公开(公告)号：US5677780A

公开(公告)日：1997-10-14

申请号：US524308

申请日：1995-09-06

申请人： Roeland Johannes Marie Wilhelm Nuyts

发明人： Roeland Johannes Marie Wilhelm Nuyts

IPC分类号： H04B10/18 ,  H04B10/12

CPC分类号： H04B10/25253 ,  H04B10/255

摘要： The self-phase modulation (SPM) effect in a dispersion compensating fiber (DCF) segment of an optical fiber transmission system is used to reduce the required length of the DCF segment needed to compensate the chromatic dispersion of a single mode fiber (SMF) segment of the system. It was determined that the length of the DCF segment at which the widest opening of the electrical eye diagram margin occurs, for a given optical input power to the DCF segment, decreases with increasing optical input power to the DCF segment. Increasing the optical input power to and reducing the length of the DCF segment thus both improves bit error rate of the system and reduces the cost for compensating for dispersion.

摘要翻译： 使用光纤传输系统的色散补偿光纤（DCF）段中的自相位调制（SPM）效应来减少补偿单模光纤（SMF）段的色散所需的DCF段的所需长度 的系统。 确定了对于DCF段的给定光输入功率发生电眼图余量最宽开度的DCF段的长度随着对DCF段的光输入功率的增加而减小。 增加光输入功率并减小DCF段的长度，从而提高了系统的误码率，并降低了补偿色散的成本。

公开(公告)号：US5612807A

公开(公告)日：1997-03-18

申请号：US425613

申请日：1995-04-20

申请人： George Ishikawa ,  Hideyuki Miyata ,  Hiroshi Onaka ,  Motoyoshi Sekiya ,  Kazue Otsuka

发明人： George Ishikawa ,  Hideyuki Miyata ,  Hiroshi Onaka ,  Motoyoshi Sekiya ,  Kazue Otsuka

IPC分类号： H04J14/00 ,  G02B6/34 ,  H04B10/2507 ,  H04B10/2525 ,  H04B10/255 ,  H04B10/2563 ,  H04B10/299 ,  H04J14/02 ,  H04B10/00

CPC分类号： G02B6/29377 ,  G02B6/4215 ,  H04B10/25133 ,  H04B10/2525 ,  H04B10/25253 ,  H04B10/255 ,  H04B10/2563 ,  H04J14/0224 ,  H04B2210/252 ,  H04B2210/254 ,  H04B2210/258 ,  H04J14/02

摘要： An optical wavelength multiplex transmission method uses a band around a zero dispersion wavelength of an optical fiber to compensate for waveform degradation, which is produced by a synergetic effect of self phase modulation and chromatic dispersion, to increase transmission distance and transmission rate in optical systems. The optical dispersion compensation method is performed in an optical system including a transmitter, a repeater and a receiver, which collectively transmit and receive optical information along the optical fiber. Light is transmitted within a transmissible band which is defined by an allowable dispersion value determined from a synergetic effect of self phase modulation and group velocity dispersion in the optical fiber. The transmissible band is set on a shorter wavelength side than a shorter wavelength end .lambda..theta.-.DELTA..lambda..theta. or on a longer wavelength side than a longer wavelength end .lambda..theta.+.DELTA..lambda..theta. of the zero-dispersion wavelength deviation range of the optical fiber. The zero dispersion wavelength .DELTA..theta. the optical fiber is shifted to apparently arranged the signal light into the transmissible band to compensate for the dispersion amount of the optical transmission system.

摘要翻译： 光波长复用传输方法使用光纤的零色散波长附近的频带来补偿由自相位调制和色散的协同效应产生的波形劣化，以增加光学系统中的传输距离和传输速率。 光学色散补偿方法在包括发射机，中继器和接收机的光学系统中执行，该光学系统共同地沿光纤发送和接收光学信息。 光在透射带内传输，其由通过光纤中的自相位调制和群速度色散的协同效应确定的容许色散值限定。 透射带设置在比较短波长端λθ-ΔTATAθ较短的波长侧，或者在比光纤的零色散波长偏差范围的较长波长端λθ+ΔTATAλθ更长的波长侧 。 光纤的零色散波长DELTAθ被移位以将信号光明显地布置到透射带中以补偿光传输系统的色散量。

公开(公告)号：US5587830A

公开(公告)日：1996-12-24

申请号：US69952

申请日：1993-05-28

申请人： Andrew R. Chraplyvy ,  Robert W. Tkach

发明人： Andrew R. Chraplyvy ,  Robert W. Tkach

IPC分类号： H04J14/00 ,  G02B6/02 ,  H04B10/02 ,  H04B10/18 ,  H04J14/02 ,  H04B10/12 ,  G02B6/10 ,  G02B6/28

CPC分类号： H04B10/2525 ,  H04B10/255 ,  H04B10/2563

摘要： A high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.

摘要翻译： 具有波分复用功能的大容量光纤网络。 考虑的系统可以利用超过100公里的跨距，跨度内的信号放大，并提供多达多达千兆位/秒的多路复用通道。

公开(公告)号：US11846182B2

公开(公告)日：2023-12-19

申请号：US17964585

申请日：2022-10-12

申请人： Baker Hughes Oilfield Operations LLC

发明人： John-Peter Van Zelm ,  Andy Hawthorn

IPC分类号： E21B47/16 ,  E21B47/18 ,  H04B1/00 ,  E21B47/14 ,  E21B47/12 ,  E21B47/135 ,  H04B10/255

CPC分类号： E21B47/16 ,  E21B47/135 ,  E21B47/18 ,  H04B1/005 ,  H04B10/255

摘要： A hybrid telemetry system includes a plurality of telemetry networks configured to communicate a modulated signal representing digital data along adjoining sections of a pipe string. The plurality of telemetry networks may each be optimized or particularly suitable for the configuration of the pipe string, the well, and/or the environment of the well occurring in each of the adjoining sections. Some of the plurality of telemetry networks may overlap to provide redundancy of the communication of the digital data.

公开(公告)号：US20180343078A1

公开(公告)日：2018-11-29

申请号：US15796393

申请日：2017-10-27

申请人： Kim B. Roberts ,  James Harley ,  Qunbi Zhuge ,  Michael Andrew Reimer ,  Maurice O'Sullivan

发明人： Kim B. Roberts ,  James Harley ,  Qunbi Zhuge ,  Michael Andrew Reimer ,  Maurice O'Sullivan

IPC分类号： H04J14/02 ,  H04B10/079 ,  H04Q11/00 ,  H04B10/58

CPC分类号： H04J14/0221 ,  H04B10/0793 ,  H04B10/07955 ,  H04B10/2543 ,  H04B10/255 ,  H04B10/2557 ,  H04B10/58 ,  H04B2210/254 ,  H04J14/0275 ,  H04Q11/0066 ,  H04Q2011/0041 ,  H04Q2011/0083

摘要： Multiple receivers are comprised in a flexible coherent transceiver of a multi-span optical fiber network. Each of the multiple receivers is operative to handle communications on a respective channel. The multiple receivers measure optical characteristics. For each of the multiple receivers, the optical characteristics include optical nonlinear interactions on the respective channel, the optical nonlinear interactions being at least partially dependent from one span to another span. An optical power of a signal on each of the multiple channels is adjusted as a function of the optical characteristics.

公开(公告)号：US20180138984A1

公开(公告)日：2018-05-17

申请号：US15852561

申请日：2017-12-22

申请人： HUAWEI TECHNOLOGIES CO., LTD.

发明人： Yuanyuan FANG ,  Liangchuan LI

IPC分类号： H04B10/516 ,  H04L27/20 ,  H04B10/255 ,  H04L27/26

CPC分类号： H04B10/5161 ,  H04B10/2543 ,  H04B10/255 ,  H04B10/548 ,  H04L5/0007 ,  H04L27/2096 ,  H04L27/2602 ,  H04L27/2628 ,  H04L27/2647

摘要： Embodiments of the present invention provide data transmission and receiving methods based on an orthogonal frequency division multiplexing technology, and an apparatus. According to the present invention, grouping and differential encoding are performed on multiple subcarriers, and further, carrier location adjustment is performed, so as to effectively improve non-linear tolerance of a multi-subcarrier system.

公开(公告)号：US20150086193A1

公开(公告)日：2015-03-26

申请号：US14032313

申请日：2013-09-20

申请人： Alcatel-Lucent USA Inc.

发明人： Xiang Liu ,  Peter J. Winzer ,  Chandrasekhar Sethumadhavan

IPC分类号： H04B10/58 ,  H04B10/2507 ,  H04B10/079

CPC分类号： H04B10/5563 ,  H04B10/2543 ,  H04B10/255 ,  H04B10/2557 ,  H04B10/2563 ,  H04B10/50 ,  H04B10/532 ,  H04B2210/254

摘要： An optical transmitter configured to mitigate the adverse effects of fiber nonlinearity by altering the transmitted constellation symbols based on specific nonlinear characteristics of a fiber-optic link over which the optical transmitter is configured to transmit and on an a priori estimate of the nonlinear component of the optical-signal distortion in that fiber-optic link. In an example embodiment, each constellation symbol is altered by a respective perturbation amount determined using (i) a calculated or measured nonlinear transfer function corresponding to the fiber-optic link and (ii) a set of neighboring constellation symbols that are expected to contribute to the nonlinear distortion of the optical signal carrying the present constellation symbol due to the fiber nonlinearity. In various embodiments, different appropriate perturbation amounts can be selected to approximately pre-compensate nonlinear distortions caused by various nonlinear optical effects, such as four-wave mixing, etc.

摘要翻译： 一种光发射机，被配置为通过基于光发射机被配置为传输的光纤链路的特定非线性特性改变所发送的星座符号来减轻光纤非线性的不利影响，并且基于对该发射器的非线性分量的先验估计 光纤链路中的光信号失真。 在一个示例实施例中，每个星座符号被改变为相应的扰动量，该扰动量使用（i）对应于光纤链路的计算或测量的非线性传递函数确定，以及（ii）一组相邻的星座符号， 由于光纤非线性，携带当前星座符号的光信号的非线性失真。 在各种实施例中，可以选择不同的适当扰动量来大致预补偿由诸如四波混频等各种非线性光学效应引起的非线性失真。

公开(公告)号：US20120263471A1

公开(公告)日：2012-10-18

申请号：US13513751

申请日：2010-12-03

申请人： Fred Buchali ,  Axel Klekamp

发明人： Fred Buchali ,  Axel Klekamp

IPC分类号： H04J14/00 ,  H04J14/02

CPC分类号： H04B10/255 ,  H04B10/548 ,  H04L1/08 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0087 ,  H04L25/03866 ,  H04L27/2628 ,  H04L27/265

摘要： The present invention provides a method and system for transmitting data over an optical channel using OFDM with a variable transmission rate. Such method and system feeds an essentially constant transmission power over a predetermined OFDM bandwidth into the optical channel. In an embodiment, at least two OFDM subcarriers may be modulated with signal information derived from a single word of an OFDM symbol. Further thereto, the frequency spacing between the transmitted OFDM subcarriers may be changed.

摘要翻译： 本发明提供了一种利用可变传输速率的OFDM通过光信道发送数据的方法和系统。 这种方法和系统将预定的OFDM带宽上的基本上恒定的发射功率馈送到光信道。 在一个实施例中，可以使用从OFDM符号的单个字导出的信号信息来调制至少两个OFDM子载波。 此外，可以改变发送的OFDM子载波之间的频率间隔。

公开(公告)号：US20100104284A1

公开(公告)日：2010-04-29

申请号：US12288794

申请日：2008-10-23

申请人： Xiang Liu ,  Robert William Tkach

发明人： Xiang Liu ,  Robert William Tkach

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  H04B10/255

摘要： System, apparatus and method of optical communication are provided for performing digital compensation of the self-phase modulation (SPM) effect experienced by a polarization-division multiplexed (PDM) orthogonal frequency-division multiplexed (OFDM) signal in fiber transmission by compensating a complex digital waveform representing one orthogonal polarization component of the optical PDM-OFDM signal based on both digital waveforms representing two orthogonal polarization components of the PDM-OFDM signal. The compensation of the digital waveform may be further based on an anticipated mean total nonlinear phase shift experienced by the signal during fiber transmission due to SPM. The compensation may be divided into pre-compensation at the PDM-OFDM transmitter and post-compensation at the PDM-OFDM receiver. The fiber transmission link preferably includes a pre-dispersion compensation module, distributed inline dispersion compensation modules, and a post-dispersion compensation module arranged in a judiciously chosen manner.

摘要翻译： 提供光通信的系统，装置和方法，用于对光纤传输中的偏振分复用（PDM）正交频分复用（OFDM）信号所经历的自相位调制（SPM）效应进行数字补偿， 基于表示PDM-OFDM信号的两个正交偏振分量的两个数字波形，表示光学PDM-OFDM信号的一个正交偏振分量的数字波形。 数字波形的补偿可以进一步基于由于SPM而在光纤传输期间由信号所经历的预期平均总非线性相移。 补偿可以分为PDM-OFDM发射机的预补偿和PDM-OFDM接收机的后补偿。 纤维传输链路优选地包括预分散补偿模块，分布式在线色散补偿模块和以明智选择的方式布置的后分散补偿模块。

公开(公告)号：US07692849B2

公开(公告)日：2010-04-06

申请号：US11822841

申请日：2007-07-10

申请人： Norifumi Shukunami ,  Tatsuya Tsuzuki

发明人： Norifumi Shukunami ,  Tatsuya Tsuzuki

IPC分类号： H04B10/17 ,  H04B10/12

CPC分类号： G01M11/33 ,  G01M11/319 ,  H04B10/255

摘要： In an optical amplifier of the present invention, an input light is supplied to one end of an optical fiber connected to an output port, and the power of a light in an opposite direction which is input to the output port from the one end of the optical fiber, is measured, thereby obtaining a stimulated Brillouin scattering (SBS) occurrence threshold in the optical fiber based on the measurement result. Then, using the SBS occurrence threshold, a relation been the input light power and an occurrence amount of the self phase modulation (SPM) or the like in the optical fiber is obtained to be reflected on a control of the optical amplifier, so that an occurrence of the SPM or the like in the optical fiber is suppressed. As a result, it becomes possible to accurately measure, with a simple configuration, the nonlinear optical properties of the optical fiber actually connected to the output port of the optical amplifier, so that the optical S/N ratio degradation due to a nonlinear optical effect can be effectively suppressed.

摘要翻译： 在本发明的光放大器中，输入光被提供给连接到输出端口的光纤的一端，并且从与所述输出端口的一端输入到输出端口的相反方向的光的功率 光纤，从而基于测量结果在光纤中获得受激布里渊散射（SBS）发生阈值。 然后，使用SBS发生阈值，获得输入光功率和光纤中的自相位调制（SPM）等的发生量的关系，以反映在光放大器的控制上，使得 抑制光纤中的SPM等的发生。 结果，可以以简单的结构精确地测量实际连接到光放大器的输出端口的光纤的非线性光学特性，使得由于非线性光学效应导致的光S / N比劣化 可以有效地抑制。