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    High-speed digital signal processing in a coherent optical receiver
    2.
    发明授权
    High-speed digital signal processing in a coherent optical receiver 有权
    相干光接收机中的高速数字信号处理

    公开(公告)号：US07769305B1

    公开(公告)日：2010-08-03

    申请号：US11533940

    申请日：2006-09-21

    申请人： Kim B. Roberts ,  Han Sun ,  Chandra Bontu ,  Kuang Tsan Wu

    发明人： Kim B. Roberts ,  Han Sun ,  Chandra Bontu ,  Kuang Tsan Wu

    IPC分类号： H04B10/00

    CPC分类号： H04L7/0075 ,  H04B10/60 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/6165 ,  H04L7/0004

    摘要： In a coherent optical receiver, a frequency domain engine digitally processes at least two multi-bit sample streams of a received optical signal. The frequency domain engine includes a Fast Fourier Transform (FFT) filter for computing a complex vector representative of a frequency-domain spectrum of the received optical signal. A transpose and add block computes a vector sum of the complex vector and a transposed version of the complex vector, and an Inverse Fast Fourier Transform (IFFT) filter computes a complex output vector from the addition result. With this arrangement, parallel real filter operations are efficiently performed on each of the multi-bit sample streams, using a single back-to-back FFT-IFFT filter structure.

    摘要翻译： 在相干光接收机中，频域引擎对接收到的光信号的至少两个多比特采样数字进行数字处理。 频域引擎包括用于计算表示所接收的光信号的频域频谱的复矢量的快速傅里叶变换（FFT）滤波器。 转置和加法块计算复矢量的矢量和和复矢量的转置版本，而快速傅里叶逆变换（IFFT）滤波器根据相加结果计算复数输出矢量。 利用这种布置，使用单个背靠背FFT-IFFT滤波器结构，对每个多比特采样流有效地执行并行实际滤波器操作。

    Efficient data transmission and training of data processing functions
    5.
    发明授权
    Efficient data transmission and training of data processing functions 失效
    高效的数据传输和数据处理功能的培训

    公开(公告)号：US07522841B2

    公开(公告)日：2009-04-21

    申请号：US11328199

    申请日：2006-01-10

    申请人： Chandra Bontu ,  Kuang Tsan Wu ,  John McNicol ,  Kim B. Roberts ,  Han Sun

    发明人： Chandra Bontu ,  Kuang Tsan Wu ,  John McNicol ,  Kim B. Roberts ,  Han Sun

    IPC分类号： H04B10/00

    CPC分类号： H04J3/0608 ,  H04J14/06 ,  H04L7/027 ,  H04L7/0278 ,  H04L7/048

    摘要： A method of a conveying data through an optical communications system. An optical signal is received through the optical communication system, the optical signal comprising data symbols and SYNC bursts, each SYNC burst having a predetermined symbol sequence. The received optical signal is oversampled to generate a multi-bit sample stream. The sample stream is partitioned into blocks of contiguous samples, wherein each block of samples partially overlaps at least one other block of samples and encompasses at least one SYNC burst and a plurality of data symbols. Each block of samples is independently processed to detect a value of each data symbol.

    摘要翻译： 一种通过光通信系统传送数据的方法。 通过光通信系统接收光信号，光信号包括数据符号和SYNC脉冲串，每个SYNC脉冲串具有预定的符号序列。 所接收的光信号被过采样以产生多比特采样流。 样本流被划分为连续样本块，其中每个样本块与至少一个其他样本块部分重叠，并且包含至少一个SYNC突发和多个数据符号。 每个样本块被独立地处理以检测每个数据符号的值。

    Non-linear equalizer in a coherent optical receiver
    6.
    发明授权
    Non-linear equalizer in a coherent optical receiver 有权
    相干光接收机中的非线性均衡器

    公开(公告)号：US07684712B1

    公开(公告)日：2010-03-23

    申请号：US11551367

    申请日：2006-10-20

    申请人： Kim B. Roberts ,  Chandra Bontu ,  Kuang Tsan Wu ,  Han Sun

    发明人： Kim B. Roberts ,  Chandra Bontu ,  Kuang Tsan Wu ,  Han Sun

    IPC分类号： H04B10/06 ,  H04L27/06

    CPC分类号： H04L7/0075 ,  H04B10/60 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/6165 ,  H04L7/0004

    摘要： A method of recovering a most likely value of each symbol transmitted through an optical communications network using a high speed optical signal. A stream of multi-bit digital samples of the optical signal is processed to generate a respective multi-bit estimate X′(n) of each transmitted symbol. A first function is applied to each symbol estimate X′(n) to generate a corresponding soft decision value {tilde over (X)}(n). Each soft decision value {tilde over (X)}(n) is processed to generate a corresponding hard decision value. {circumflex over (X)}(n) having an ideal amplitude and phase. A plurality of successive soft decision values and hard decision values are processed to determine a second function, which is applied to each soft decision value {tilde over (X)}(n) to generate a most likely symbol value {circumflex over ({circumflex over (X)}(n).

    摘要翻译： 一种利用高速光信号恢复通过光通信网传输的每个符号的最可能值的方法。 对光信号的多比特数字样本流进行处理以产生每个发送符号的相应的多比特估计X'（n）。 将第一函数应用于每个符号估计X'（n）以产生相应的软判决值{（X）}（n）上的波浪号。 处理每个软决策值（对（X）}（n）的波形）以产生相应的硬判决值。 （X）}（n）具有理想的振幅和相位。 处理多个连续的软判决值和硬判决值以确定第二函数，其被应用于每个软判决值（（X）}（n）上的波形）以产生最可能的符号值{回旋（{circumflex （X）}（n）。

    Signal acquisition in a coherent optical receiver
    7.
    发明授权
    Signal acquisition in a coherent optical receiver 有权
    相干光接收机中的信号采集

    公开(公告)号：US07636525B1

    公开(公告)日：2009-12-22

    申请号：US11423822

    申请日：2006-06-13

    申请人： Chandra Bontu ,  Kim B. Roberts ,  Han Sun ,  Edgar Velez ,  Kuang Tsan Wu

    发明人： Chandra Bontu ,  Kim B. Roberts ,  Han Sun ,  Edgar Velez ,  Kuang Tsan Wu

    IPC分类号： H04B10/06

    CPC分类号： H04L7/0075 ,  H04B10/60 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/6165 ,  H04L7/0004

    摘要： A method and system for initializing a coherent optical receiver. Upon detection of an optical signal, a multi-bit digital sample stream of the optical signal is digitally processed to initialize each one of a plurality of adaptive control blocks of the coherent optical receiver. The adaptive control blocks include at least a dispersion compensation block and a clock recovery block. The dispersion compensation block is initialized before initializing the clock recovery block.

    摘要翻译： 一种用于初始化相干光接收机的方法和系统。 在检测到光信号时，数字地处理光信号的多比特数字样本流，以初始化相干光接收机的多个自适应控制块中的每一个。 自适应控制块至少包括色散补偿块和时钟恢复块。 在初始化时钟恢复块之前初始化色散补偿块。

    OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK
    9.
    发明申请
    OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK 有权
    使用接收器反馈的光传输器误差减少

    公开(公告)号：US20100067902A1

    公开(公告)日：2010-03-18

    申请号：US12211216

    申请日：2008-09-16

    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： H04B10/04 ,  H04B10/08 ,  H04B10/00

    CPC分类号： H04B10/0799

    摘要： Described is a method of reducing transmitter error in an optical communications channel. An optical signal transmitted from an optical transmitter that has impairment due to transmitter error is processed to generate a digitally-equalized signal. A nonlinear characteristic of the digitally-equalized signal that relates to the transmitter error is determined. An optical control signal comprising data that are based on the nonlinear characteristic is transmitted to the optical transmitter. The optical transmitter modifies a transmitter parameter in response to the optical control signal to change the nonlinear characteristic and thereby reduce the impairment.

    摘要翻译： 描述了减少光通信信道中的发射机误差的方法。 处理从发射机发生故障的光发射机发送的光信号，生成数字均衡信号。 确定与发射机误差有关的数字均衡信号的非线性特性。 包括基于非线性特性的数据的光控制信号被发送到光发射机。 光发射机根据光控信号修改发射机参数，改变非线性特性，从而减少损伤。

    Clock recovery with channel coefficients
    10.
    发明授权
    Clock recovery with channel coefficients 有权
    时钟恢复与通道系数

    公开(公告)号：US08452186B2

    公开(公告)日：2013-05-28

    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。