公开(公告)号：US08744279B2

公开(公告)日：2014-06-03

申请号：US13205437

申请日：2011-08-08

申请人： Fan Mo ,  Sameep Dave ,  Lawrence W. Esker

发明人： Fan Mo ,  Sameep Dave ,  Lawrence W. Esker

IPC分类号： H04B10/06

CPC分类号： H04B10/6165 ,  H04B10/2569 ,  H04B10/613 ,  H04B10/6166 ,  H04B10/6971 ,  H04L25/03057

摘要： Polarization mode dispersion (PMD) in a dual-pole optical communications network is compensated for using an adaptive PMD equalizer. The PMD equalizer may include a number of substantially identical filter modules that provide partial outputs which may be combined to form a PMD compensated output. A constant modulus algorithm (CMA)-based equalizer may track PMD across both poles and generates an error signal. The CMA-based equalizer includes a filter bank, and uses an update algorithm and tap/output adjustments based on a difference between combined tap energies and an index, and feedback from a forward error correction code frame synchronizer.

摘要翻译： 使用自适应PMD均衡器来补偿双极光通信网络中的极化模式色散（PMD）。 PMD均衡器可以包括多个基本相同的滤波器模块，其提供可以组合以形成PMD补偿输出的部分输出。 基于恒模算法（CMA）的均衡器可以跟踪两极的PMD并产生误差信号。 基于CMA的均衡器包括滤波器组，并且使用基于组合抽头能量和索引之间的差的更新算法和抽头/输出调整以及来自前向纠错码帧同步器的反馈。

公开(公告)号：US20120230676A1

公开(公告)日：2012-09-13

申请号：US13413873

申请日：2012-03-07

申请人： Fan Mo ,  Sameep Dave ,  Christian Rasmussen ,  Mehmet Aydinlik ,  Graeme Pendock

发明人： Fan Mo ,  Sameep Dave ,  Christian Rasmussen ,  Mehmet Aydinlik ,  Graeme Pendock

IPC分类号： H04J14/06 ,  H04B10/08

CPC分类号： H04J14/06 ,  H04B10/614 ,  H04B10/6166

摘要： In an optical transmission system which utilizes polarization multiplexing, a receiver includes an adaptive equalizer which is adjusted at turn-up such that two polarization modes at the equalizer output are time aligned. The adaptive equalizer may be reset in a directed manner in response to an indication that one polarization mode is present at both the first and second outputs. Further, the dominant filters taps of the adaptive equalizer are maintained near a middle of a tap index range. The receiver may also include an interpolation function upstream of the adaptive equalizer and a symbol timing error estimation function that feeds a control signal back to the interpolation function, wherein the interpolation function causes the adaptive equalizer function and symbol timing error estimation function to receive an integer number of samples per symbol.

摘要翻译： 在利用偏振复用的光传输系统中，接收机包括一个自适应均衡器，该自适应均衡器在上电时被调整，使得均衡器输出处的两个偏振模式被时间对准。 响应于在第一和第二输出处存在一个偏振模式的指示，自适应均衡器可以以有向的方式被复位。 此外，自适应均衡器的主要滤波器抽头保持在分接索引范围的中间附近。 接收机还可以包括自适应均衡器上游的内插函数和将控制信号反馈给内插函数的符号定时误差估计函数，其中插值函数使得自适应均衡器函数和符号定时误差估计函数接收整数 每个符号的样本数。

公开(公告)号：US08731413B1

公开(公告)日：2014-05-20

申请号：US13356167

申请日：2012-01-23

申请人： Sameep Dave ,  Matthew Nimon ,  Fan Mo ,  William Thesling

发明人： Sameep Dave ,  Matthew Nimon ,  Fan Mo ,  William Thesling

IPC分类号： H04B10/00

CPC分类号： H04B10/25137 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/60 ,  H04B10/6971 ,  H04L7/0075 ,  H04L25/03834

摘要： Methods, systems, and devices are described for modulating and demodulating data on optical signals. During modulation, at least one stream of symbol mapped bits is filtered with at least one pulse shaping filter to reduce a bandwidth of the stream of bits and to pre-compensate for at least one identified non-ideal transmission condition. The filtered bits are modulated onto a waveform in the digital domain, and the modulated filtered bits are transmitted to digital-to-analog converter. The output of the digital-to-analog converter is converted to an optical signal. During demodulation, a received optical signal is sampled at a first sampling rate at an ADC, downsampled to a lower sampling rate for filtering, filtered with at least one discrete pulse-shaping filter, upsampled for equalization and demodulation, and then equalized and demodulated.

摘要翻译： 描述了用于调制和解调光信号数据的方法，系统和装置。 在调制期间，利用至少一个脉冲整形滤波器对符号映射比特的至少一个流进行滤波，以减少比特流的带宽并对至少一个识别的非理想传输条件进行预补偿。 滤波后的位被调制到数字域中的波形上，调制滤波后的位被传送到数模转换器。 数/模转换器的输出转换为光信号。 在解调期间，接收到的光信号以ADC的第一采样率进行采样，下采样到较低的采样率进行滤波，用至少一个离散脉冲整形滤波器滤波，对采样进行均衡和解调，然后进行均衡和解调。

公开(公告)号：US20060107181A1

公开(公告)日：2006-05-18

申请号：US11249197

申请日：2005-10-13

申请人： Sameep Dave ,  Fan Mo

发明人： Sameep Dave ,  Fan Mo

IPC分类号： H03M13/00

CPC分类号： H03M13/1137

摘要： A decoder may perform node data reordering for bit node processing and node data reordering for bit node to check node interconnections. The decoder may also utilize a single barrel shifting operation on data read from an edge memory for bit node processing or check node processing during a memory read operation. The decoder may also utilize a single format conversion on data read from an edge memory for bit node processing or check node processing. The decoder may also utilize a simplified check node process for check node processing.

摘要翻译： 解码器可以执行用于位节点处理的节点数据重新排序和用于位节点的节点数据重新排序以校验节点互连。 在存储器读取操作期间，解码器还可以对从边缘存储器读取的数据进行比特节点处理或校验节点处理的单个桶移位操作。 解码器还可以对从边缘存储器读取的数据对位节点处理或校验节点处理采用单一格式转换。 解码器还可以利用用于校验节点处理的简化校验节点过程。

公开(公告)号：US08832534B1

公开(公告)日：2014-09-09

申请号：US12984428

申请日：2011-01-04

申请人： Sameep Dave ,  Fan Mo

发明人： Sameep Dave ,  Fan Mo

IPC分类号： H03M13/00

CPC分类号： H03M13/1111

摘要： Systems, devices, and methods are disclosed for a novel LDPC decoder. An architecture is described to implement a novel sequence of bit node processing (BNP) and check node processing (CNP) operations. More specifically, the BNP may be split into two parts: a BNP accumulator and a BNP extrinsic information calculator. This separation of processing modules may provide for fewer read and write operations to and from edge memory.

摘要翻译： 公开了用于新颖的LDPC解码器的系统，设备和方法。 描述了一种体系结构，以实现位节点处理（BNP）和校验节点处理（CNP）操作的新颖序列。 更具体地，BNP可以分为两部分：BNP累加器和BNP外部信息计算器。 处理模块的这种分离可以为边缘存储器提供更少的读取和写入操作。

公开(公告)号：US08693897B2

公开(公告)日：2014-04-08

申请号：US13205431

申请日：2011-08-08

申请人： Fan Mo ,  William Thesling ,  Matthew Nimon ,  Sameep Dave

发明人： Fan Mo ,  William Thesling ,  Matthew Nimon ,  Sameep Dave

IPC分类号： H04B10/06

CPC分类号： H04L7/0075 ,  H04B10/079 ,  H04B10/2513 ,  H04B10/2569 ,  H04B10/697 ,  H04J14/02 ,  H04L27/2096 ,  H04L27/22 ,  H04L27/223

摘要： Methods, systems, and devices are described for a digital demodulator device for processing received optical signals. The device may include a quadrature error filter that receives a digitized version of an optical signal, and removes quadrature errors to generate a filtered series of data samples. The device may also include a frequency offset removal module for performing frequency rotation on the filtered series of data samples. The device may include a chromatic dispersion compensation module which removes chromatic dispersion from horizontal and vertical polarization channels. The device may include a polarization mode dispersion (PMD)/polarization dependent loss (PDL) compensation module which compensates for interference caused by PMD and PDL. The device may also include a phase recovery module configured to track and correct phase.

摘要翻译： 描述了用于处理接收的光信号的数字解调器装置的方法，系统和装置。 该装置可以包括接收光信号的数字化版本的正交误差滤波器，并且去除正交误差以产生滤波后的一系列数据采样。 该装置还可以包括用于对经过滤波的一系列数据采样进行频率旋转的频偏移除模块。 该装置可以包括从水平和垂直极化通道去除色散的色散补偿模块。 该装置可以包括补偿由PMD和PDL引起的干扰的偏振模色散（PMD）/偏振相关损耗（PDL）补偿模块。 该装置还可以包括配置为跟踪和校正相位的相位恢复模块。

公开(公告)号：US08639126B1

公开(公告)日：2014-01-28

申请号：US13356159

申请日：2012-01-23

申请人： Matthew Nimon ,  Fan Mo ,  William Thesling ,  Sameep Dave

发明人： Matthew Nimon ,  Fan Mo ,  William Thesling ,  Sameep Dave

IPC分类号： H04B10/00

CPC分类号： H04B10/6165 ,  H04B10/2569 ,  H04B10/613 ,  H04B10/6166 ,  H04B10/6971 ,  H04L25/03057

摘要： Methods, systems, and devices are described for compensating for a coarse frequency offset between a received optical signal and a local oscillator at a demodulator. Multiple samples are received of an output of a discrete Fourier transform performed on the received optical signal. A magnitude of each sample is determined, and the determined magnitudes may be filtered by a digital domain filter. A difference is computed between the determined magnitudes for a first set of the samples and the determined magnitudes for a second set of the samples, and a local oscillator correction factor is generated based on at least the computed difference.

摘要翻译： 描述了用于在解调器处补偿接收的光信号和本地振荡器之间的粗略频率偏移的方法，系统和装置。 接收对接收到的光信号执行的离散傅立叶变换的输出的多个样本。 确定每个样本的幅度，并且可以用数字域滤波器对确定的幅度进行滤波。 在第一组样本的确定幅度和第二组样本的确定幅度之间计算差值，并且至少基于所计算的差异产生本地振荡器校正因子。

公开(公告)号：US20120189318A1

公开(公告)日：2012-07-26

申请号：US13205431

申请日：2011-08-08

申请人： Fan Mo ,  William Thesling ,  Matthew Nimon ,  Sameep Dave

发明人： Fan Mo ,  William Thesling ,  Matthew Nimon ,  Sameep Dave

IPC分类号： H04B10/00

CPC分类号： H04L7/0075 ,  H04B10/079 ,  H04B10/2513 ,  H04B10/2569 ,  H04B10/697 ,  H04J14/02 ,  H04L27/2096 ,  H04L27/22 ,  H04L27/223

摘要： Methods, systems, and devices are described for a digital demodulator device for processing received optical signals. The device may include a quadrature error filter that receives a digitized version of an optical signal, and removes quadrature errors to generate a filtered series of data samples. The device may also include a frequency offset removal module for performing frequency rotation on the filtered series of data samples. The device may include a chromatic dispersion compensation module which removes chromatic dispersion from horizontal and vertical polarization channels. The device may include a polarization mode dispersion (PMD)/polarization dependent loss (PDL) compensation module which compensates for interference caused by PMD and PDL. The device may also include a phase recovery module configured to track and correct phase.

摘要翻译： 描述了用于处理接收的光信号的数字解调器装置的方法，系统和装置。 该装置可以包括接收光信号的数字化版本的正交误差滤波器，并且去除正交误差以产生滤波后的一系列数据采样。 该装置还可以包括用于对经过滤波的一系列数据采样进行频率旋转的频偏移除模块。 该装置可以包括从水平和垂直极化通道去除色散的色散补偿模块。 该装置可以包括补偿由PMD和PDL引起的干扰的偏振模色散（PMD）/偏振相关损耗（PDL）补偿模块。 该装置还可以包括配置为跟踪和校正相位的相位恢复模块。

公开(公告)号：US08705664B2

公开(公告)日：2014-04-22

申请号：US13205435

申请日：2011-08-08

申请人： Fan Mo ,  Sameep Dave

发明人： Fan Mo ,  Sameep Dave

IPC分类号： H04L27/22

CPC分类号： H04B10/6165 ,  H04B10/2569 ,  H04B10/613 ,  H04B10/6166 ,  H04B10/6971 ,  H04L25/03057

摘要： A soft-decision forward error correction scheme for received optical signals is described. Differential decoding may be performed, for example, in each polarization after coherent QPSK detection. Hard decisions may be made based on judging the most likely transition between each pair of received input symbols. Soft-input generation is also described, representing the reliability of the hard decisions. The soft-input information may be generated through simplified algorithms that utilize the most likely transitions to determine a reliability assignment.

摘要翻译： 描述了用于接收的光信号的软判决前向纠错方案。 可以例如在相干QPSK检测之后的每个极化中执行差分解码。 可以基于判断每对接收到的输入符号之间的最可能的转换来进行硬判定。 还介绍了软输入代码，代表了硬判决的可靠性。 软输入信息可以通过利用最可能的转换来确定可靠性分配的简化算法生成。

公开(公告)号：US08559828B2

公开(公告)日：2013-10-15

申请号：US13356198

申请日：2012-01-23

申请人： Fan Mo ,  Sameep Dave

发明人： Fan Mo ,  Sameep Dave

IPC分类号： H04B10/00 ,  H04B10/50

CPC分类号： H04B10/505 ,  H04B10/077 ,  H04B10/516 ,  H04B10/6166 ,  H04B10/6971 ,  H04L27/2096 ,  H04L27/22

摘要： Methods, systems, and devices are described for formatting of data streams to be transmitted over fiber optic channels, and for processing received optical signals. A data transmission device may include a digital coding and modulation module that encodes a digital data stream, inserts unique words into the digital data stream, and modulates the encoded data stream and unique words onto optical channels for transmission over an optical fiber. A demodulation and decoding device may include a unique word identification module that identifies the unique words inserted in each optical channel stream, determines one or more characteristics of the plurality of optical channels based on the unique words, and provides the one or more characteristics to one or more other modules in the demodulator and decoding device.