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    CLOCK RECOVERY WITH CHANNEL COEFFICIENTS
    3.
    发明申请
    CLOCK RECOVERY WITH CHANNEL COEFFICIENTS 有权
    时钟恢复与通道系数

    公开(公告)号：US20120063786A1

    公开(公告)日：2012-03-15

    申请号：US13288375

    申请日：2011-11-03

    申请人： Han SUN ,  Kuang Tsan WU ,  Kim B. ROBERTS

    发明人： Han SUN ,  Kuang Tsan WU ,  Kim B. ROBERTS

    IPC分类号： H04B10/00

    CPC分类号： H03L7/0812 ,  H04B10/695 ,  H04L7/0087 ,  H04L7/0278

    摘要： 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.

    摘要翻译： 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。

    CLOCK RECOVERY WITH CHANNEL COEFFICIENTS
    4.
    发明申请
    CLOCK RECOVERY WITH CHANNEL COEFFICIENTS 有权
    时钟恢复与通道系数

    公开(公告)号：US20100254702A1

    公开(公告)日：2010-10-07

    申请号：US12419368

    申请日：2009-04-07

    申请人： Han SUN ,  Kuang Tsan WU ,  Kim B. ROBERTS

    发明人： Han SUN ,  Kuang Tsan WU ,  Kim B. ROBERTS

    IPC分类号： H04B10/08

    CPC分类号： H03L7/0812 ,  H04B10/695 ,  H04L7/0087 ,  H04L7/0278

    摘要： 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.

    摘要翻译： 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。

    OPTICAL MODULATION SCHEMES HAVING REDUCED NONLINEAR OPTICAL TRANSMISSION IMPAIRMENTS
    6.
    发明申请
    OPTICAL MODULATION SCHEMES HAVING REDUCED NONLINEAR OPTICAL TRANSMISSION IMPAIRMENTS 有权
    具有减少非线性光传输损害的光学调制方案

    公开(公告)号：US20140133865A1

    公开(公告)日：2014-05-15

    申请号：US13969694

    申请日：2013-08-19

    申请人： Michael Andrew REIMER ,  Andrew D. SHINER ,  Shahab OVEIS GHARAN ,  Mahmoud TAHERZADEHBOROUJENI ,  Maurice O'SULLIVAN ,  Kim B. ROBERTS

    发明人： Michael Andrew REIMER ,  Andrew D. SHINER ,  Shahab OVEIS GHARAN ,  Mahmoud TAHERZADEHBOROUJENI ,  Maurice O'SULLIVAN ,  Kim B. ROBERTS

    IPC分类号： H04B10/532

    CPC分类号： H04B10/532 ,  H04B10/516

    摘要： A method of transmitting a data signal using an optical transmitter of an optical communications system. The optical transmitter is configured to modulate an optical carrier in successive signalling intervals to generate an optical signal. A modulation scheme is provided which comprises a multi-dimensional symbol constellation. The modulation scheme is designed such that an average degree of polarization of a modulated optical signal output from the optical transmitter has a first value when averaged across a first signalling interval, and has a second value when averaged across more than one and fewer than 100 signalling intervals. The second value is less than 10 percent of the first value. During run-time, an encoder of the optical transmitter encoding a data signal to be transmitted as symbols of the constellation, and a modulator of the optical transmitter modulating available dimensions of the optical carrier in accordance with the symbols.

    摘要翻译： 一种使用光通信系统的光发射机发送数据信号的方法。 光发射机被配置为在连续的信令间隔中调制光载波以产生光信号。 提供了一种包括多维符号星座的调制方案。 调制方案被设计成使得当从第一信令间隔平均时，从光发送器输出的调制光信号的平均偏振度具有第一值，并且当平均多于一个且少于100个信令时具有第二值 间隔 第二个值小于第一个值的10％。 在运行时间期间，光发送器的编码器编码要作为星座符号发送的数据信号，以及根据符号调制光载波的可用尺寸的光发射机的调制器。

    SELF TEST OF A DUAL POLARIZATION TRANSMITTER
    7.
    发明申请
    SELF TEST OF A DUAL POLARIZATION TRANSMITTER 有权
    双极化发射机的自检

    公开(公告)号：US20110222850A1

    公开(公告)日：2011-09-15

    申请号：US12721802

    申请日：2010-03-11

    申请人： Kim B. ROBERTS ,  Maurice O'SULLIVAN ,  Ian BETTY

    发明人： Kim B. ROBERTS ,  Maurice O'SULLIVAN ,  Ian BETTY

    IPC分类号： H04B10/08

    CPC分类号： H04B10/532 ,  H04J14/06

    摘要： A method of testing a dual-polarization optical transmitter comprising a pair of polarization transmitters for respectively generating first and second polarization signals, and a polarization combiner for generating an optical signal composed of the first and second polarization signals with respective orthogonal polarization vectors. Each of the polarization transmitters is controlled to transmit respective polarization optical signals having predetermined characteristics. An output of the dual-polarization optical transmitter is tapped to obtain a first tap signal representative of the first polarization signal, and a second tap signal representative of the second polarization signal. A relative angle between respective polarization vectors of the tap signals is controlled, and the first and second tap signals combined to generate a combined light. A power level of the combined light is detected, and processed to obtain information about the performance of the dual polarization transmitter.

    摘要翻译： 一种测试包括分别产生第一和第二偏振信号的一对偏振发射器的双偏振光发射器的方法，以及用于产生由第一和第二极化信号与各个正交偏振矢量组成的光信号的偏振组合器。 控制每个偏振发射器以​​发送具有预定特性的相应偏振光信号。 双极化光发射机的输出被抽头以获得表示第一极化信号的第一抽头信号，以及表示第二极化信号的第二抽头信号。 控制抽头信号的相应极化矢量之间的相对角度，并且组合第一和第二抽头信号以产生组合的光。 检测组合光的功率电平，并进行处理以获得关于双极化发射器的性能的信息。

    SIGNAL EQUALIZER IN A COHERENT OPTICAL RECEIVER
    8.
    发明申请
    SIGNAL EQUALIZER IN A COHERENT OPTICAL RECEIVER 有权

    公开(公告)号：US20160028481A1

    公开(公告)日：2016-01-28

    申请号：US14810135

    申请日：2015-07-27

    申请人： Kim B. ROBERTS ,  Han SUN

    发明人： Kim B. ROBERTS ,  Han SUN

    IPC分类号： H04B10/2569 ,  H04B10/532 ,  H04B10/69

    CPC分类号： H04B10/6971 ,  H04B10/2569 ,  H04B10/2572 ,  H04B10/532 ,  H04B10/677

    摘要： 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.

    CYCLE SLIP LOCATION AND CORRECTION
    9.
    发明申请
    CYCLE SLIP LOCATION AND CORRECTION 有权
    循环滑动位置和校正

    公开(公告)号：US20100138722A1

    公开(公告)日：2010-06-03

    申请号：US12326933

    申请日：2008-12-03

    申请人： James HARLEY ,  Kim B. ROBERTS ,  Han SUN

    发明人： James HARLEY ,  Kim B. ROBERTS ,  Han SUN

    IPC分类号： H03M13/17 ,  G06F11/08

    CPC分类号： H03M13/336 ,  H03M13/333 ,  H04B10/611 ,  H04B10/6164

    摘要： 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.

    摘要翻译： 公开了用于校正相干通信系统中循环滑移的影响的方法和技术。 接收包括具有预定周期的SYNC脉冲串和在连续SYNC脉冲串之间的预定位置处的多个已知符号的信号。 接收的信号被分割成数据块。 每个数据块在该信号中的相应的一对连续SYNC突发之间的预定位置处至少包含与多个已知符号对应的数据符号和一组校验符号。 处理每个数据块以检测周期滑移。 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，并且将相位校正应用于位于第一滑动校验符号和第一滑动校验符号的结束之间的数据块的数据符号 数据块。

    SOFT DECODING OF DATA IN A COHERENT OPTICAL RECEIVER
    10.
    发明申请
    SOFT DECODING OF DATA IN A COHERENT OPTICAL RECEIVER 有权
    在一个相干光接收器中数据的软解码

    公开(公告)号：US20110103795A1

    公开(公告)日：2011-05-05

    申请号：US12608022

    申请日：2009-10-29

    申请人： Amir Keyvan KHANDANI ,  Han SUN ,  Kim B. ROBERTS

    发明人： Amir Keyvan KHANDANI ,  Han SUN ,  Kim B. ROBERTS

    IPC分类号： H04B10/06

    CPC分类号： H04B10/2572 ,  H04B10/60 ,  H04B10/611 ,  H04B10/613 ,  H04B10/6161 ,  H04B10/6162 ,  H04L25/067 ,  H04L2025/03617

    摘要： In a coherent optical receiver receiving a polarization multiplexed optical signal through an optical communications network, a method of compensating noise due to polarization dependent loss (PDL). A Least Mean Squares (LMS) compensation block processes sample streams of the received optical signal to generate symbol estimates of symbols modulated onto each transmitted polarization of the optical signal. A decorrelation block de-correlates noise in the respective symbol estimates of each transmitted polarization and generating a set of decorrelated coordinate signals. A maximum likelihood estimator soft decodes the de-correlated coordinate signals generated by the decorrelation block.

    摘要翻译： 在通过光通信网络接收偏振复用光信号的相干光接收机中，由偏振相关损耗（PDL）补偿噪声的方法。 最小均方（LMS）补偿块处理所接收的光信号的采样流，以生成调制到光信号的每个透射偏振上的符号的码元估计。 解相关块将各个发射的偏振的相应符号估计中的噪声去相关，并产生一组去相关的坐标信号。 最大似然估计器对解相关块产生的去相关坐标信号进行软解码。