知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

30 条记录 (耗时 0.021 秒)

    Methods and apparatus for polarization control
    3.
    发明授权
    Methods and apparatus for polarization control 有权
    用于偏振控制的方法和装置

    公开(公告)号：US07154670B2

    公开(公告)日：2006-12-26

    申请号：US10796930

    申请日：2004-03-10

    申请人： Hongbin Zhang ,  Li Liu ,  R. Brian Jander ,  Alexei N. Pilipetskii

    发明人： Hongbin Zhang ,  Li Liu ,  R. Brian Jander ,  Alexei N. Pilipetskii

    IPC分类号： G02B27/28

    CPC分类号： G02F1/0136

    摘要： Methods and apparatus of performing polarization control for optical transmissions. The methods and apparatus enable polarization control devices to achieve a desired output state of polarization regardless of the input state of polarization. The desired state of polarization can be achieved by rotating waveplates in a polarization controller in a sequential fashion. Each waveplate may be continually adjusted or dithered so long as the feedback signal satisfies a feedback condition. Once the feedback signal exceeds the feedback condition, the next waveplate in the polarization controller is adjusted. This enables the methods and apparatus to rapidly adjust the state of polarization away from dead spots and minimize loss control problems.

    摘要翻译： 执行光传输的偏振控制的方法和装置。 该方法和装置使得偏振控制装置能够实现期望的输出极化状态，而与偏振的输入状态无关。 可以通过以顺序方式在偏振控制器中旋转波片来实现期望的偏振状态。 只要反馈信号满足反馈条件，每个波片可以被连续地调节或抖动。 一旦反馈信号超过反馈条件，调整偏振控制器中的下一个波片。 这使得方法和装置能够将极化状态快速地调整为远离死点并最小化损失控制问题。

    Detection of Data in Signals with Data Pattern Dependent Signal Distortion
    4.
    发明申请
    Detection of Data in Signals with Data Pattern Dependent Signal Distortion 有权
    用数据模式相关信号失真检测信号中的数据

    公开(公告)号：US20100232809A1

    公开(公告)日：2010-09-16

    申请号：US12718132

    申请日：2010-03-05

    申请人： Yi Cai ,  Morten Nissov ,  Alexei N. Pilipetskii

    发明人： Yi Cai ,  Morten Nissov ,  Alexei N. Pilipetskii

    IPC分类号： H04B10/06 ,  H04L27/00

    CPC分类号： H04J14/02 ,  H04B10/2507 ,  H04B10/697 ,  H04J14/0279

    摘要： A detection system and method may be used to detect data transmitted in a signal with data pattern dependent signal distortion. In general, a detection system and method compares samples of a received signal with stored samples of distorted signals associated with known data patterns and selects the known data patterns that correspond most closely with the samples of the received signal. The detection system and method may thus mitigate the effects of data pattern dependent signal distortion.

    摘要翻译： 可以使用检测系统和方法来检测在具有数据模式相关信号失真的信号中发送的数据。 通常，检测系统和方法将接收信号的样本与已知数据模式相关联的失真信号的存储样本进行比较，并且选择与接收信号的采样最紧密对应的已知数据模式。 因此，检测系统和方法可以减轻数据模式相关信号失真的影响。

    Method and apparatus for reducing nonlinear penalties by proper arrangement of the dispersion map in an optical communication system
    5.
    发明授权
    Method and apparatus for reducing nonlinear penalties by proper arrangement of the dispersion map in an optical communication system 有权
    用于通过在光通信系统中适当布置色散图来减少非线性处罚的方法和装置

    公开(公告)号：US06311002B1

    公开(公告)日：2001-10-30

    申请号：US09204044

    申请日：1998-12-01

    申请人： Steven G. Evangelides ,  Ekaterina A. Golovchenko ,  Vincent J. Mazurczyk ,  Alexei N. Pilipetskii

    发明人： Steven G. Evangelides ,  Ekaterina A. Golovchenko ,  Vincent J. Mazurczyk ,  Alexei N. Pilipetskii

    IPC分类号： G02B602

    CPC分类号： G02B6/29377 ,  G02B6/29394 ,  H04B10/25253

    摘要： A method and apparatus is provided for compensating for dispersion in a wavelength division multiplexed (WDM) optical communication system. The system includes a transmitting and receiving terminal for transmitting and receiving, respectively, an optical signal having a plurality of channels, and an optical fiber transmission path coupling the first and second terminals. The fiber transmission path has a dispersion substantially equal to zero for a selected channel, positive dispersion for a first set of channels, and negative dispersion for a second set of channels. The method begins by providing positive dispersion compensation to the second set of channels at one of the terminals. Negative dispersion compensation is provided to the first set of channels, also at one of the terminals.

    摘要翻译： 提供了一种用于补偿波分复用（WDM）光通信系统中的色散的方法和装置。 该系统包括用于分别发送和接收具有多个信道的光信号的发送和接收终端以及耦合第一和第二终端的光纤传输路径。 光纤传输路径对于所选择的信道具有基本上等于零的色散，对于第一组信道具有正色散，对于第二组信道具有负色散。 该方法开始于在一个终端处向第二组信道提供正色散补偿。 在第一组通道中，也在其中一个端子处提供负色散补偿。

    Soft decision threshold control in a signal receiver using soft decision error correction
    7.
    发明授权
    Soft decision threshold control in a signal receiver using soft decision error correction 失效
    使用软判决误差校正在信号接收机中进行软判决阈值控制

    公开(公告)号：US08621307B2

    公开(公告)日：2013-12-31

    申请号：US12108155

    申请日：2008-04-23

    申请人： Yi Cai ,  Jerzy R. Domagala ,  Alexei N. Pilipetskii

    发明人： Yi Cai ,  Jerzy R. Domagala ,  Alexei N. Pilipetskii

    IPC分类号： G06F11/30

    CPC分类号： H04L1/0045

    摘要： A soft decision threshold control system and method may be used with a forward error correction (FEC) scheme to adjust or tune one or more soft decision thresholds in response to one or more bit value averages for the threshold(s) and in response to a bit error rate (BER). The bit value average for a soft decision threshold generally refers to an average number of binary values (e.g., logic ones and/or zeros) occurring in a bit stream detected using the soft decision threshold. For different BER levels in a particular system, for example, one or more of the soft decision thresholds may have a predetermined bit value average, which has been determined to provide a certain level of performance (e.g., an optimum performance). Thus, one or more of the soft decision thresholds may be adjusted such that the bit value averages for the soft decision thresholds are adjusted as a function of the BER. The settings of the soft decision thresholds may also be adjusted in response to changes in a signal amplitude of the input signal being detected.

    摘要翻译： 软判决阈值控制系统和方法可以与前向纠错（FEC）方案一起使用，以响应于阈值的一个或多个比特值平均值并响应于一个或多个阈值平均来调整或调整一个或多个软判决阈值 误码率（BER）。 软判决阈值的比特值平均值通常是指使用软判决阈值检测的比特流中出现的二进制值（例如，逻辑1和/或零）的平均数。 对于特定系统中的不同BER级别，例如，一个或多个软判决阈值可以具有预定的位值平均值，其被确定为提供一定水平的性能（例如，最佳性能）。 因此，可以调整一个或多个软判决阈值，使得对于软判决阈值的比特值平均作为BER的函数进行调整。 还可以响应于被检测的输入信号的信号幅度的变化来调整软判决阈值的设置。

    System and method for adjusting soft decision thresholds in a soft-decision error correction system
    9.
    发明授权
    System and method for adjusting soft decision thresholds in a soft-decision error correction system 失效
    用于在软判决纠错系统中调整软决策阈值的系统和方法

    公开(公告)号：US07363553B2

    公开(公告)日：2008-04-22

    申请号：US10972289

    申请日：2004-10-22

    申请人： Yi Cai ,  Alexei N. Pilipetskii ,  Morten Nissov

    发明人： Yi Cai ,  Alexei N. Pilipetskii ,  Morten Nissov

    IPC分类号： H03M13/00

    CPC分类号： H03M13/45

    摘要： The soft decision thresholds in a soft decision forward error correction (FEC) system may be adjusted based on mutual information of a detected signal. In one embodiment, a recursive algorithm may be used to optimize threshold values by maximizing the mutual information. In another embodiment, an adaptive scheme may be used to optimize threshold values based on a pre-knowledge of the noise in the channel. In a further embodiment, an adaptive scheme may be used to optimize threshold values by without pre-knowledge of the noise in the channel.

    摘要翻译： 可以基于检测到的信号的相互信息来调整软判决前向纠错（FEC）系统中的软判决阈值。 在一个实施例中，可以使用递归算法来通过使互信息最大化来优化阈值。 在另一个实施例中，可以使用自适应方案来基于信道中噪声的预先了解来优化阈值。 在另一个实施例中，可以使用自适应方案来通过没有对信道中的噪声的预先知识来优化阈值。

    Method and apparatus for improving spectral efficiency in fiber-optic communication systems
    10.
    发明授权
    Method and apparatus for improving spectral efficiency in fiber-optic communication systems 有权
    提高光纤通信系统频谱效率的方法和装置

    公开(公告)号：US06452707B1

    公开(公告)日：2002-09-17

    申请号：US09250297

    申请日：1999-02-17

    申请人： Andrej B. Puc ,  Alexei N. Pilipetskii

    发明人： Andrej B. Puc ,  Alexei N. Pilipetskii

    IPC分类号： H04J1402

    CPC分类号： H04B10/25073

    摘要： A method for designing an optical system is disclosed. The optical system launches optical signals modulated with data into a fiber link having a property of inducing nonlinear distortion of the optical signals as a function of signal power of the optical signals and distance traversed in the fiber link. A Q-factor curve for the fiber link is determined as a function of the signal power. A signal power is preselected based on the Q-factor curve. The preselected signal power is associated with a set of channels. A coding gain is preselected based on the preselected signal power and a desired channel spacing for the set of channels.

    摘要翻译： 公开了一种用于设计光学系统的方法。 光学系统将具有数据调制的光信号发射到具有导致光信号的非线性失真的性质的光纤链路中，作为光信号的信号功率和在光纤链路中穿过的距离的函数。 光纤链路的Q因子曲线被确定为信号功率的函数。 基于Q因子曲线预先选择信号功率。 预选信号功率与一组信道相关联。 基于预选信号功率和该组信道的期望信道间隔来预选编码增益。