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公开(公告)号：US07352971B2
公开(公告)日：2008-04-01
申请号：US10209904
申请日：2002-08-02
IPC分类号： H04B10/12
CPC分类号： H04B10/2569
摘要： A method and system is provided for compensating polarization mode dispersion (PMD) in an optical communications system includes a controller designed to control a broadband PMD compensator to differentially delay light at each one of a plurality of selected wavelengths. At least one of the selected wavelengths lies between an adjacent pair of channel wavelengths of the optical communications system. A performance parameter value indicative of PMD is measured at each channel wavelength of the optical communications system. An estimated performance parameter value is then calculated at each selected wavelength, and an error function calculated as a function of wavelength based on the estimated performance parameter values. The broadband PMD compensator is then controlled to minimize the value of the error function.
摘要翻译： 提供了一种用于补偿光通信系统中的偏振模色散（PMD）的方法和系统，包括设计成控制宽带PMD补偿器差分延迟多个选定波长中的每一个处的光的控制器。 所选择的波长中的至少一个位于光通信系统的相邻的一对通道波长之间。 在光通信系统的每个信道波长处测量指示PMD的性能参数值。 然后在每个选择的波长处计算估计的性能参数值，并且基于估计的性能参数值计算作为波长的函数的误差函数。 然后控制宽带PMD补偿器以最小化误差函数的值。
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2.发明授权公开(公告)号：US09559778B2
公开(公告)日：2017-01-31
申请号：US10531314
申请日：2003-07-11
IPC分类号： H04B10/516 , H04B10/50 , H04B10/2513 , H04B10/508
CPC分类号： H04B10/07951 , H04B10/07953 , H04B10/25137 , H04B10/505 , H04B10/50597 , H04B10/508 , H04B10/6161
摘要： Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. In preferred embodiments, compensation is implemented in the transmitter, using a look-up-table and digital-to-analog converter to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system.
摘要翻译： 施加在通过光通信系统传送的通信信号上的光色散通过调制电域中的通信信号来补偿。 确定基本上减轻色散的补偿功能。 然后使用补偿功能在电域中调制通信信号。 在优选实施例中，使用查找表和数模转换器来在发射机中实现补偿以产生电预失真信号。 然后，电预失真信号用于调制光源以产生用于通过光通信系统传输的相应的预失真光信号。
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公开(公告)号：US07155128B2
公开(公告)日：2006-12-26
申请号：US10014353
申请日：2001-12-14
IPC分类号： H04J14/02
CPC分类号： H04B10/2563 , H04J14/02
摘要： A method and system for reducing non-linear signal degradation effects of WDM optical signals exacerbated by highly correlated bit patterns of optical waveforms in neighboring optical channels. Embodiments include offsetting the transmission times of signals in neighboring channels, and applying different scrambling patterns to the respective data streams prior to transmission on neighboring optical channels.
摘要翻译： 一种用于减少WDM光信号的非线性信号劣化效应的方法和系统，其由相邻光信道中的光波形的高度相关位模式加剧。 实施例包括抵消相邻信道中的信号的传输时间，以及在相邻光信道上传输之前将各种数据流应用不同的加扰模式。
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公开(公告)号：US06473214B1
公开(公告)日：2002-10-29
申请号：US09283213
申请日：1999-04-01
IPC分类号： H04B1004
CPC分类号： H04L5/06 , H04L25/497 , H04L27/02
摘要： A binary signal is encoded to produce a three-level encoded signal having reduced bandwidth and small low frequency and d.c. components, e.g. using modified duobinary encoding, the encoded signal directly modulating a semiconductor laser to produce a frequency modulated optical signal, which is passed through an interference filter to provide two-state amplitude modulation from the three-state frequency modulation for direct recovery of the binary signal by an optical receiver, the interference filter providing constructive and destructive interference for frequencies corresponding to binary one and zero bits respectively. An array transmission system can be provided by combining multiple such frequency modulated optical signals, from multiple lasers with respective central frequencies and respective encoders for multiple binary signals, using an array waveguide which also serves as a channel frequency filter, with a single interference filter. Polarization modulation instead of frequency modulation, and external modulation of an optical signal from an optical source, are also described.
摘要翻译： 二进制信号被编码以产生具有减小的带宽和小的低频和直流的三电平编码信号。 组分，例如 使用修改的二进制编码，编码信号直接调制半导体激光器以产生调频光信号，该信号通过干涉滤波器从三态调制提供双态幅度调制，以通过以下方式直接恢复二进制信号： 光接收机，干扰滤波器分别为对应于二进制1和零位的频率提供建设性和相消干扰。 可以通过使用具有单个干涉滤波器的阵列波导来组合来自具有各自中心频率的多个激光器和多个二进制信号的相应编码器的多个这种频率调制光信号来提供阵列传输系统。 还描述了偏振调制而不是频率调制，以及来自光源的光信号的外部调制。
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公开(公告)号：US08594499B1
公开(公告)日：2013-11-26
申请号：US10389804
申请日：2003-03-18
IPC分类号： H04B10/071
CPC分类号： H04B10/073
摘要： Phase nonlinearities of an optical communications system are monitored by generating a test signal which includes a predetermined property that is uniquely associated with at least one phase nonlinearity of the optical communications system. The predetermined property of the test signal is then detected at a monitoring point of the optical communications system, and used to estimate the associated phase nonlinearity.
摘要翻译： 通过生成包括与光通信系统的至少一个相位非线性唯一相关联的预定属性的测试信号来监视光通信系统的相位非线性。 然后在光通信系统的监视点检测测试信号的预定属性，并用于估计相关的相位非线性。
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6.发明授权公开(公告)号：US07756421B2
公开(公告)日：2010-07-13
申请号：US10405236
申请日：2003-04-03
IPC分类号： H04B10/00
CPC分类号： H04B10/2543
摘要： Nonlinearity-induced signal distortions are compensated by processing an input communications signal, in the electrical domain prior to Electrical-to-optical conversion and transmission through an optical link of a communications system. According to the invention, a compensation operator is determined that substantially mitigates the nonlinearity-induced signal distortions imparted to an optical signal traversing the communications system. The input communications signal is then input to the compensation operator to generate a predistorted electrical signal. This predistorted electrical signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system. With this arrangement, arbitrary nonlinearity-induced signal distortions imparted by the optical link can be compensated in such a manner that a comparatively undistorted optical signal is obtained at the receiving end of the optical link.
摘要翻译： 在通过通信系统的光链路的电 - 光转换和传输之前，通过处理电域中的输入通信信号来补偿非线性引起的信号失真。 根据本发明，确定补偿算子，其基本上减轻施加到穿过通信系统的光信号的非线性引起的信号失真。 然后将输入通信信号输入到补偿操作器以产生预失真的电信号。 然后，该预失真的电信号用于调制光源以产生用于通过光通信系统传输的相应的预失真光信号。 通过这种布置，可以以在光链路的接收端获得相对不失真的光信号的方式来补偿由光链路赋予的任意非线性引起的信号失真。
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7.发明授权公开(公告)号：US07305183B2
公开(公告)日：2007-12-04
申请号：US09975985
申请日：2001-10-15
申请人： Kim B. Roberts , Giuseppe G. Bordogna , Riyaz R. Jamal , Douglas D. McGhan , Maurice S. O'Sullivan
发明人： Kim B. Roberts , Giuseppe G. Bordogna , Riyaz R. Jamal , Douglas D. McGhan , Maurice S. O'Sullivan
CPC分类号： H04B10/2572
摘要： A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical communications system. A polarization state of the signal is detected at a selected detection point downstream of the launch point. The PDE is evaluated using the predetermined initial polarization state and the detected polarization state.
摘要翻译： 一种方法和系统能够测量包括多个级联光学部件的光通信系统中的偏振相关损耗（PDL）。 具有预定初始极化状态的光信号被发射到光通信系统中。 在发射点下游的选择的检测点处检测信号的偏振状态。 使用预定的初始极化状态和检测到的偏振状态来评估PDE。
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8.发明授权公开(公告)号：US06687464B1
公开(公告)日：2004-02-03
申请号：US09481691
申请日：2000-01-12
IPC分类号： H04B1008
CPC分类号： H04B10/2503 , H04B10/079
摘要： An optical communications system is adapted for connection to an optical fiber link of an optical communications network. The system obtains a fiber identifier respecting the optical fiber link; a respective optimum setting of one or more parameters of the optical communications system; and adjusts a respective value of each parameter in accordance with the respective optimum setting. The fiber identifier can be obtained from a value of at least one fiber transmission property of the optical fiber link. The fiber transmission property value is used to search a look-up table of class definitions, each class definition including a respective class identifier and at least one corresponding characteristic transmission property value. A class identifier is selected as the fiber identifier from the class definition for which each characteristic transmission property value most closely matches a corresponding fiber transmission property value. Each class definition may also include an optimum setting for each parameter.
摘要翻译： 光通信系统适于连接到光通信网络的光纤链路。 该系统获得关于光纤链路的光纤标识符; 光通信系统的一个或多个参数的相应最佳设置; 并根据各自的最佳设定调整各参数的相应值。 可以从光纤链路的至少一个光纤传输特性的值获得光纤标识符。 光纤传输属性值用于搜索类定义的查找表，每个类定义包括相应的类标识符和至少一个对应的特征传输属性值。 从类别定义中选择类别标识符作为每个特征传输特性值与其对应的光纤传输属性值最匹配的类定义。 每个类定义也可以包括每个参数的最佳设置。
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公开(公告)号：US06493088B1
公开(公告)日：2002-12-10
申请号：US09411649
申请日：1999-10-04
IPC分类号： G01B902
CPC分类号： H04J14/02 , G01J9/02 , G01J2009/023 , G01J2009/0253 , H04B10/0795 , H04J14/0227 , H04J14/0276
摘要： The present invention provides a method and apparatus for monitoring optical signals with an expand frequency resolution. The invention permits high-resolution measurements of optical signal spectrums while retaining wide bandwidth operation through appropriate control circuitry. An interferometer having a periodic frequency response formed of equally spaced narrow-band peaks is used to sweep the entire signal spectrum. The interferometer frequency response is incrementally tuned in cycles so that each of its frequency response peaks cyclically scans a particular spectral band of the signal spectrum. During each cycle, the interferometer isolates multiple,spectrally resolved portions of the optical signal spectrum where each portion originates frog different spectral band. In this way, a high-resolution measurement of the entire signal spectrum can be obtained. The invention may be network protocol independent and can be incorporated into an optical spectrum analyzer or directly into any optical terminal. The invention can be used for signal spectrum monitoring applications including link quality monitoring (LQM) in optical communications networks to monitor various transmission parameters such as such as carrier wavelengths, optical signal-to-noise ratios (SNR), amplified spontaneous emissions (ASE), noise levels, optical non-linearities or other signal baseband information such as data rates and formats.
摘要翻译： 本发明提供一种以扩展频率分辨率监视光信号的方法和装置。 本发明允许光信号频谱的高分辨率测量，同时通过适当的控制电路保持宽带宽操作。 使用具有由等间隔的窄带峰值形成的周期性频率响应的干涉仪来扫描整个信号频谱。 干涉仪频率响应以周期递增调谐，使得其每个频率响应峰值对信号频谱的特定谱带进行循环扫描。 在每个周期期间，干涉仪隔离光信号频谱的多个光谱解析部分，其中每个部分起源于青蛙不同的光谱带。 以这种方式，可以获得整个信号频谱的高分辨率测量。 本发明可以是与网络协议无关的，并且可以并入到光谱分析仪中或直接并入任何光学终端。 本发明可用于信号频谱监测应用，包括光通信网络中的链路质量监测（LQM），以监测各种传输参数，例如载波波长，光信噪比（SNR），放大自发辐射（ASE） ，噪声电平，光学非线性或其他信号基带信息，如数据速率和格式。
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10.发明授权
公开(公告)号：US5892858A
公开(公告)日：1999-04-06
申请号：US827419
申请日：1997-03-27
申请人： Mazoud Vaziri , Maurice S. O'Sullivan , Terry W. B. Taraschuk , Alan Glen Solheim , Kim Byron Roberts
发明人： Mazoud Vaziri , Maurice S. O'Sullivan , Terry W. B. Taraschuk , Alan Glen Solheim , Kim Byron Roberts
IPC分类号： G02F1/01 , H03M5/16 , H03M5/18 , H04B10/00 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04B10/155 , H04L25/497 , G02B6/10
CPC分类号： H04B10/5055 , H03M5/18 , H04B10/505 , H04B10/5167
摘要： A method for encoding a binary input sequence x(0,1) to obtain a duobinary output sequence y(+1,0,-1) is provided. The duobinary coding technique always provides an output bit y.sub.k =0 when the corresponding bit x.sub.k =0; bits y.sub.k alternatively assume a logical level "+1" and "-1" whenever an input bit x.sub.k-1 =0 changes to x.sub.k =1, and the output bit y.sub.k maintains the logical level "+1" or "-1" whenever the corresponding bit x.sub.k maintains the logical level "1". A coding device for encoding a binary input sequence x(0,1) to a duobinary output sequence y(+1,0,-1) is also provided, comprising a D-type flip-flop for generating a binary switch signal. A first AND circuit receives the input sequence and the switch signal, and provides a first binary sequence a(0,1), while a second AND circuit receives the input sequence and the complement of the switch signal and provides a second binary sequence b(0,1). These first and second binary sequences are applied to a summer to obtain the output sequence y(+1,0,-1). A method for differentially driving a M-Z modulator using a virtual ground level is also provided, which reduces the peak-to-peak drive voltage by a factor of two.
摘要翻译： 提供了一种用于对二进制输入序列x（0,1）进行编码以获得双二进制输出序列y（+ 1,0，-1）的方法。 当对应的位xk = 0时，双向编码技术总是提供输出位yk = 0; 只要输入位xk-1 = 0改变为xk = 1，位yk或者假设逻辑电平“+1”和“-1”，并且输出位yk每当维持逻辑电平“+1”或“-1” 对应的位xk保持逻辑电平“1”。 还提供了用于将二进制输入序列x（0,1）编码到二进制输出序列y（+ 1,0，-1）的编码装置，包括用于产生二进制开关信号的D型触发器。 第一AND电路接收输入序列和开关信号，并提供第一二进制序列a（0,1），而第二AND电路接收输入序列和开关信号的补码，并提供第二二进制序列b（ 0,1）。 将这些第一和第二二进制序列应用于加法器以获得输出序列y（+ 1,0，-1）。 还提供了一种用于使用虚拟接地电平差分驱动M-Z调制器的方法，其将峰 - 峰驱动电压降低了二倍。
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