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    ELECTRICAL DOMAIN COMPENSATION OF NON-LINEAR EFFECTS IN AN OPTICAL COMMUNICATIONS SYSTEM
    2.
    发明申请
    ELECTRICAL DOMAIN COMPENSATION OF NON-LINEAR EFFECTS IN AN OPTICAL COMMUNICATIONS SYSTEM 审中-公开
    光学通信系统中非线性效应的电场补偿

    公开(公告)号：WO2004088883A1

    公开(公告)日：2004-10-14

    申请号：PCT/CA2004/000491

    申请日：2004-04-02

    Applicant: NORTEL NETWORKS LIMITED ,  ROBERTS, Kim B. ,  STRAWCZYNSKI, Leo ,  O'SULLIVAN, Maurice S.

    Inventor： ROBERTS, Kim B. ,  STRAWCZYNSKI, Leo ,  O'SULLIVAN, Maurice S.

    IPC: H04B10/18

    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感应信号失真。 根据本发明，确定补偿算子，其基本上减轻赋予通过通信系统的光信号的非线性感应信号失真。 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未失真的光信号的方式来补偿由光链路赋予的任意非线性感应信号失真。

    CHAIN ENCODING AND DECODING OF HIGH SPEED SIGNALS
    3.
    发明申请
    CHAIN ENCODING AND DECODING OF HIGH SPEED SIGNALS 审中-公开
    链接编码和解码高速信号

    公开(公告)号：WO2015010209A1

    公开(公告)日：2015-01-29

    申请号：PCT/CA2014/050699

    申请日：2014-07-24

    Applicant: CIENA CORPORATION ,  OVEIS GHARAN, Shahab ,  ROBERTS, Kim B.

    Inventor： OVEIS GHARAN, Shahab ,  ROBERTS, Kim B.

    IPC: H04L1/22 ,  H03M13/03 ,  H04B10/516 ,  H04B10/60

    CPC classification number: H04L1/00 ,  H03M13/1515 ,  H03M13/251 ,  H03M13/6325

    Abstract: A method of recovering a value of a symbol received through an optical communications system. A multi-bit estimate of the symbol is subdivided into a first part and a second part, each part including at least one respective bit of the estimate. A most likely value of the first part is detected. The most likely value of the first part is processed using a Forward Error Correction (FEC) decoder to generate a corrected first part value, which is used to detect a most likely value of the second part. The most likely value of the second part is then processed by the FEC decoder to generate a corrected second part, which is combined with the corrected first part to recover the value of the symbol.

    Abstract translation: 一种恢复通过光通信系统接收的符号的值的方法。 符号的多位估计被细分为第一部分和第二部分，每个部分包括估计的至少一个相应位。 检测到第一部分的最有可能的值。 使用前向纠错（FEC）解码器处理第一部分的最可能的值，以产生校正的第一部分值，其用于检测第二部分的最可能的值。 然后由FEC解码器处理第二部分的最可能的值，以产生校正的第二部分，其与校正的第一部分组合以恢复符号的值。

    SIGNAL EQUALIZER IN A COHERENT OPTICAL RECEIVER
    4.
    发明申请
    SIGNAL EQUALIZER IN A COHERENT OPTICAL RECEIVER 审中-公开
    信号均衡器在一个相干的光接收器

    公开(公告)号：WO2009070881A1

    公开(公告)日：2009-06-11

    申请号：PCT/CA2008/002118

    申请日：2008-12-04

    Applicant: NORTEL NETWORKS LIMITED ,  ROBERTS, Kim, B. ,  SUN, Han

    Inventor： ROBERTS, Kim, B. ,  SUN, Han

    IPC: H04B10/18 ,  G06F17/14 ,  G06F17/15 ,  G06F17/16 ,  H04B10/06

    CPC classification number: H04B10/6971 ,  H04B10/2569 ,  H04B10/2572 ,  H04B10/532 ,  H04B10/677

    Abstract: A signal equalizer for compensating impairments of an optical signal received through a link of a high speed optical communications network. At least one set of compensation vectors are computed for compensating at least two distinct types of impairments. A frequency domain processor is coupled to receive respective raw multi-bit in-phase (I) and quadrature (Q) sample streams of each received polarization of the optical signal. The frequency domain processor operates to digitally process the multi-bit sample streams, using the compensation vectors, to generate multi-bit estimates of symbols modulated onto each transmitted polarization of the optical signal. The frequency domain processor exhibits respective different responses to each one of the at least two distinct types of impairments.

    Abstract translation: 一种信号均衡器，用于补偿通过高速光通信网络的链路接收的光信号的损伤。 计算至少一组补偿向量以补偿至少两种不同类型的损伤。 频域处理器被耦合以接收光信号的每个接收极化的相应的原始多位同相（I）和正交（Q）采样流。 频域处理器操作以使用补偿矢量对多位采样流进行数字处理，以产生调制到光信号的每个透射偏振上的符号的多位估计。 所述频域处理器对所述至少两种不同类型的损伤中的每一种表现出相应的不同响应。

    HIGH SPECTRAL EFFICIENCY, HIGH PERFORMANCE OPTICAL MUX AND DEMUX ARCHITECTURE
    5.
    发明申请
    HIGH SPECTRAL EFFICIENCY, HIGH PERFORMANCE OPTICAL MUX AND DEMUX ARCHITECTURE 审中-公开
    高光谱效率，高性能光学多路复用器和DEMUX架构

    公开(公告)号：WO2002082706A2

    公开(公告)日：2002-10-17

    申请号：PCT/CA2002/000452

    申请日：2002-04-03

    Applicant: NORTEL NETWORKS LIMITED ,  BOERTJES, David, W. ,  ROBERTS, Kim, B.

    Inventor： BOERTJES, David, W. ,  ROBERTS, Kim, B.

    IPC: H04J14/02

    CPC classification number: H04B10/2513 ,  H04J14/02

    Abstract: The present invention discloses a high performance optical architecture for multiplexing and demultiplexing channels for use in high spectral efficiency optical systems. In general, the MUX and DeMUX architectures of the present invention will fall into two key sections or stages: a wavelength group section and a channel section. The group section makes use of characteristic associated with groups of multiplexed channels for separating said groups from an optical signal having a plurality of multiplexed groups. Advantageously, in preferred embodiments, the channel section is colorless (non-wavelength specific between groups) in order to reduce cost and complexity. With respect to the colorless channel section, components with free spectral ranges (FSRs) have been strategically added to provide repetitive optical filtering functions on group of channels (i.e. , subsets of channels within each band of wavelengths) so that the colorless channel section can operate in any respective group identically. Hence each of said colorless channel sections are interchangeable. Advantageously Distortion compensation can be performed on a per group basis.

    Abstract translation: 本发明公开了一种用于在高光谱效率光学系统中使用的多路复用和解复用信道的高性能光学架构。 通常，本发明的MUX和DeMUX架构将分为两个关键部分或阶段：波长组部分和通道部分。 组部分利用与多路复用信道组相关联的特征，用于将所述组与具有多个多路复用组的光信号分离。 有利地，在优选实施例中，通道部分是无色（组之间的非波长特异性），以便降低成本和复杂性。 关于无色通道部分，已经策略地添加具有自由光谱范围（FSR）的部件，以在通道组（即，波长的每个波段内的通道子集）上提供重复的光学滤波功能，使得无色通道部分可以操作 在任何相应的组中相同。 因此，每个所述无色通道部分是可互换的。 有利地，可以以每组为基础进行失真补偿。

    CLOCK RECOVERY WITH CHANNEL COEFFICIENTS
    6.
    发明申请
    CLOCK RECOVERY WITH CHANNEL COEFFICIENTS 审中-公开
    时钟恢复与通道系数

    公开(公告)号：WO2010115263A1

    公开(公告)日：2010-10-14

    申请号：PCT/CA2010/000461

    申请日：2010-04-01

    Applicant: NORTEL NETWORKS LIMITED ,  SUN, Han ,  WU, Kuang Tsan ,  ROBERTS, Kim B.

    Inventor： SUN, Han ,  WU, Kuang Tsan ,  ROBERTS, Kim B.

    IPC: H04L7/033 ,  H04B10/18

    CPC classification number: H03L7/0812 ,  H04B10/695 ,  H04L7/0087 ,  H04L7/0278

    Abstract: In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal. A channel delay is estimated based on the computed compensation vectors. The estimated channel delay is subtracted from the computed compensation vectors to generate corresponding modified compensation vectors. Finally, the modified compensation vectors are used to derive a recovered clock signal.

    Abstract translation: 在光通信网络的相干光接收机中，从通过光链路接收的高速光信号中恢复时钟信号的方法。 自适应地计算一组补偿矢量，用于补偿因至少光学信号的偏振损伤而引起的符号间干扰（ISI）。 基于所计算的补偿向量来估计信道延迟。 从所计算的补偿向量中减去估计的信道延迟，以产生相应的修改的补偿向量。 最后，修正的补偿向量用于导出恢复的时钟信号。

    HIGH SPEED SIGNAL GENERATOR
    7.
    发明申请
    HIGH SPEED SIGNAL GENERATOR 审中-公开
    高速信号发生器

    公开(公告)号：WO2010083588A1

    公开(公告)日：2010-07-29

    申请号：PCT/CA2010/000066

    申请日：2010-01-22

    Applicant: NORTEL NETWORKS LIMITED ,  KRAUSE, David ,  LAPERLE, Charles ,  ROBERTS, Kim, B.

    Inventor： KRAUSE, David ,  LAPERLE, Charles ,  ROBERTS, Kim, B.

    IPC: H03C7/00 ,  H03K12/00 ,  H04B10/04 ,  H04L27/18

    CPC classification number: H04B10/516 ,  H04B10/5055 ,  H04L27/2627

    Abstract: A high-speed signal generator. A digital signal processing (DSP) block generates a set of N (where N is an integer and N≥2) parallel digital sub-band signals, each digital sub-band signal having frequency components within a spectral range between 0Hz and ±Fs/2, where Fs is a sample rate of the digital sub-band signals. A respective Digital -to- Analog Converter (DAC) processes each digital sub-band signal to generate a corresponding analog sub-band signal, each DAC having a sample rate of Fs/2. A combiner combines the analog sub-band signals to generate an output analog signal having frequency components within a spectral range between 0Hz and ±NFs/2.

    Abstract translation: 高速信号发生器。 数字信号处理（DSP）块产生一组N（其中N是整数且N = 2）并行数字子带信号，每个数字子带信号具有在0Hz和±Fs / 2，其中Fs是数字子带信号的采样率。 相应的数模转换器（DAC）处理每个数字子带信号以产生对应的模拟子带信号，每个DAC具有Fs / 2的采样率。 组合器组合模拟子带信号以产生具有在0Hz和±NFs / 2之间的频谱范围内的频率分量的输出模拟信号。

    CYCLE SLIP LOCATION AND CORRECTION
    8.
    发明申请
    CYCLE SLIP LOCATION AND CORRECTION 审中-公开
    循环滑动位置和校正

    公开(公告)号：WO2010063092A1

    公开(公告)日：2010-06-10

    申请号：PCT/CA2009/001604

    申请日：2009-11-12

    Applicant: NORTEL NETWORKS LIMITED ,  HARLEY, James ,  ROBERTS, Kim, B. ,  SUN, Han

    Inventor： HARLEY, James ,  ROBERTS, Kim, B. ,  SUN, Han

    IPC: H04B10/18 ,  H04B10/148

    CPC classification number: H03M13/336 ,  H03M13/333 ,  H04B10/611 ,  H04B10/6164

    Abstract: Methods and techniques are disclosed for correcting the effect of cycle slips in a coherent communications system A signal comprising SYNC bursts having a predetermined periodicity and a plurality of known symbols at predetermined locations between successive SYNC bursts is received The received signal is partitioned into data blocks Each data block encompasses at least data symbols and a set of check symbols corresponding to the plurality of known symbols at predetermined locations between a respective pair of successive SYNC bursts in the signal Each data block is processed to detect a cycle slip When a cycle slip is detected, the set of check symbols of the data block are examined to identify a first slipped check symbol, and a phase correction applied to data symbols of the data block lying between the first slipped check symbol and an end of the data block.

    Abstract translation: 公开了用于校正相干通信系统中的周期滑移的影响的方法和技术。接收信号被分割成数据块。每个信号被分成数据块 数据块至少包含数据符号和对应于多个已知符号的一组检查符号，该信号在信号中相应的连续SYNC脉冲串之间的预定位置处被处理以检测周期滑移当检测到周期滑移时 检查数据块的校验符号集合以识别第一滑动校验符号，以及应用于位于第一滑动校验符号和数据块的结尾之间的数据块的数据符号的相位校正。

    LOW DENSITY PARITY CHECK (LDPC) DECODER USING BROADCAST MESSAGING
    9.
    发明申请
    LOW DENSITY PARITY CHECK (LDPC) DECODER USING BROADCAST MESSAGING 审中-公开
    低密度奇偶校验（LDPC）解码器使用广播消息传递

    公开(公告)号：WO2010012072A1

    公开(公告)日：2010-02-04

    申请号：PCT/CA2009/000912

    申请日：2009-06-30

    Applicant: NORTEL NETWORKS LIMITED ,  ROBERTS, Kim, B. ,  VERGHESE, Manoj ,  HARLEY, James ,  BEVAN, David, Damian, Nicholas

    Inventor： ROBERTS, Kim, B. ,  VERGHESE, Manoj ,  HARLEY, James ,  BEVAN, David, Damian, Nicholas

    IPC: H04L1/22 ,  H03M13/11

    CPC classification number: H03M13/1134 ,  H03M13/1114 ,  H04L1/0052 ,  H04L1/0057

    Abstract: In a decoder implementing a belief propagation algorithm for iteratively decoding a Low Density Parity Check (LDPC) encoded data block, a method of computing messages to be sent by a first node of the decoder to at least one neighbour node of the decoder. The method comprises: processing messages received by the first node to remove an echo of a previous message sent by the first node to the at least one neighbour node in a previous iteration, to yield corresponding modified messages; computing a message for a current iteration using the modified messages; and broadcasting the computed message for the current iteration to each of the at least one neighbour nodes.

    Abstract translation: 在实现用于迭代解码低密度奇偶校验（LDPC）编码数据块的置信传播算法的解码器中，一种计算要由解码器的第一节点发送到解码器的至少一个相邻节点的消息的方法。 该方法包括：处理由第一节点接收的消息，以将先前迭代中的第一节点发送的先前消息的回波消除到至少一个相邻节点，以产生相应的修改消息; 使用修改的消息计算当前迭代的消息; 以及将针对当前迭代的所计算的消息广播到所述至少一个相邻节点中的每一个。

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