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    Topology discovery in optical WDM networks
    1.
    发明授权
    Topology discovery in optical WDM networks 有权
    光学WDM网络拓扑发现

    公开(公告)号：US06968131B2

    公开(公告)日：2005-11-22

    申请号：US09963501

    申请日：2001-09-27

    申请人： Paul David Obeda ,  Robert Michael Bierman ,  Cuong Tu Dang ,  David Edward Nelles ,  Udo Mircea Neustadter

    发明人： Paul David Obeda ,  Robert Michael Bierman ,  Cuong Tu Dang ,  David Edward Nelles ,  Udo Mircea Neustadter

    IPC分类号： H04B10/02 ,  H04B10/08 ,  H04J14/02 ,  H04Q11/00 ,  H04J14/04

    CPC分类号： H04B10/0773 ,  H04B2210/071 ,  H04B2210/074 ,  H04J14/0227 ,  H04J14/0284 ,  H04J14/0287 ,  H04Q2011/009

    摘要： In an optical WDM network, each optical channel is modulated with a respective channel identity. Detectors, conveniently at multiplex ports of optical band filters, detect the channel identities of all of the optical channels in an optical signal at the respective points to produce respective channel lists. A network management system determines channel lists for through ports of the optical band filters, identifies matching pairs of channel lists to determine a topology of each node and to identify optical paths entering or leaving each node, and identifies matching pairs of channel lists for these paths to determine an inter-node topology of the network. The channel identity detector points can alternatively be at the optical paths entering or leaving each node.

    摘要翻译： 在光WDM网络中，每个光信道用相应的信道标识进行调制。 检测器在光带滤波器的多路复用端口方便地检测在各个点的光信号中的所有光信道的信道标识，以产生相应的信道列表。 网络管理系统确定光带过滤器的通过端口的信道列表，识别匹配的信道列表对以确定每个节点的拓扑并且识别进入或离开每个节点的光路径，并且识别这些路径的匹配的信道列表对 以确定网络的节点间拓扑。 信道身份检测点可以替代地在进入或离开每个节点的光路上。

    Method and system for light path monitoring in an optical communication network
    2.
    发明授权
    Method and system for light path monitoring in an optical communication network 有权
    光通信网络光路监测方法及系统

    公开(公告)号：US07529480B2

    公开(公告)日：2009-05-05

    申请号：US10725025

    申请日：2003-12-02

    申请人： Nabil Seddigh ,  Biswajit Nandy ,  Paul David Obeda ,  Douglas Heath Patriarche ,  Udo Mircea Neustadter

    发明人： Nabil Seddigh ,  Biswajit Nandy ,  Paul David Obeda ,  Douglas Heath Patriarche ,  Udo Mircea Neustadter

    IPC分类号： H04B10/08 ,  H04B17/00 ,  H04J14/02

    CPC分类号： H04J14/0241 ,  H04B10/0793 ,  H04J14/0227 ,  H04J14/0283 ,  H04J14/0286

    摘要： A method for monitoring lightpaths in an optical network comprising nodes interconnected by wavelength-multiplexed links is disclosed. Each lightpath is identified by a respective optical signature. A node stores identifiers of optical signatures of lightpaths designated to traverse the node and identifiers of adjacent nodes. Each node also maintains a record of all optical signatures it detects. A command-line interface associated with a selected node tracks a selected lightpath, designated to traverse the selected node, by propagating messages in an upstream direction, a downstream direction, or both, requesting other nodes to provide information pertinent to the selected lightpath. The selected node may also send messages to all its neighboring nodes requesting each to indicated detection, or otherwise, of the selected lightpath. Thus, the method relies on localized information, maintained at each node, and cooperative exchange of data among nodes without interacting with a centralized network management facility.

    摘要翻译： 公开了一种用于监视包括通过波分复用链路互连的节点的光网络中的光路的方法。 每个光路由相应的光学特征识别。 节点存储指定为遍历节点的光路的光学签名的标识符和相邻节点的标识符。 每个节点还维护其检测到的所有光学签名的记录。 与所选节点相关联的命令行界面通过在上行方向，下游方向或两者上传播消息来跟踪所指定的遍历所选节点的光路，请求其他节点提供与所选光路相关的信息。 所选择的节点还可以向所有其相邻节点发送消息，请求每个消息指示所选择的光路的检测或其他选择。 因此，该方法依赖于在每个节点处维护的本地化信息，并且在不与集中式网络管理设备交互的情况下在节点之间进行协作交换数据。

    Method and system for compensating for side effects of cross gain modulation in amplified optical networks
    4.
    发明授权
    Method and system for compensating for side effects of cross gain modulation in amplified optical networks 有权
    用于补偿放大光网络中交叉增益调制的副作用的方法和系统

    公开(公告)号：US07127165B2

    公开(公告)日：2006-10-24

    申请号：US10628418

    申请日：2003-07-29

    申请人： Paul David Obeda ,  Robert Michael Bierman ,  James Benson Bacque ,  Colin Geoffrey Kelly ,  Derrick Remedios ,  Ping Wai Wan

    发明人： Paul David Obeda ,  Robert Michael Bierman ,  James Benson Bacque ,  Colin Geoffrey Kelly ,  Derrick Remedios ,  Ping Wai Wan

    IPC分类号： H04B10/08

    CPC分类号： H04B10/079 ,  H04B10/07955 ,  H04B2210/075

    摘要： A method and system for compensating for side effects of cross gain modulation in amplified optical networks, which allows reliable identification of expected and unexpected channels in the network is provided. Each optical channel traveling in the optical network is marked with a unique channel signature (expected channel signature), having one or more dither tone modulated onto the optical channel; followed by detecting a spectrum of tones, including said modulated dither tones and ghost tones thereof produced by the cross gain modulation in the optical network, at various locations in the optical network. Amplitudes of the spectrum tones, which belong to the expected channel signature, are compared with a first threshold, while amplitudes of the remaining spectrum tones, which are not the valid tones, are compared with a second threshold, which is lower than the first threshold. The spectrum tones are identified as valid tones if their amplitudes are above the first threshold; and an alarm signaling that the expected channel signature is missing is generated if the amplitude of the spectrum tone is below the first threshold. Yet another alarm is generated signaling that an unexpected channel is detected in the network if the amplitude of at least one of the remaining spectrum tones is exceeding the second threshold. Alternatively, the other alarm is generated if amplitudes of the remaining spectrum tones belonging to one of the allowable channel signatures in the network are above the second threshold. A corresponding system incorporating the step of the methods described above is also provided.

    摘要翻译： 提供了一种用于补偿放大光网络中交叉增益调制的副作用的方法和系统，其允许可靠地识别网络中的预期和意外信道。 在光网络中行进的每个光信道被标记为具有调制到光信道上的一个或多个抖动音调的唯一信道签名（预期信道签名）; 随后在光网络中的各个位置处检测包括由光网络中的交叉增益调制产生的所述调制抖动音和其重音的音调。 将属于预期信道签名的频谱音调的幅度与第一阈值进行比较，而不是有效音调的剩余频谱音调的幅度与低于第一阈值的第二阈值进行比较 。 如果它们的幅度高于第一阈值，则频谱色调被识别为有效音调; 并且如果频谱色调的幅度低于第一阈值，则产生警告，指示预期信道签名丢失。 如果剩余频谱色调中的至少一个的幅度超过第二阈值，则产生另一报警，指示在网络中检测到意外信道。 或者，如果属于网络中的一个可允许频道签名的剩余频谱的幅度高于第二阈值，则产生另一警报。 还提供了包括上述方法的步骤的相应系统。

    Method and system for operating a plurality of electronic variable optical attenuators (eVOAs)
    5.
    发明授权
    Method and system for operating a plurality of electronic variable optical attenuators (eVOAs) 失效
    用于操作多个电子可变光衰减器（eVOA）的方法和系统

    公开(公告)号：US06996323B2

    公开(公告)日：2006-02-07

    申请号：US10618582

    申请日：2003-07-15

    申请人： Gordon Bruce Scarth ,  Robert Michael Bierman ,  Paul David Obeda ,  Omayma Moharram ,  Victoria Donnelly

    发明人： Gordon Bruce Scarth ,  Robert Michael Bierman ,  Paul David Obeda ,  Omayma Moharram ,  Victoria Donnelly

    IPC分类号： G02B6/00

    CPC分类号： H04B10/07955 ,  H04B10/077

    摘要： A system and method for operating a plurality of eVOAs in an optical network is provided. The system comprises a number of eVOAs, each eVOA coupled to one or more optical taps and connected to a microcontroller. The microcontroller comprises a monitor signal processing controller for measuring the power of the optical signal at the eVOAs; a scheduler for continuously cycling and checking the eVOAs operating attenuations; a microprocessing controller for determining, setting, adjusting and updating the eVOA operating attenuation and a means for communications between the microprocessor and the other controller within the system. The microcontroller cycles through the plurality of eVOAs and controls one eVOA at a time according to a predetermined method of the eVOA operation. Individual eVOAs may be controlled according to the same or different methods of controlling operations thereof as required.

    摘要翻译： 提供了一种在光网络中操作多个eVOA的系统和方法。 该系统包括多个eVOA，每个eVOA耦合到一个或多个光学抽头并连接到微控制器。 微控制器包括用于测量eVOA处的光信号的功率的监视信号处理控制器; 用于连续循环和检查eVOA操作衰减的调度器; 用于确定，设置，调整和更新eVOA操作衰减的微处理控制器以及用于系统内的微处理器与另一个控制器之间的通信的装置。 微控制器循环通过多个eVOA并根据eVOA操作的预定方法一次控制一个eVOA。 可以根据需要控制其操作的相同或不同的方法来控制各个eVOA。

    Method and system for monitoring performance of optical network
    7.
    发明授权
    Method and system for monitoring performance of optical network 有权
    监控光网络性能的方法和系统

    公开(公告)号：US07184660B2

    公开(公告)日：2007-02-27

    申请号：US10136407

    申请日：2002-05-02

    申请人： Wen Liu ,  Paul David Obeda ,  Niranjan Vethanayagam ,  Dan Oprea

    发明人： Wen Liu ,  Paul David Obeda ,  Niranjan Vethanayagam ,  Dan Oprea

    IPC分类号： H04B10/08

    CPC分类号： H04B10/00 ,  H04B2210/075 ,  H04J14/0227 ,  H04J14/0258 ,  H04J14/0264 ,  H04J14/0267 ,  H04J14/0276

    摘要： The invention describes methods and systems for monitoring the performance of an optical network by marking a group of optical signals with a set of identification tags which are unique to network characteristics. In the preferred embodiments, fiber identification (FID) and bundle identification (BID) tags are encoded into optical signals by marking an optical signal with low frequency dither tones whose frequencies are unique to the fiber section and to a bundle of fibers respectively. Detecting of the FID and BID tones provides more effective and accurate monitoring of performance of the optical network and allows determining of the network topology, e.g. paths of optical channels and traffic load through different fiber sections in the network. Other sets of hierarchically arranged identifiers encoded into optical signals have also been proposed, including band, conduit, city, region, country, etc. identifiers, as well as identifiers related to network security and service characteristics.

    摘要翻译： 本发明描述了通过用网络特性唯一的一组识别标签标记一组光信号来监视光网络的性能的方法和系统。 在优选实施例中，光纤识别（FID）和束识别（BID）标签被编码为光信号，通过标记具有低频抖动音调的光信号，其频率分别对于纤维部分和纤维束是唯一的。 FID和BID音调的检测提供对光网络的性能的更有效和准确的监视，并且允许确定网络拓扑，例如， 光通道的路径和通过网络中不同光纤段的流量负载。 还提出了编码成光信号的其他层次排列的标识符集，包括带，导管，城市，区域，国家等标识符，以及与网络安全性和服务特性相关的标识符。