公开(公告)号：US07277647B2

公开(公告)日：2007-10-02

申请号：US10099105

申请日：2002-03-14

申请人： Douglas M Gill ,  Xiang Liu ,  Xing Wei

发明人： Douglas M Gill ,  Xiang Liu ,  Xing Wei

IPC分类号： H04B10/04

CPC分类号： H04B10/505 ,  H04B10/5053 ,  H04B10/5563

摘要： Minimum shift keying (MSK) is used as the coding scheme in a high bit rate optical transmission system, and the signal format is either RZ (return-to-zero) or NRZ (non-return-to-zero). The system can combine multiple individual channels with different wavelengths in a WDM or dense wavelength division multiplexed (DWDM) arrangement. Dispersion management can be provided using several techniques, such as quasi-linear transmissions or conventional RZ transmissions. At the transmitter, an optical MSK transmitter is used to modulate the phase of a stream of high bit rate (e.g., 40 Gbit/s) optical signals. Many such data streams can be combined in a wavelength division multiplexer and transmitted to a remote receiver, where the signal is wavelength division demultiplexed. The encoded data in each wavelength channel is then recovered by an MSK receiver, which may consist of a delay demodulator and a balanced detector.

摘要翻译： 最小移位键控（MSK）用作高比特率光传输系统中的编码方案，信号格式为RZ（归零）或NRZ（非归零）。 该系统可以在WDM或密集波分复用（DWDM）布置中组合具有不同波长的多个单独信道。 可以使用几种技术来提供色散管理，例如准线性传输或常规RZ传输。 在发射机处，使用光学MSK发射机来调制高比特率（例如40Gbit / s）光信号流的相位。 许多这样的数据流可以组合在波分多路复用器中并被发送到远程接收机，其中信号被波分解复用。 每个波长信道中的编码数据然后由MSK接收机恢复，MSK接收机可以由延迟解调器和平衡检测器组成。

公开(公告)号：US07277645B2

公开(公告)日：2007-10-02

申请号：US10099077

申请日：2002-03-14

申请人： Douglas M Gill ,  Xiang Liu ,  Xing Wei

发明人： Douglas M Gill ,  Xiang Liu ,  Xing Wei

IPC分类号： H04B10/04

CPC分类号： H04B10/2563 ,  G02B2006/12142 ,  G02B2006/12159 ,  G02F1/225

摘要： A 90 degree Alternate-Phase (AP) on-off keying (OOK) transmission format for high bit rate, long-haul optical transmission systems employing a chirped or a chirp-free pulse stream generated by a pulse generator (e.g., Mach Zehnder modulator) driven by mixing two electrical signals—one for intensity modulation and another for pulse modulation. These electrical signals may be two properly skewed sinusoidal electrical signals at half the desired data rate thereby generating a pulse stream in which the maximum optical phase modulation occurs at the intensity peak of each pulse and is 90 degrees out of phase with its nearest neighbors.

摘要翻译： 采用由脉冲发生器产生的啁啾或无啁啾脉冲流的高比特率，长途光传输系统的90度交替相位（AP）开关键控（OOK）传输格式（例如，Mach Zehnder调制器 ）通过混合两个电信号驱动，一个用于强度调制，另一个用于脉冲调制。 这些电信号可以是两倍于所需数据速率的两个正确偏斜的正弦电信号，从而产生脉冲流，其中最大光相位调制发生在每个脉冲的强度峰值处，并且与其最近的相邻部分相差90度。

公开(公告)号：US07362979B2

公开(公告)日：2008-04-22

申请号：US10355583

申请日：2003-01-31

申请人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

发明人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

IPC分类号： H04B10/12 ,  H04B10/04

CPC分类号： H04B10/508 ,  H04B10/505

摘要： An apparatus and method are provided for transmitting an optical duobinary signal using a low bandwidth modulator having a bandwidth of less than about 60% of the transmission bit rate of the transmitter. The modulator is adapted to provide low pass filtering for low pass filtered duobinary transmission in an optical fiber transmission system having residual dispersion.

摘要翻译： 提供一种装置和方法，用于使用具有小于发射机的传输比特率的约60％的带宽的低带宽调制器来发送光学双二进制信号。 调制器适于在具有残余色散的光纤传输系统中为低通滤波的双二进制传输提供低通滤波。

公开(公告)号：US07362980B2

公开(公告)日：2008-04-22

申请号：US10356203

申请日：2003-01-31

申请人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

发明人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

IPC分类号： H04B10/12 ,  H04B10/04

CPC分类号： H04B10/508 ,  H04B10/505

摘要： An optical duobinary transmission system and method are provided for transmitting optical duobinary signals across an optical transmission link having residual dispersion. The system includes a transmitter having a low bandwidth modulator, adapted to provide filtering for low pass filtered duobinary transmission. The transmission link is designed such that the residual dispersion of the transmission link substantially compensates for signal distortion from the transmitter.

摘要翻译： 提供了一种用于在具有残余色散的光传输链路上传输光双二进制信号的光双二进制传输系统和方法。 该系统包括具有低带宽调制器的发射机，适于对低通滤波的双二进制传输提供滤波。 传输链路被设计成使得传输链路的残余色散基本上补偿来自发射机的信号失真。

公开(公告)号：US06539131B1

公开(公告)日：2003-03-25

申请号：US09933644

申请日：2001-08-21

申请人： Douglas M. Gill ,  Xing Wei

发明人： Douglas M. Gill ,  Xing Wei

IPC分类号： G02F1295

CPC分类号： H04L27/2096 ,  G02F1/3136 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/5563 ,  H04L27/2014

摘要： The specification describes an optical modulator implemented with an MSK format. The modulator creates two separate pulse streams (one pulse stream comprising the odd bits and the other comprising the even bits of the data stream) using a 1-by-2 pulse generator. The modulator then uses electrooptic phase modulators to encode the odd and even numbered bits separately, and a 50/50 coupler to remix them.

摘要翻译： 本说明书描述了以MSK格式实现的光调制器。 调制器使用1×2脉冲发生器创建两个单独的脉冲流（包括奇数位的一个脉冲流，另一个包括数据流的偶数位）。 然后，调制器使用电光相位调制器分别编码奇数和偶数位，以及一个50/50耦合器来重新混合它们。

公开(公告)号：US09312964B2

公开(公告)日：2016-04-12

申请号：US11525786

申请日：2006-09-22

申请人： Xiang Liu ,  Xing Wei

发明人： Xiang Liu ,  Xing Wei

IPC分类号： H04B10/60 ,  H04B10/516 ,  H04B10/67

CPC分类号： H04B10/60 ,  H04B10/5161 ,  H04B10/677

摘要： A digital version of both amplitude and phase of a received optical is developed by employing direct differential detection in conjunction with digital signal processing. The signal is split into three copies. An intensity profile is conventionally obtained using one of the copies. Phase information is obtained by supplying each remaining copy to a respective one of a pair of optical delay interferometers that have orthogonal phase offsets, followed by respective balanced intensity detectors. The output of each of the balanced intensity detectors, and the intensity profile, are each converted to respective digital representations. Signal processing is used to develop the phase information from the digital representations of the output of the balanced intensity detector outputs.

摘要翻译： 通过采用与数字信号处理相结合的直接差分检测来开发接收光学的幅度和相位的数字版本。 信号分为三份。 通常使用其中一个副本来获得强度分布。 通过将每个剩余副本提供给具有正交相位偏移的一对光学延迟干涉仪中的相应一个，随后是相应的平衡强度检测器来获得相位信息。 每个平衡强度检测器的输出和强度分布都被转换成各自的数字表示。 信号处理用于从平衡强度检测器输出的输出的数字表示中开发相位信息。

公开(公告)号：US07613402B2

公开(公告)日：2009-11-03

申请号：US10730413

申请日：2003-12-08

申请人： Xiang Liu ,  Lothar Benedict Erhard Josef Moeller ,  Xing Wei ,  Chongjin Xie

发明人： Xiang Liu ,  Lothar Benedict Erhard Josef Moeller ,  Xing Wei ,  Chongjin Xie

IPC分类号： H04B10/06

CPC分类号： H04L25/068 ,  H04B10/69 ,  H04L7/042 ,  H04L25/4923

摘要： An optical receiver adapted to process 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. The decoder processes an electrical signal generated by the converter to generate a bit sequence corresponding to the optical signal. To generate a bit value, the decoder integrates the electrical signal using a sampling window and compares the integration result with a decision threshold value. In one configuration, the width of the sampling window and the decision threshold value are selected based on the eye diagram and noise distribution function, respectively, corresponding to the optical signal. Advantageously, embodiments of the present invention improve overall back-to-back (i.e., source-to-destination) system performance, e.g., by improving dispersion tolerance and/or reducing optical power corresponding to a selected bit error rate value.

摘要翻译： 一种适于处理在光通信系统中通过传输链路接收的光双二进制信号的光接收机。 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。 解码器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，解码器使用采样窗口对电信号进行积分，并将积分结果与判定阈值进行比较。 在一种配置中，分别基于对应于光信号的眼图和噪声分布函数来选择采样窗口的宽度和判定阈值。 有利地，本发明的实施例例如通过改善对应于所选位错误率值的色散容限和/或减少光功率来改进整体背靠背（即源到目的地）系统性能。

公开(公告)号：US20050123068A1

公开(公告)日：2005-06-09

申请号：US10730413

申请日：2003-12-08

申请人： Xiang Liu ,  Lothar Benedict Josef Moeller ,  Xing Wei ,  Chongjin Xie

发明人： Xiang Liu ,  Lothar Benedict Josef Moeller ,  Xing Wei ,  Chongjin Xie

IPC分类号： H04L25/497 ,  H03M5/18 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/142 ,  H04B10/152 ,  H04B10/155 ,  H04B10/158 ,  H04B10/26 ,  H04B10/28 ,  H04L7/04 ,  H04L25/06 ,  H04L25/49

CPC分类号： H04L25/068 ,  H04B10/69 ,  H04L7/042 ,  H04L25/4923

摘要： An optical receiver adapted to process 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. The decoder processes an electrical signal generated by the converter to generate a bit sequence corresponding to the optical signal. To generate a bit value, the decoder integrates the electrical signal using a sampling window and compares the integration result with a decision threshold value. In one configuration, the width of the sampling window and the decision threshold value are selected based on the eye diagram and noise distribution function, respectively, corresponding to the optical signal. Advantageously, embodiments of the present invention improve overall back-to-back (i.e., source-to-destination) system performance, e.g., by improving dispersion tolerance and/or reducing optical power corresponding to a selected bit error rate value.

摘要翻译： 一种适于处理在光通信系统中通过传输链路接收的光双二进制信号的光接收机。 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。 解码器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，解码器使用采样窗口对电信号进行积分，并将积分结果与判定阈值进行比较。 在一种配置中，分别基于对应于光信号的眼图和噪声分布函数来选择采样窗口的宽度和判定阈值。 有利地，本发明的实施例例如通过改善对应于所选位错误率值的色散容限和/或减少光功率来改进整体背靠背（即源到目的地）系统性能。

公开(公告)号：US08045862B2

公开(公告)日：2011-10-25

申请号：US10790434

申请日：2004-02-27

申请人： Xiang Liu ,  Yikai Su ,  Xing Wei

发明人： Xiang Liu ,  Yikai Su ,  Xing Wei

IPC分类号： H04B10/02

CPC分类号： H04B10/291 ,  H04B10/2914 ,  H04B2210/258

摘要： An optical amplification method and apparatus implemented using RZ-DPSK modulation or variants thereof and a deeply saturated semiconductor optical amplifier.

摘要翻译： 使用RZ-DPSK调制或其变体和深饱和半导体光放大器实现的光放大方法和装置。

公开(公告)号：US20080075472A1

公开(公告)日：2008-03-27

申请号：US11525786

申请日：2006-09-22

申请人： Xiang Liu ,  Xing Wei

发明人： Xiang Liu ,  Xing Wei

IPC分类号： H04B10/06

CPC分类号： H04B10/60 ,  H04B10/5161 ,  H04B10/677

摘要： A digital version of both amplitude and phase of a received optical is developed by employing direct differential detection in conjunction with digital signal processing. The signal is split into three copies. An intensity profile is conventionally obtained using one of the copies. Phase information is obtained by supplying each remaining copy to a respective one of a pair of optical delay interferometers that have orthogonal phase offsets, followed by respective balanced intensity detectors. The output of each of the balanced intensity detectors, and the intensity profile, are each converted to respective digital representations. Signal processing is used to develop the phase information from the digital representations of the output of the balanced intensity detector outputs.

摘要翻译： 通过采用与数字信号处理相结合的直接差分检测来开发接收光学的幅度和相位的数字版本。 信号分为三份。 通常使用其中一个副本来获得强度分布。 通过将每个剩余副本提供给具有正交相位偏移的一对光学延迟干涉仪中的相应一个，随后是相应的平衡强度检测器来获得相位信息。 每个平衡强度检测器的输出和强度分布都被转换成各自的数字表示。 信号处理用于从平衡强度检测器输出的输出的数字表示中开发相位信息。