公开(公告)号：US08006163B2

公开(公告)日：2011-08-23

申请号：US11950720

申请日：2007-12-05

申请人： Ivan B. Djordjevic ,  Milorad Cvjetic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Milorad Cvjetic ,  Lei Xu ,  Ting Wang

IPC分类号： H03M13/00 ,  H04L27/06 ,  H04B10/00

CPC分类号： H03M13/2957 ,  H03M13/1102 ,  H03M13/116 ,  H03M13/3905 ,  H03M13/6331 ,  H04B10/2569 ,  H04B10/58 ,  H04B10/6971

摘要： A turbo equalizer includes a Bahl-Cocke-Jelinek-Raviv (BCJR) equalizer configured to receive a transmitted signal and partially cancel inter-symbol interference (ISI) due to polarization-mode dispersion (PMD). A low-density parity check (LDPC) decoder is coupled to the BCJR equalizer to receive channel bit reliabilities therefrom. The LDPC decoder iteratively provides extrinsic soft information feedback to the BCJR equalizer to compensate for PMD.

摘要翻译： 一个Turbo均衡器包括一个Bahl-Cocke-Jelinek-Raviv（BCJR）均衡器，配置成接收发射信号，并部分地消除由于偏振模色散（PMD）引起的符号间干扰（ISI）。 低密度奇偶校验（LDPC）解码器耦合到BCJR均衡器以从其接收信道位可靠性。 LDPC解码器向BCJR均衡器迭代地提供外部软信息反馈以补偿PMD。

公开(公告)号：US20110194855A1

公开(公告)日：2011-08-11

申请号：US12702895

申请日：2010-02-09

申请人： HUSSAM G. BATSHON ,  Lei Xu ,  Ting Wang ,  Ivan B. Djordjevic

发明人： HUSSAM G. BATSHON ,  Lei Xu ,  Ting Wang ,  Ivan B. Djordjevic

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  H04B10/60 ,  H04B10/6161 ,  H04B10/6162

摘要： In a polarization-multiplexing optical communications system, a method and system for coherent reception of polarization-multiplexed optical communications. Training and data sequences are recovered from a plurality of orthogonally polarized signals, such that training and data sequences may be used on a single channel without loss of spectral efficiency. This is accomplished by estimating a channel response for each orthogonally polarized signal based on the mean of the signal and distinguishing between a data sequence and a training sequence in each orthogonally polarized signal. Such distinguishing is accomplished according to an iterative linear minimum mean-square equalization based on the respective channel response estimate.

摘要翻译： 在偏振复用光通信系统中，用于偏振复用光通信的相干接收的方法和系统。 从多个正交极化信号恢复训练和数据序列，使得训练和数据序列可以在单个信道上使用而不损失频谱效率。 这通过基于信号的平均值估计每个正交极化信号的信道响应并且在每个正交极化信号中区分数据序列和训练序列来实现。 这种区分是根据相应的信道响应估计的迭代线性最小均方均衡完成的。

公开(公告)号：US20110182428A1

公开(公告)日：2011-07-28

申请号：US12846915

申请日：2010-07-30

申请人： Yi Zhao ,  Martin Roetteler ,  Lei Xu ,  Ting Wang

发明人： Yi Zhao ,  Martin Roetteler ,  Lei Xu ,  Ting Wang

IPC分类号： H04K1/00

CPC分类号： H04L9/0852

摘要： Systems and methods to communicate securely includes communicating quantum encryption data on a first wavelength-division multiplexing passive optical network (WDM-PON); and communicating data over separate classical channels of a second WDM-PON, wherein the second WDM-PON synchronizes with the first WDM-PON while providing data communication over the classical channels.

摘要翻译： 用于安全通信的系统和方法包括在第一波分复用无源光网络（WDM-PON）上传送量子加密数据; 以及在第二WDM-PON的单独的经典信道上传送数据，其中所述第二WDM-PON与所述第一WDM-PON同步，同时在经典信道上提供数据通信。

公开(公告)号：US20110085797A1

公开(公告)日：2011-04-14

申请号：US12902801

申请日：2010-10-12

申请人： Lei Xu ,  Shaoliang Zhang ,  Jianjun Yu ,  Ting Wang

发明人： Lei Xu ,  Shaoliang Zhang ,  Jianjun Yu ,  Ting Wang

IPC分类号： H04B10/08 ,  H04B10/06

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/6164 ,  H04B10/6165

摘要： Methods and systems for receiving an optical signal using cascaded frequency offset estimation. Coherently detecting an optical signal includes compensating for a coarse laser frequency offset between a transmitting laser and a local oscillator laser by determining a maximum phase error (MPE) in the optical signal, compensating for a residual laser frequency offset between the transmitting laser and the local oscillator laser, and decoding data stored in the optical signal.

摘要翻译： 使用级联频偏估计接收光信号的方法和系统。 相干检测光信号包括通过确定光信号中的最大相位误差（MPE）来补偿发射激光器和本地振荡器激光器之间的粗激光频率偏移，补偿发射激光器和局部振荡器之间的残余激光频率偏移 振荡器激光器和解码存储在光信号中的数据。

公开(公告)号：US20110085624A1

公开(公告)日：2011-04-14

申请号：US12860659

申请日：2010-08-20

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H04L27/06

CPC分类号： H04L25/03171 ,  H04B10/532 ,  H04B10/6971 ,  H04J14/002 ,  H04J14/06 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0071 ,  H04L27/3405

摘要： Systems and methods for optical communication that use a transmitter/receiver. The systems and methods include receiving a modulated, encoded input stream. Channel memory is reduced using coarse digital backpropagation and other channel impairments are removed using turbo equalization. Symbols are detected in the input stream that conform to a non-uniform, polar constellation having a Gaussian source distribution to produce a stream of encoded data. The stream of encoded data is decoded with one or more low density parity check (LDPC) decoders.

摘要翻译： 使用发射机/接收机的光通信系统和方法。 系统和方法包括接收经调制的编码的输入流。 使用粗数字反向传播减少信道存储，并且使用turbo均衡消除其他信道损伤。 在符合具有高斯源分布的非均匀极坐标的输入流中检测符号以产生编码数据流。 编码数据流用一个或多个低密度奇偶校验（LDPC）解码器解码。

公开(公告)号：US20100232789A1

公开(公告)日：2010-09-16

申请号：US12731830

申请日：2010-03-25

申请人： Philip Nan Ji ,  Lei Xu ,  Ting Wang ,  Shuji Murakami ,  Tsutomu Tajima ,  Yutaka Yano

发明人： Philip Nan Ji ,  Lei Xu ,  Ting Wang ,  Shuji Murakami ,  Tsutomu Tajima ,  Yutaka Yano

IPC分类号： H04B10/08

CPC分类号： H04B10/677

摘要： An optical device includes an interferometer for a received optical differential phase shift keying DPSK signal, and an equalizer integrated with the interferometer in a manner for reducing from optical filtering effects an interference by signal bits of the DPSK signal with signal bits of a contiguous DPSK signal. The interferometer is a Michelson delay interferometer type, but can also be a Mach-Zehnder delay interferometer type on fiber, waveguide or other optical structure. The equalizer is a Fabry-Perot type equalizer, but can be a ring resonator type or a fiber based equalizer.

摘要翻译： 光学装置包括用于接收的光学差分相移键控DPSK信号的干涉仪，以及与干涉仪集成的均衡器，以减少光学滤波的方式，利用DPSK信号的信号位与相邻DPSK信号的信号位的干扰 。 干涉仪是迈克尔逊延迟干涉仪型号，但也可以是光纤，波导或其他光学结构上的马赫 - 曾德延迟干涉仪。 均衡器是法布里 - 珀罗型均衡器，但可以是环形谐振器型或基于光纤的均衡器。

公开(公告)号：US07761012B2

公开(公告)日：2010-07-20

申请号：US11621765

申请日：2007-01-10

申请人： Jianjun Yu ,  Lei Xu ,  Philip Nan Ji ,  Ting Wang

发明人： Jianjun Yu ,  Lei Xu ,  Philip Nan Ji ,  Ting Wang

IPC分类号： H04B10/04

CPC分类号： H04B10/508 ,  H04B10/2575 ,  H04B10/505 ,  H04J14/02 ,  H04J14/0256

摘要： A method of generating a dark-RZ pulse in an optical communications system with a dual-arm modulator by setting a direct current bias on the modulator to a specific value such that an output optical power from the modulator achieves a maximum value when the RF signals on the first and second arms of the modulator are off and maintaining the direct current bias at the specific value and applying RF signals to the first and second arms of the modulator and delaying one of the RF signals applied to one of the first and second arms relative to the other of the RF signals such that a dark-RZ pulse is generated with a duty cycle based on the delay. Another aspect of the invention provides a method for generating dense wave division multiplexing (DWDM) optical mm-waves in an optical transmission system by phase modulated DWDM optical signal and applying the phase modulated DWDM optical signal to an input port of an optical interleaver, the optical interleaver having a specified bandwidth to suppress the optical carriers and convert the DWDM optical signal to DWDM optical mm-waves; and amplifying the DWDM optical mm-waves and transmitting the DWDM optical mm-waves over single mode fiber (SMF).

摘要翻译： 一种在具有双臂调制器的光通信系统中通过将调制器上的直流偏置设置为特定值来产生暗RZ脉冲的方法，使得来自调制器的输出光功率在RF信号 在调制器的第一和第二臂处关闭并将直流偏压保持在特定值并且将RF信号施加到调制器的第一和第二臂并且延迟施加到第一和第二臂之一的RF信号之一 相对于RF信号中的另一个，使得以基于延迟的占空比产生暗RZ脉冲。 本发明的另一方面提供了一种通过相位调制DWDM光信号在光传输系统中产生密集波分复用（DWDM）光学毫米波的方法，并将相位调制的DWDM光信号应用于光交织器的输入端口， 具有指定带宽的光交错器以抑制光载波并将DWDM光信号转换为DWDM光学毫米波; 并放大DWDM光学毫米波，并通过单模光纤（SMF）传输DWDM光学毫米波。

公开(公告)号：US20100050048A1

公开(公告)日：2010-02-25

申请号：US12392335

申请日：2009-02-25

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H03M13/29 ,  G06F11/10

CPC分类号： H03M13/1117 ,  H03M13/2957 ,  H03M13/6331 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0071 ,  H04L5/0008 ,  H04L25/03171 ,  H04L25/03203 ,  H04L25/067 ,  H04L27/223 ,  H04L27/2649 ,  H04L2025/03363 ,  H04L2025/03414 ,  H04L2025/03611

摘要： A receiver and method are provided for mitigation of finer non-linearities in multilevel coded-modulation schemes. The receiver includes a multilevel Bahl-Cocke-Jelinek-Raviv (BCJR) equalizer configured to receive channel samples of an input signal, partially mitigate fiber non-linearities, and provide symbol reliabilities. The receiver further includes a bit probabilities module coupled to the BCJR equalizer configured to calculate soft bit reliabilities from the symbol reliabilities. The receiver also includes one or more low-density parity-check (LDPC) decoders coupled to the bit probabilities module and the BCJR equalizer, configured to receive the soft bit reliabilities and output code words. The one or more LDPC decoders iteratively provide extrinsic soft information feedback to the BCJR equalizer to compensate for the fiber non-linearities.

摘要翻译： 提供了一种用于缓解多电平编码调制方案中更精细的非线性的接收机和方法。 接收机包括一个多层次Bahl-Cocke-Jelinek-Raviv（BCJR）均衡器，被配置为接收输入信号的信道样本，部分地减轻光纤非线性并提供符号可靠性。 接收机还包括耦合到BCJR均衡器的位概率模块，其被配置为从符号可靠性计算软比特可靠性。 接收机还包括耦合到比特概率模块和BCJR均衡器的一个或多个低密度奇偶校验（LDPC）解码器，被配置为接收软比特可靠性和输出码字。 一个或多个LDPC解码器向BCJR均衡器迭代地提供外部软信息反馈以补偿光纤非线性。

公开(公告)号：US20100027994A1

公开(公告)日：2010-02-04

申请号：US12183346

申请日：2008-07-31

申请人： Lei Xu ,  Yutaka Yano ,  Ting Wang ,  Junqiang Hu ,  Makoto Shibutani

发明人： Lei Xu ,  Yutaka Yano ,  Ting Wang ,  Junqiang Hu ,  Makoto Shibutani

IPC分类号： H04J14/00

CPC分类号： H04J14/0298 ,  H04B10/548 ,  H04L5/12 ,  H04L27/2614 ,  H04L27/2627 ,  H04L27/2697

摘要： A method includes generating an optical orthogonal frequency division multiplexing OFDM signal with in-phase and quadrature-phase components; varying an RF carrier according to the in-phase and quadrature-phase components; and modulating a phase of a lightwave carrier according to the varied RF carrier to generate an optical OFDM signal with equalized amplitude.

摘要翻译： 一种方法包括产生具有同相和正交相分量的光正交频分复用OFDM信号; 根据同相和正交相分量改变RF载波; 以及根据变化的RF载波调制光波载波的相位以产生具有相等振幅的光OFDM信号。

公开(公告)号：US20090245810A1

公开(公告)日：2009-10-01

申请号：US12054763

申请日：2008-03-25

申请人： Yue-Kai Huang ,  Ting Wang ,  Lei Xu

发明人： Yue-Kai Huang ,  Ting Wang ,  Lei Xu

IPC分类号： H04B10/04 ,  H04B10/12

CPC分类号： H04B10/25137 ,  H04B10/2575

摘要： In an optical transmission system, data is transmitted via an optical beam modulated with an arbitrary waveform. The optical beam is transmitted through at least one optical element. Transmission through at least one optical element degrades the signal quality of the initial optical beam. The signal characteristics of at least one optical beam at the output of least one optical element are used as feedback to shape the arbitrary waveform to improve signal characteristics. An arbitrary waveform may be used to compensate signal degradation caused by a multiplexer/demultiplexer in a wavelength division multiplex system.

摘要翻译： 在光传输系统中，通过任意波形调制的光束发送数据。 光束通过至少一个光学元件透射。 通过至少一个光学元件的透射降低了初始光束的信号质量。 在至少一个光学元件的输出处的至少一个光束的信号特性被用作反馈以形成任意波形以改善信号特性。 可以使用任意波形来补偿由波分多路复用系统中的多路复用器/解复用器引起的信号劣化。