公开(公告)号：US08718491B2

公开(公告)日：2014-05-06

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： H04J14/06 ,  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。

公开(公告)号：US08385747B2

公开(公告)日：2013-02-26

申请号：US13160579

申请日：2011-06-15

申请人： Kim B. Roberts ,  Han Sun

发明人： Kim B. Roberts ,  Han Sun

IPC分类号： H04B10/00

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.

摘要翻译： 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。

公开(公告)号：US07894728B1

公开(公告)日：2011-02-22

申请号：US11550042

申请日：2006-10-17

申请人： Han Sun ,  Chandra Bontu ,  Kim B. Roberts ,  John Sitch ,  John Wolczanski

发明人： Han Sun ,  Chandra Bontu ,  Kim B. Roberts ,  John Sitch ,  John Wolczanski

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 of compensating phase error between parallel digital signals of a received optical signal, in a coherent optical receiver. A phase differential between the digital signals is determined. A digital skew is imposed between the digital signals, an amount of skew imposed being an integer number of sample periods calculated to most nearly compensate the phase differential. The skewed digital signals are then digitally processed, in the frequency domain, to compensate a residual portion of the phase differential.

摘要翻译： 在相干光接收机中补偿接收光信号的并行数字信号之间的相位误差的方法。 确定数字信号之间的相位差。 在数字信号之间施加数字偏移，施加的倾斜量是被计算为最接近地补偿相位差的整数个采样周期。 然后在频域中数字地处理偏斜的数字信号，以补偿相位差的剩余部分。

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。

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。

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。

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。

公开(公告)号：US08166365B2

公开(公告)日：2012-04-24

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： H03M13/11

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，并且应用于位于第一滑动校验符号和第一滑动校验符号的结尾之间的数据块的数据符号的相位校正 数据块。

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）。

公开(公告)号：US07606498B1

公开(公告)日：2009-10-20

申请号：US11366392

申请日：2006-03-03

申请人： Kuang Tsan Wu ,  Han Sun ,  Kim B. Roberts ,  Ruibin Jin ,  James Harley

发明人： Kuang Tsan Wu ,  Han Sun ,  Kim B. Roberts ,  Ruibin Jin ,  James Harley

IPC分类号： H04B10/00

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

摘要： A method of carrier recovery from a high speed optical signal received through an optical communications network. A stream of multi-bit digital samples of the optical signal is processed to generate a multi-bit estimate X′(n) of each one of a plurality of transmitted symbols. A phase of each symbol estimate X′(n) is rotated, and a respective symbol phase error Δφ(n) of the rotated symbol estimate determined.

摘要翻译： 一种通过光通信网络接收的高速光信号的载波恢复方法。 处理光信号的多比特数字样本流以产生多个发送符号中的每一个的多比特估计X'（n）。 每个符号估计X'（n）的相位被旋转，并且确定旋转符号估计的相应符号相位误差Deltaphi（n）。