公开(公告)号：US08774574B2

公开(公告)日：2014-07-08

申请号：US13477341

申请日：2012-05-22

申请人： Chongjin Xie ,  Roland Ryf

发明人： Chongjin Xie ,  Roland Ryf

IPC分类号： G02B6/26 ,  H04B10/13

CPC分类号： H04B10/071 ,  G02B6/0288 ,  H04B10/2581

摘要： An apparatus includes an N×1 spatial mode multiplexer, an optical source and an optical receiver. The spatial mode multiplexer has N input ports and an output port end-couplable to a multimode optical fiber. The multiplexer is configured to preferentially couple light between individual ones of the input ports and corresponding spatial optical modes of the multimode optical fiber. The optical source is connected to a first one of the input ports to launch an optical probe pulse into the fiber. The optical receiver is connected to electrically analyze an optical signal backscattered from the multimode optical fiber and output by a second one of the input ports in response to the launch of the optical probe pulse into the fiber.

摘要翻译： 一种装置包括N×1空间模式多路复用器，光源和光接收器。 空间模式多路复用器具有N个输入端口和与多模光纤端口可耦合的输出端口。 多路复用器被配置为优先耦合各个输入端口之间的光以及多模光纤的对应的空间光学模式。 光源连接到第一个输入端口，以将光学探针脉冲发射到光纤中。 光接收器被连接以响应于将光学探针脉冲发射到光纤中而电耦合从多模光纤反向散射的光信号并由第二输入端口输出。

公开(公告)号：US20130315532A1

公开(公告)日：2013-11-28

申请号：US13477341

申请日：2012-05-22

申请人： Chongjin Xie ,  Roland Ryf

发明人： Chongjin Xie ,  Roland Ryf

IPC分类号： G02B6/26

CPC分类号： H04B10/071 ,  G02B6/0288 ,  H04B10/2581

摘要： An apparatus includes an N×1 spatial mode multiplexer, an optical source and an optical receiver. The spatial mode multiplexer has N input ports and an output port end-couplable to a multimode optical fiber. The multiplexer is configured to preferentially couple light between individual ones of the input ports and corresponding spatial optical modes of the multimode optical fiber. The optical source is connected to a first one of the input ports to launch an optical probe pulse into the fiber. The optical receiver is connected to electrically analyze an optical signal backscattered from the multimode optical fiber and output by a second one of the input ports in response to the launch of the optical probe pulse into the fiber.

摘要翻译： 一种装置包括N×1空间模式多路复用器，光源和光接收器。 空间模式多路复用器具有N个输入端口和与多模光纤端口可耦合的输出端口。 多路复用器被配置为优先耦合各个输入端口之间的光以及多模光纤的对应的空间光学模式。 光源连接到第一个输入端口，以将光学探针脉冲发射到光纤中。 光接收器被连接以响应于将光学探针脉冲发射到光纤中而电耦合从多模光纤反向散射的光信号并由第二输入端口输出。

公开(公告)号：US20140079394A1

公开(公告)日：2014-03-20

申请号：US13632094

申请日：2012-09-30

申请人： Chongjin Xie ,  Luis Salamanca

发明人： Chongjin Xie ,  Luis Salamanca

IPC分类号： H04J14/06 ,  H04B10/04

CPC分类号： H04B10/532 ,  H04B10/5053 ,  H04B10/5055

摘要： An apparatus comprises a coherent optical transmitter. The coherent optical transmitter comprises a first modulator for generating a first polarization, a second modulator for generating a second polarization, and a symbol interleaver configured to receive a first symbol stream intended to be transmitted on a first polarization and a second symbol stream intended to be transmitted on a second polarization, to direct one portion of symbols of the first symbol stream to the first modulator for modulation onto the first polarization and another portion of the symbols of the first symbol stream to the second modulator for modulation onto the second polarization, and to direct one portion of symbols of the second symbol stream to the first modulator for modulation onto the first polarization and another portion of the symbols of the second symbol stream to the second modulator for modulation onto the second polarization.

摘要翻译： 一种装置包括相干光发射机。 相干光发射机包括用于产生第一极化的第一调制器，用于产生第二极化的第二调制器和被配置为接收旨在在第一偏振上传输的第一符号流的符号交织器和旨在被发送的第二符号流的第一符号流 在第二偏振上传输，以将第一符号流的符号的一部分引导到第一调制器，以调制到第一符号流的第一偏振和第一符号流的符号的另一部分到第二调制器，以调制到第二偏振上，以及 将第二符号流的符号的一部分引导到第一调制器，用于调制到第二偏振上的第一偏振和第二符号流的符号的另一部分到第二调制器以调制到第二偏振上。

公开(公告)号：US20110255879A1

公开(公告)日：2011-10-20

申请号：US12762127

申请日：2010-04-16

申请人： Chongjin Xie ,  René-Jean Essiambre

发明人： Chongjin Xie ,  René-Jean Essiambre

IPC分类号： H04B10/06

CPC分类号： H04B10/2572 ,  H04B10/2513 ,  H04B10/2543 ,  H04B10/60 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6162

摘要： Embodiments for optical communication are provided in which a receiver includes a digital signal processor configured to process a digital form of an input signal. In one embodiment, the digital signal processor includes a first electronic chromatic dispersion compensation module for compensating the digital form of the input signal, at least one nonlinearity compensation stage for serially compensating an output of the electronic chromatic dispersion compensation module; and a second electronic chromatic dispersion compensation module for compensating an output of the at least one nonlinearity compensation stage.

摘要翻译： 提供了用于光通信的实施例，其中接收机包括被配置为处理数字形式的输入信号的数字信号处理器。 在一个实施例中，数字信号处理器包括用于补偿输入信号的数字形式的第一电子色散补偿模块，用于串行补偿电子色散补偿模块的输出的至少一个非线性补偿级; 以及用于补偿所述至少一个非线性补偿级的输出的第二电子色散补偿模块。

公开(公告)号：US20110142449A1

公开(公告)日：2011-06-16

申请号：US12635129

申请日：2009-12-10

申请人： Chongjin Xie

发明人： Chongjin Xie

IPC分类号： H04J14/06 ,  H04B10/06

CPC分类号： H04J14/06 ,  H04B10/60 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6162

摘要： The singularity problem of the constant modulus algorithm (CMA) equalizer may be overcome by implementing the CMA equalizer as a two-stage equalizer, with the first stage being a modified version of a CMA equalizer and the second stage being a conventional CMA equalizer. The first stage may be made up of four sub-equalizers, of which only two of the sub-equalizers are independent, i.e., uncorrelated to each other. This first stage equalizer may compensate for PMD. The second stage equalizer is a conventional CMA equalizer made up of four sub-equalizers that are adjusted independently. This second stage equalizer may compensate for polarization-dependent loss (PDL) and any residual CD that is not fully compensated for by a CD compensator before the two-stage equalizer. Advantageously, as the determinant of the first stage never approaches zero, the singularity problem of a conventional CMA single-stage-only equalizer is avoided by the two-stage equalizer.

摘要翻译： 恒模算法（CMA）均衡器的奇异性问题可以通过将CMA均衡器实现为两级均衡器来克服，其中第一级是CMA均衡器的修改版本，第二级是常规CMA均衡器。 第一级可以由四个子均衡器组成，其中只有两个子均衡器是独立的，即彼此不相关。 该第一级均衡器可以补偿PMD。 第二级均衡器是由独立调整的四个子均衡器组成的常规CMA均衡器。 该第二级均衡器可补偿在两级均衡器之前由CD补偿器未完全补偿的偏振相关损耗（PDL）和任何残留CD。 有利地，由于第一级的决定因素从不接近零，所以通过两级均衡器来避免常规CMA单级均衡器的奇异性问题。

公开(公告)号：US07764423B2

公开(公告)日：2010-07-27

申请号：US12259389

申请日：2008-10-28

申请人： Colin J. McKinstrie ,  Chongjin Xie

发明人： Colin J. McKinstrie ,  Chongjin Xie

IPC分类号： G02F1/35 ,  H04B10/00

CPC分类号： G02F1/395 ,  G02F1/3536

摘要： A two-pump optical parametric device (OPD) having a nonlinear birefringent fiber, in which various four-wave mixing (FWM) processes can occur. The OPD applies, to the nonlinear birefringent fiber, two pump waves, each polarized at about 45 degrees with respect to a birefringence axis of the fiber, and a polarized input signal. A relevant FWM process couples the pump waves and the signal to cause the fiber to generate a desired output signal. In one configuration, the relevant FWM process is inverse modulational interaction, which causes the desired output signal to be generated through amplification or attenuation of the input signal. In another configuration, the relevant FWM process is phase conjugation, which causes the desired output signal to be generated through amplification of the input signal. In yet another configuration, the relevant FWM process is Bragg scattering, which causes the desired output signal to be generated as a corresponding idler signal.

摘要翻译： 具有非线性双折射光纤的双泵光参量装置（OPD），其中可发生各种四波混频（FWM）处理。 OPD对非线性双折射光纤应用两个泵浦波，每个泵波相对于光纤的双折射轴以约45度偏振，并且偏振输入信号。 相关的FWM过程耦合泵浦波和信号以使光纤产生期望的输出信号。 在一种配置中，相关的FWM过程是反向调制交互，这导致通过输入信号的放大或衰减来产生期望的输出信号。 在另一种配置中，相关的FWM过程是相位共轭，其通过放大输入信号来产生期望的输出信号。 在另一个配置中，相关的FWM过程是布拉格散射，其使得期望的输出信号被产生为相应的惰轮信号。

公开(公告)号：US20050185969A1

公开(公告)日：2005-08-25

申请号：US10782231

申请日：2004-02-19

申请人： Lothar Benedict Moeller ,  Chongjin Xie

发明人： Lothar Benedict Moeller ,  Chongjin Xie

IPC分类号： H04B10/04 ,  H04B10/00 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04B10/158 ,  H04L25/497

CPC分类号： H04B10/695 ,  H04L25/497

摘要： An optical receiver adapted to apply multiple-sampling processing to an optical duobinary signal received over a transmission link in an optical communication system. In one embodiment, the receiver has an optical-to-electrical signal converter coupled to a decoder adapted to process an electrical signal generated by the converter to generate a bit sequence corresponding to the optical signal. To generate a bit value, the decoder first obtains two or more bit estimate values by sampling the electrical signal within a corresponding signaling interval two or more times. The decoder then applies a logical function to the bit estimate values, which produces the corresponding bit value for the bit sequence. Advantageously, embodiments of the present invention improve overall back-to-back (i.e., source-to-destination) system performance, e.g., by reducing the number of decoding errors associated with timing jitter and/or spontaneous beat noise in the received optical signal.

摘要翻译： 一种光接收器，适于对通过光通信系统中的传输链路接收的光双二进制信号应用多采样处理。 在一个实施例中，接收机具有耦合到解码器的光电信号转换器，其适于处理由转换器产生的电信号以产生对应于光信号的比特序列。 为了产生位值，解码器首先通过在相应的信令间隔内对两个或更多次的电信号进行采样来获得两个或更多个比特估计值。 然后，解码器将逻辑功能应用于比特估计值，其产生比特序列的相应比特值。 有利地，本发明的实施例通过减少与接收到的光信号中的定时抖动和/或自发性差拍噪声相关联的解码错误的数量来改进整体背靠背（即，源到目的地）的系统性能 。

公开(公告)号：US08849130B2

公开(公告)日：2014-09-30

申请号：US13537467

申请日：2012-06-29

申请人： Chongjin Xie ,  Peter J. Winzer

发明人： Chongjin Xie ,  Peter J. Winzer

IPC分类号： H04B10/00 ,  H04B10/61

CPC分类号： H04B10/611 ,  H04B10/616

摘要： One coherent optical receiver includes a 3×3 coupler for receiving a signal and a local oscillator into a first and a third input port respectively, and three detectors for detecting a respective output of the coupler to generate corresponding first, second and third detected signals. A detected signal is filtered by an Alternating Current (AC) coupler to generate a respective first, second or third filtered signal. An adder adds the first, the second and the third filtered signals to determine a directly detected signal term. A first subtractor subtracts the directly detected signal term from the first filtered signal to determine an in-phase signal. A second subtractor subtracts the directly detected signal term from the third filtered signal to determine a quadrature signal. A digital signal processor processes the in-phase signal and the quadrature signal to recover the optical signal.

摘要翻译： 一个相干光接收机包括一个3×3耦合器，用于分别将信号和本地振荡器接收到第一和第三输入端口，以及三个检测器，用于检测耦合器的相应输出以产生对应的第一，第二和第三检测信号。 检测信号由交流电耦合器滤波以产生相应的第一，第二或第三滤波信号。 加法器将第一，第二和第三滤波信号相加以确定直接检测的信号项。 第一减法器从第一滤波信号中减去直接检测的信号项，以确定同相信号。 第二个减法器从第三个滤波信号中减去直接检测的信号项，以确定正交信号。 数字信号处理器处理同相信号和正交信号以恢复光信号。

公开(公告)号：US20110280587A1

公开(公告)日：2011-11-17

申请号：US12947358

申请日：2010-11-16

申请人： Chongjin Xie

发明人： Chongjin Xie

IPC分类号： H04B10/06

CPC分类号： H04B10/2569 ,  H04B10/671

摘要： A self-polarization diversity technique to combat PMD in a direct-detection optical OFDM system. This technique does not require any dynamic polarization control, and can simultaneous compensate PMD in a WDM system with one device. Simulation results show that this technique virtually completely eliminates the PMD impairments in direct-detection optical OFDM systems.

摘要翻译： 一种自偏振分集技术，用于在直接检测光OFDM系统中对抗PMD。 该技术不需要任何动态极化控制，并且可以使用一个器件同时补偿WDM系统中的PMD。 仿真结果表明，该技术实际上完全消除了直接检测光OFDM系统中的PMD损伤。

公开(公告)号：US20110052196A1

公开(公告)日：2011-03-03

申请号：US12583868

申请日：2009-08-27

申请人： Alan H. Gnauck ,  Chongjin Xie

发明人： Alan H. Gnauck ,  Chongjin Xie

IPC分类号： H04B10/00 ,  H04B10/06 ,  H04J14/02

CPC分类号： H04B10/50 ,  H04B10/677

摘要： System, apparatus and methods are provided for optical communication which tolerates the tight filtering effects from concatenation of reconfigurable optical add drop multiplexers (ROADMs). An exemplary system includes a receiver configured to receive a Narrow-Band Differential-Phase-Shift-Keyed (NB-DPSK) optical signal. The receiver includes a Delay Line Interferometer (DLI) with a path length difference of less than approximately one bit period and a detector for detecting DLI output to form an electrical signal. The bandwidth of the NB-DPSK optical signal is less than approximately one-half of a first bit rate of a transmitter from which the NB-DPSK optical signal is received. The electrical signal is processed to decode transmitted data. A corresponding transmitter amplifies a first input signal having a first bit rate; and drives a DPSK modulator after amplification to generate the NB-DPSK optical signal, which has a bandwidth less than approximately one-half of the first bit rate.

摘要翻译： 提供了用于光通信的系统，装置和方法，其容忍可重新配置的光分插复用器（ROADM）的级联中的紧密滤波效应。 示例性系统包括被配置为接收窄带差分相移键控（NB-DPSK）光信号的接收机。 接收机包括具有小于大约一个比特周期的路径长度差的延迟线干涉仪（DLI）和用于检测DLI输出以形成电信号的检测器。 NB-DPSK光信号的带宽小于接收NB-DPSK光信号的发射机的第一比特率的大约一半。 处理电信号以解码发送的数据。 对应的发射机放大具有第一比特率的第一输入信号; 并且在放大后驱动DPSK调制器以产生具有小于第一比特率的大约一半的带宽的NB-DPSK光信号。