公开(公告)号：US20060034618A1

公开(公告)日：2006-02-16

申请号：US10914989

申请日：2004-08-10

申请人： Young-Kai Chen ,  Ut-Va Koc ,  Andreas Leven

发明人： Young-Kai Chen ,  Ut-Va Koc ,  Andreas Leven

IPC分类号： H04B10/04

CPC分类号： H04B10/2513 ,  H04B10/2569

摘要： An adaptive optical parallel equalizer architecture is based on a controllable optical modulator device to realize an optical FIR (finite-impulse-response) filter including a plurality of coefficient taps in order to have independent control of each optical FIR filter coefficient. A unique adaptive opto-electronic LMS (least mean squares) process is utilized to generate an electronic error signal utilized to control the plurality of parallel tap coefficients of the optical parallel equalizer. The electronic error signal is used as the optimization criterion because the electronic signal after photo-detection is needed to achieve any measurable performance in terms of bit error rate (BER). In a specific embodiment, the controllable optical parallel FIR filter is realized by employing an optical vector modulator. The optical vector modulator is realized by splitting a supplied input optical signal into a plurality of parallel similar optical signals, controllably adjusting the phase and/or amplitude of each of the plurality of optical signals and delaying the resulting optical signals in a prescribed manner relative to one another. Then, the “delayed” signals are combined to yield the optical signal comprising the vector modulated input optical signal to be transmitted as an output. In one particular embodiment, both the phase and amplitude is adjusted of each of the plurality of parallel optical signals, and the error control signals for effecting the adjustments are generated in response to the optical modulator optical output signal utilizing the unique Opto-Electronic LMS process.

摘要翻译： 自适应光学并行均衡器架构基于可控光调制器装置，以实现包括多个系数抽头的光FIR（有限脉冲响应）滤波器，以便对每个光FIR滤波器系数进行独立控制。 使用独特的自适应光电LMS（最小均方）处理来产生用于控制光学并行均衡器的多个并行抽头系数的电子误差信号。 电子误差信号被用作优化标准，因为需要光电检测后的电子信号来实现在误码率（BER）方面的任何可测量的性能。 在具体实施例中，通过采用光矢量调制器来实现可控光并行FIR滤波器。 光矢量调制器通过将提供的输入光信号分成多个平行的相似的光信号来实现，可控制地调节多个光信号中的每一个的信号的相位和/或幅度，并以相对于 另一个。 然后，“延迟”信号被组合以产生包括作为输出发送的矢量调制输入光信号的光信号。 在一个特定实施例中，相位和振幅都被调整为多个平行光信号中的每一个，并且用于进行调整的误差控制信号响应于使用独特的光电LMS处理的光调制器光输出信号 。

公开(公告)号：US20050111847A1

公开(公告)日：2005-05-26

申请号：US10718073

申请日：2003-11-20

申请人： Chandra Jasti ,  Hermann Gysel ,  Mani Ramachandran

发明人： Chandra Jasti ,  Hermann Gysel ,  Mani Ramachandran

IPC分类号： H04B10/18 ,  H04J14/02 ,  H04B10/12

CPC分类号： H04B10/2513 ,  H04J14/0221

摘要： A dispersion compensator is provided that includes an input port 102 for receiving a WDM optical signal and a dispersion compensating element 110 coupled to the input port for substantially compensating the WDM optical signal for dispersion that has accumulated along an external transmission path. The dispersion compensator also includes an output port 104 for directing the dispersion compensated WDM optical signal to an external element and a dynamic power controller 106, 108, 112, 114, 116 for maintaining a total power of the WDM signal below a prescribed level prior to receipt of the WDM optical signal by the dispersion compensating element.

摘要翻译： 提供了一种色散补偿器，其包括用于接收WDM光信号的输入端口102和耦合到输入端口的色散补偿元件110，用于基本上补偿沿着外部传输路径累积的色散的WDM光信号。 色散补偿器还包括用于将色散补偿的WDM光信号引导到外部元件的输出端口104和用于将WDM信号的总功率维持在规定水平之前的动态功率控制器106,108,112,114,116， 通过色散补偿元件接收WDM光信号。

公开(公告)号：US06879426B1

公开(公告)日：2005-04-12

申请号：US10178949

申请日：2002-06-24

申请人： Andrew Marc Weiner

发明人： Andrew Marc Weiner

IPC分类号： G02F1/1347 ,  H04B10/18 ,  G02F1/01 ,  G02B26/00

CPC分类号： H04B10/2513 ,  G02F1/13471 ,  G02F2201/17 ,  G02F2203/12 ,  G02F2203/50

摘要： A system and method for programmable phase compensation of optical signals is disclosed. The systems and methods include the use of a polarization-independent spatial light modulator (PI-SLM), so that the state of polarization (SOP) of the incoming optical signal need not be known. The system includes a first dispersive module that spatially separates the optical signal into its frequency components. The frequency components are spread over the active area of the PI-SLM. The active area of the PI-SLM includes an array of independently programmable addressable regions capable of altering the phase of the light incident thereon. An exemplary application of the invention is chromatic dispersion compensation. By knowing the amount of chromatic dispersion in the optical signal, or alternatively, by knowing the amount of chromatic dispersion to be introduced into the optical signal downstream, the appropriate phase adjustments can be made to each frequency component of the signal. The phase-adjusted frequency components are then recombined via a second dispersive module to form a compensated optical signal.

摘要翻译： 公开了一种用于光信号的可编程相位补偿的系统和方法。 系统和方法包括使用偏振无关的空间光调制器（PI-SLM），使得入射光信号的偏振状态（SOP）不需要是已知的。 该系统包括将光信号空间分离成其频率分量的第一色散模块。 频率分量分布在PI-SLM的有效区域上。 PI-SLM的有效区域包括能够改变入射在其上的光的相位的独立可编程可寻址区域的阵列。 本发明的示例性应用是色散补偿。 通过知道光信号中的色散量，或者通过知道要被引入光信号下行的色散量，可以对信号的每个频率分量进行适当的相位调整。 然后通过第二色散模块将经相位调整的频率分量重组，以形成补偿的光信号。

公开(公告)号：US20050047802A1

公开(公告)日：2005-03-03

申请号：US10653317

申请日：2003-09-02

申请人： Lonnie Jaynes ,  Jerry Wood

发明人： Lonnie Jaynes ,  Jerry Wood

IPC分类号： H04B10/158 ,  H04B10/18 ,  H04B10/08

CPC分类号： H04B10/2513

摘要： An adaptive infinite impulse response (IIR) filter compensates for dispersive distortion in a fiber optic channel. The weighting coefficients of the IIR filter are updated in accordance with an error signal obtained by differentially combining the output of the IIR filter with downstream decision values or with an undistorted training signal. Undistorted training signals may be derived from training patterns (e.g., preamble) expressly transmitted for the purpose by the upstream transmitter, or from non-training, but known or predictable patterns transmitted by the upstream transmitter.

摘要翻译： 自适应无限脉冲响应（IIR）滤波器补偿光纤通道中的色散失真。 IIR滤波器的加权系数根据通过差分地组合IIR滤波器的输出与下行判定值或未失真的训练信号而获得的误差信号来更新。 可以从由上游发射机为此目的明确传输的训练模式（例如，前同步码）或由上行发射机发送的非训练但已知或可预测的模式导出非失真训练信号。

公开(公告)号：US20040218932A1

公开(公告)日：2004-11-04

申请号：US10425808

申请日：2003-04-29

发明人： Richard Epworth ,  Peter Anslow ,  Christopher R. Fludger

IPC分类号： H04B010/06

CPC分类号： H04B10/2513 ,  H04B10/60 ,  H04B10/697

摘要： Use in an optical communications system of multiple detectors to separately detect respective multiple spectral modes of a received optical signal. The invention also provides for corresponding multi-channel, dispersion-tolerant optical receivers. Embodiments are presented both for direct detection and for coherent detection of optical signals.

摘要翻译： 在多个检测器的光通信系统中使用以分别检测所接收的光信号的相应多个频谱模式。 本发明还提供了相应的多通道，分散容忍光接收机。 呈现实施例用于直接检测和用于光信号的相干检测。

公开(公告)号：US20040213578A1

公开(公告)日：2004-10-28

申请号：US10784989

申请日：2004-02-25

申请人： FUJITSU LIMITED

发明人： Tomoo Takahara ,  Hiroki Ooi ,  George Ishikawa

IPC分类号： H04B010/12

CPC分类号： H04B10/2513

摘要： The dispersion monitoring device of the present invention detects a change in dispersion caused in a system by performing the decision process of a received signal using a data flip-flop in which required decision phase and decision threshold are set, averaging the output signal of the data flip-flop using an integration circuit and determining a received waveform, based on a change in a level of an output signal from the integration circuit. In another preferred embodiment, a signal is inputted to a chromatic dispersion change sign monitor. If a chirping parameter is correctly set, residual chromatic dispersion shifts in the negative direction when the peak value of a received signal is large, and it shifts in the positive direction when the peak value of a received signal is small. Using this fact, optimum dispersion compensation is conducted.

摘要翻译： 本发明的色散监视装置通过使用其中设置了所需判定相位和判定阈值的数据触发器执行接收信号的判定处理来检测系统中引起的色散变化，对数据的输出信号进行平均 基于来自积分电路的输出信号的电平的变化，使用积分电路的触发器和确定接收的波形。 在另一个优选实施例中，信号被输入到色散改变符号监视器。 如果正确设定了啁啾参数，则当接收信号的峰值较大时，残留色散沿负方向偏移，并且当接收信号的峰值较小时，其向正方向偏移。 使用这个事实，进行最佳色散补偿。

公开(公告)号：US20040208606A1

公开(公告)日：2004-10-21

申请号：US10108514

申请日：2002-03-29

发明人： Alan F. Graves

IPC分类号： H04J014/02 ,  H04B010/00

CPC分类号： H04B10/2513

摘要： A system for detecting dispersion in an incoming optical signal centered about a channel center frequency. The system includes a splitter unit for separating the incoming signal into first and second groups of signals. The system further includes a first compensation region adapted to apply a desired positive dispersion characteristic to a signal in the first group and a second compensation region adapted to apply a desired negative dispersion characteristics to a signal in the second group. The splitter also includes a receiver unit connected to the first and second compensation regions, and adapted to compare the received signals and to detect the dispersion in the incoming optical signal on the basis of the comparison. The system can be selectively balanced at different optical frequencies by varying the amount of dispersion applied by the first and second compensation regions. It is thus possible to balance the system at a given channel center frequency such measurement of a minimal resultant dispersion in the receiver unit is indicative of the incoming optical signal being dispersion-free at that frequency.

摘要翻译： 一种用于检测以通道中心频率为中心的输入光信号中的色散的系统。 该系统包括分离器单元，用于将输入信号分离成第一和第二组信号。 该系统还包括适于将期望的正色散特性应用于第一组中的信号的第一补偿区域和适于将期望的负色散特性应用于第二组中的信号的第二补偿区域。 分路器还包括连接到第一和第二补偿区域的接收器单元，并且适于比较接收到的信号并且基于该比较来检测输入光信号中的色散。 可以通过改变由第一和第二补偿区域施加的色散量，在不同的光学频率下选择性地平衡该系统。 因此，可以在给定的信道中心频率处平衡系统，这样在接收机单元中的最小合成色散的测量指示入射光信号在该频率处是无色散的。

公开(公告)号：US20040161243A1

公开(公告)日：2004-08-19

申请号：US10779797

申请日：2004-02-18

申请人： Fujitsu Limited

发明人： Hiroki Ooi ,  George Ishikawa ,  Yuichi Akiyama

IPC分类号： H04B010/00

CPC分类号： H04B10/2507 ,  H04B10/2513 ,  H04B10/2569 ,  H04B10/2572

摘要： A dispersion compensation controlling apparatus used in a very high-speed optical communication system adopting optical time division multiplexing system comprises a first specific frequency component detecting unit (2a) detecting a first specific frequency-component in a baseband spectrum in a transmission optical signal inputted to a receiving side over a transmission fiber as a transmission line (6a), a first intensity detecting unit (3a) detecting information on an intensity of the first specific frequency component detected by the first specific frequency component detecting unit (2a and a polarization-mode dispersion controlling unit (220a) con trolling a polarization-mode dispersion quantity of the transmission line (6a) such that the intensity of the first specific frequency component detected by the first intensity detecting unit. (3a) becomes the maximum, thereby easily detecting and compensating polarization-mode dispersion generated in a high-speed optical signal.

摘要翻译： 在采用光时分多路复用系统的非常高速的光通信系统中使用的色散补偿控制装置包括：第一特定频率分量检测单元（2a），检测在基带频谱中输入的传输光信号中的第一特定频分量 通过传输光纤作为传输线（6a）的接收侧，第一强度检测单元（3a）检测由第一特定频率分量检测单元（2a）检测的第一特定频率分量的强度和偏振模式 控制传输线（6a）的偏振模色散量的分散控制单元（220a），使得由第一强度检测单元检测的第一特定频率分量的强度（3a）变得最大，从而容易地检测和 补偿在高速光信号中产生的偏振模色散。

公开(公告)号：US06775631B2

公开(公告)日：2004-08-10

申请号：US10022666

申请日：2001-12-17

申请人： Andre Van Schyndel

发明人： Andre Van Schyndel

IPC分类号： G06F1900

CPC分类号： H04B10/2513 ,  H04B2210/252

摘要： A method and apparatus for compensating, in the electrical domain, for chromatic dispersion of an optical signal is disclosed. A received optical signal is converted to an electrical signal. The spectrum of the electrical signal is amplified by a factor derived from its frequency; and the phase of regions of said spectrum is selectively inverted to thereby allow recovery of the transmitted data. The optical signal may have a non-infinite extinction ratio to improve recovery of the transmitted signal. The square root of the electrical signal may be taken to improve recovery of the transmitted signal.

摘要翻译： 公开了一种用于在电域中补偿光信号的色散的方法和装置。 接收到的光信号被转换成电信号。 电信号的频谱由其频率导出的因子放大; 并且所述频谱的区域的相位被选择性地反转，从而允许恢复所发送的数据。光信号可以具有非无限大的消光比以改善发射信号的恢复。 可以采用电信号的平方根来改善发射信号的恢复。

公开(公告)号：US06735397B2

公开(公告)日：2004-05-11

申请号：US09808855

申请日：2001-03-14

申请人： Kenneth R. Herrity

发明人： Kenneth R. Herrity

IPC分类号： H04B1018

CPC分类号： H04B10/2513 ,  H04J14/02 ,  H04L25/14 ,  H04L25/4908

摘要： This invention uses fiber characteristics combined with knowledge of the 8b10b code to discover and compensate for skew between parallel data streams, caused by chromatic dispersion, in a WDM system allowing the receiver to recover both the data and timing of the data streams as they were originally launched. This skew discovery and compensation does not require the insertion or deletion of any control symbols to/from the original 8b10b streams, and does not require the use of a training or sample sequence.

摘要翻译： 本发明使用与8b10b码的知识结合的光纤特征来发现和补偿WDM系统中由色散引起的并行数据流之间的偏斜，允许接收机原始恢复数据流的数据和定时 推出。 这种偏斜发现和补偿不需要向原始8b10b流插入或删除任何控制符号，并且不需要使用训练或采样序列。