色散（PMD）的方法和系统，包括设计成控制宽带PMD补偿器差分延迟多个选定波长中的每一个处的光的控制器。 所选择的波长中的至少一个位于光通信系统的相邻的一对通道波长之间。 在光通信系统的每个信道波长处测量指示PMD的性能参数值。 然后在每个选择的波长处计算估计的性能参数值，并且基于估计的性能参数值计算作为波长的函数的误差函数。 然后控制宽带PMD补偿器以最小化误差函数的值。

公开(公告)号：US20040208565A1

公开(公告)日：2004-10-21

申请号：US10014353

申请日：2001-12-14

Applicant: Nortel Networks Limited

Inventor： Kim B. Roberts ,  Wolfgang Oberhammer ,  Maurice S. O'Sullivan ,  Roland A. Smith

IPC: H04J014/02 ,  H04B010/00

CPC classification number: H04B10/2563 ,  H04J14/02

Abstract: A method and system for reducing non-linear signal degradation effects of WDM optical signals exacerbated by highly correlated bit patterns of optical waveforms in neighboring optical channels. Embodiments include offsetting the transmission times of signals in neighboring channels, and applying different scrambling patterns to the respective data streams prior to transmission on neighboring optical channels.

Abstract translation: 一种用于减少WDM光信号的非线性信号劣化效应的方法和系统，其由相邻光信道中的光波形的高度相关位模式加剧。 实施例包括抵消相邻信道中的信号的传输时间，以及在相邻光信道上传输之前将各种数据流应用不同的加扰模式。

公开(公告)号：US20040197103A1

公开(公告)日：2004-10-07

申请号：US10405236

申请日：2003-04-03

Applicant: Nortel Networks Limited

Inventor： Kim B. Roberts ,  Leo Strawczynski ,  Maurice S. O'Sullivan

IPC: H04B010/00

CPC classification number: H04B10/2543

Abstract: Nonlinearity-induced signal distortions are compensated by processing an input communications signal, in the electrical domain prior to Electrical-to-optical conversion and transmission through an optical link of a communications system. According to the invention, a compensation operator is determined that substantially mitigates the nonlinearity-induced signal distortions imparted to an optical signal traversing the communications system. The input communications signal is then input to the compensation operator to generate a predistorted electrical signal. This predistorted electrical signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system. With this arrangement, arbitrary nonlinearity-induced signal distortions imparted by the optical link can be compensated in such a manner that a comparatively undistorted optical signal is obtained at the receiving end of the optical link.

Abstract translation: 在通过通信系统的光链路的电 - 光转换和传输之前，通过处理电域中的输入通信信号来补偿非线性引起的信号失真。 根据本发明，确定补偿算子，其基本上减轻施加到穿过通信系统的光信号的非线性引起的信号失真。 然后将输入通信信号输入到补偿操作器以产生预失真的电信号。 然后，该预失真的电信号用于调制光源以产生用于通过光通信系统传输的相应的预失真光信号。 通过这种布置，可以以在光链路的接收端获得相对不失真的光信号的方式来补偿由光链路赋予的任意非线性引起的信号失真。

公开(公告)号：US20030099231A1

公开(公告)日：2003-05-29

申请号：US09992410

申请日：2001-11-26

Applicant: Nortel Networks Limited

Inventor： Malcolm Betts ,  Kim B. Roberts ,  Ronald J. Gagnon

IPC: H04L012/50

CPC classification number: H04Q11/0478 ,  H04J3/0623 ,  H04J3/1611 ,  H04J2203/0003 ,  H04J2203/0014 ,  Y10S370/907

Abstract: A serial data stream is mapped through a cross-connect via two or more parallel independent shelves. The serial data stream is split into at least two sub-streams. If the lead frame of a sub-stream contains a concatenation indicator, it is replacing by a valid payload pointer, and a split indicator is inserted into the frame. Each of the sub-streams is then mapped through the cross-connect via a respective parallel independent shelf. Finally, the sub-streams are recombined to form an output serial data stream equivalent to the original serial data stream. If the lead frame of a sub-stream contains a split indicator, a concatenation indicator is inserted into the corresponding frame of the output serial data stream to restore the concatenation of the original serial data stream. Otherwise, a payload pointer within the lead frame is replaced by a valid payload pointer in the corresponding frame of the output data stream.

Abstract translation: 串行数据流通过两个或更多个并行独立的架子通过交叉连接进行映射。 串行数据流被分成至少两个子流。 如果子流的引导帧包含级联指示符，则它将替换为有效的有效负载指针，并将分割指示符插入到该帧中。 然后通过交叉连接经由相应的并行独立搁架映射每个子流。 最后，子流被重组以形成等同于原始串行数据流的输出串行数据流。 如果子流的引导帧包含分离指示符，则将串联指示符插入到输出串行数据流的相应帧中，以恢复原始串行数据流的级联。 否则，引导帧内的有效载荷指针将被输出数据流的相应帧中的有效载荷指针所取代。