公开(公告)号：US10211919B2

公开(公告)日：2019-02-19

申请号：US14794944

申请日：2015-07-09

申请人： Shahab Oveis Gharan ,  Kim B. Roberts

发明人： Shahab Oveis Gharan ,  Kim B. Roberts

IPC分类号： H04B10/69 ,  H04L27/26 ,  H04B10/2507

摘要： In a communications system having an analog channel configured to convey a data signal from a transmitter to a receiver, a method of mitigating narrow-band impairment imposed by the analog channel on the data signal within a bounded spectral region of a spectrum of the data signal. A transmitter digital signal processor (Tx DSP) applying a first adaptation function to the data signal prior to transmitting the data signal through the analog channel. A receiver digital signal processor (Rx DSP) applying a second adaptation function to the data signal received through the analog channel. The first and second adaptation functions are selected to cooperatively mitigate effects of the narrow-band impairment imposed by the analog channel.

公开(公告)号：US09325427B1

公开(公告)日：2016-04-26

申请号：US13664576

申请日：2012-10-31

申请人： Shahab Oveis Gharan ,  Kim B. Roberts ,  Mahmoud Taherzadehboroujeni

发明人： Shahab Oveis Gharan ,  Kim B. Roberts ,  Mahmoud Taherzadehboroujeni

IPC分类号： H04B10/69 ,  H04B10/61

CPC分类号： H04B10/695 ,  H04B10/612 ,  H04B10/613 ,  H04B10/614 ,  H04B10/616 ,  H04B10/697 ,  H04L1/0054

摘要： In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.

摘要翻译： 在光通信系统的相干接收机中，处理检测到的符号估计以确定对应的发送数据字的最可能值的方法，所发送的数据字包括使用预定的星座图的发送机中编码的一个或多个数据比特 至少两个符号。 在与数据字的可能值相对应的判定区域中定义一组两个或更多个虚拟星座点。 处理检测到的符号估计以找到给定检测到的符号估计的最可能的虚拟星座点。 基于最可能的虚拟星座点来确定对应的传输数据字的最可能的值。

公开(公告)号：US08594499B1

公开(公告)日：2013-11-26

申请号：US10389804

申请日：2003-03-18

申请人： Kim B. Roberts ,  Maurice S. O'Sullivan ,  Leo L. Strawczynski

发明人： Kim B. Roberts ,  Maurice S. O'Sullivan ,  Leo L. Strawczynski

IPC分类号： H04B10/071

CPC分类号： H04B10/073

摘要： Phase nonlinearities of an optical communications system are monitored by generating a test signal which includes a predetermined property that is uniquely associated with at least one phase nonlinearity of the optical communications system. The predetermined property of the test signal is then detected at a monitoring point of the optical communications system, and used to estimate the associated phase nonlinearity.

摘要翻译： 通过生成包括与光通信系统的至少一个相位非线性唯一相关联的预定属性的测试信号来监视光通信系统的相位非线性。 然后在光通信系统的监视点检测测试信号的预定属性，并用于估计相关的相位非线性。

公开(公告)号：US08315528B2

公开(公告)日：2012-11-20

申请号：US12644409

申请日：2009-12-22

申请人： Kim B. Roberts ,  Ahmed Awadalla

发明人： Kim B. Roberts ,  Ahmed Awadalla

IPC分类号： H04B10/06

CPC分类号： H04B10/6164 ,  H04B10/60 ,  H04B10/611 ,  H04B10/6161

摘要： A method of data symbol recovery in a coherent receiver of an optical communications system. Two or more SYNC bursts, having a known symbol sequence and periodicity, are processed to derive an estimate of a frequency offset Δf between a transmit laser and a Local Oscillator (LO) of the receiver. A phase rotation κ(n) is computed based on the estimate of the frequency offset Δf, and applied to a plurality of data symbol estimates to generate corresponding rotated symbol estimates. The rotated symbol estimates are then filtered to generate corresponding decision values of each data symbol.

摘要翻译： 一种在光通信系统的相干接收机中进行数据符号恢复的方法。 处理具有已知符号序列和周期性的两个或多个SYNC突发，以导出接收机的发射激光器和本地振荡器（LO）之间的频率偏移＆Dgr; f的估计。 基于频率偏移＆Dgr; f的估计来计算相位旋转kgr（n），并将其应用于多个数据符号估计以产生相应的旋转符号估计。 然后对旋转的符号估计进行滤波以产生每个数据符号的相应决定值。

公开(公告)号：US08249467B2

公开(公告)日：2012-08-21

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： H04B10/00 ,  H04B10/06 ,  H04J14/06

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。

公开(公告)号：US07930435B2

公开(公告)日：2011-04-19

申请号：US12114059

申请日：2008-05-02

申请人： Kim B. Roberts

发明人： Kim B. Roberts

IPC分类号： G06F15/16

CPC分类号： H03M7/30 ,  H03M7/3084 ,  H03M7/40 ,  H03M7/4006 ,  H04L69/04

摘要： A method of compressing data traffic for transmission through a network, the method comprises computing, for each one of a plurality of contexts of data traffic within the network, a respective optimal dictionary for encoding data traffic; For each block of data to be transmitted through the network: identifying a block context of the block of data; and encoding the block of data using the respective dictionary computed for the context corresponding to the identified block context.

摘要翻译： 一种压缩数据流量以便通过网络进行传输的方法，所述方法包括针对网络内的数据业务的多个上下文中的每一个计算用于对数据业务进行编码的相应最佳字典; 对于要通过网络传输的每个数据块：识别数据块的块上下文; 以及使用针对与所识别的块上下文相对应的上下文计算的相应字典对数据块进行编码。

公开(公告)号：US07756421B2

公开(公告)日：2010-07-13

申请号：US10405236

申请日：2003-04-03

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

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

IPC分类号： H04B10/00

CPC分类号： H04B10/2543

摘要： 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.

摘要翻译： 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：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：US07382984B2

公开(公告)日：2008-06-03

申请号：US10262944

申请日：2002-10-03

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

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

IPC分类号： H04B10/12 ,  H04B10/00 ,  H04B10/04

CPC分类号： H04B10/07951 ,  H04B10/07953 ,  H04B10/25137 ,  H04B10/505 ,  H04B10/50597 ,  H04B10/508 ,  H04B10/6161

摘要： 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.

摘要翻译： 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：US07305183B2

公开(公告)日：2007-12-04

申请号：US09975985

申请日：2001-10-15

申请人： Kim B. Roberts ,  Giuseppe G. Bordogna ,  Riyaz R. Jamal ,  Douglas D. McGhan ,  Maurice S. O'Sullivan

发明人： Kim B. Roberts ,  Giuseppe G. Bordogna ,  Riyaz R. Jamal ,  Douglas D. McGhan ,  Maurice S. O'Sullivan

IPC分类号： H04B10/08 ,  H04B17/00 ,  H04B10/00 ,  H04J14/06

CPC分类号： H04B10/2572

摘要： A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical communications system. A polarization state of the signal is detected at a selected detection point downstream of the launch point. The PDE is evaluated using the predetermined initial polarization state and the detected polarization state.

摘要翻译： 一种方法和系统能够测量包括多个级联光学部件的光通信系统中的偏振相关损耗（PDL）。 具有预定初始极化状态的光信号被发射到光通信系统中。 在发射点下游的选择的检测点处检测信号的偏振状态。 使用预定的初始极化状态和检测到的偏振状态来评估PDE。