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    • 6. 发明授权
    • Method apparatus and computer program product for optical network restoration
    • 光网络恢复方法装置和计算机程序产品
    • US06377374B1
    • 2002-04-23
    • US09441527
    • 1999-11-16
    • Gary B. DavisReddy UrimindiAndrew N. RobinsonRainer IraschkoGeorge Georgiou
    • Gary B. DavisReddy UrimindiAndrew N. RobinsonRainer IraschkoGeorge Georgiou
    • H04J1402
    • H04J14/0295H04J14/0227H04J14/0241H04J14/0284H04Q11/0062H04Q2011/0079H04Q2011/0081
    • An method, apparatus, and computer program product for restoring a failed system in an optical mesh network. A system includes a first light termination element (LTE) and a second LTE. A first node in the network includes an optical switching unit (OSU) coupled to the first (LTE) of the system. A second node in the network includes a second OSU coupled to the second (LTE) of the system. The first node is coupled to the second node by a path. Optical data traffic can be transmitted between the first node and the second node via the path. Upon detection of a failure of the system, the first OSU and second OSU are notified of the failure. A primary role is assigned to one of the first and second OSUs, and a secondary role is assigned to the other one of the first and second OSUs. A primary restoration plan is determined by the primary OSU. Information identifying the primary restoration plan is sent from the primary OSU for effecting the restoration path to restore the system.
    • 一种用于恢复光网状网络中的故障系统的方法,装置和计算机程序产品。 一种系统包括第一光终端元件(LTE)和第二LTE。 网络中的第一节点包括耦合到系统的第一(LTE)的光交换单元(OSU)。 网络中的第二节点包括耦合到系统的第二(LTE)的第二OSU。 第一节点通过路径耦合到第二节点。 光数据业务可以经由路径在第一节点和第二节点之间传输。 在检测到系统故障时,第一OSU和第二OSU被通知该故障。 主要角色分配给第一和第二OSU中的一个,并且次要角色被分配给第一和第二OSU中的另一个。 主要的恢复计划由主要的OSU决定。 从主OSU发送标识主恢复计划的信息,以实现恢复路径以恢复系统。
    • 8. 发明授权
    • Method and system for maintaining an optical path
    • 用于维持光路的方法和系统
    • US5930017A
    • 1999-07-27
    • US990960
    • 1997-12-15
    • Gary B. DavisReddy UrimindiAndrew N. RobisonRainer R. IraschkoGeorge A. GeorgiouGlen Wellbrock
    • Gary B. DavisReddy UrimindiAndrew N. RobisonRainer R. IraschkoGeorge A. GeorgiouGlen Wellbrock
    • H04B10/24H04J14/02
    • H04B10/2503H04J14/0291H04J14/0279
    • Optical loop-back is provided within an optical restoration system of an optical communication network. According to one embodiment, an optical restoration system includes first and second spare optical links (also called restoration paths) optically coupled in parallel between first and second optical cross-connect switches. Each restoration path includes a light regenerator and an optical amplifier. First and second optical cross-connect switches are each switched to provide respective optical loop-back paths between the first and second restoration paths or spare links. In one example, the optical loop-back paths can be configured within the optical cross-connect switches. In another example, the optical cross-connect switches are configured to couple optical signals between an external loop-back coupler and the first and second restoration paths or spare links. According to another embodiment, the first and second optical cross-connect switches are each switched to provide respective optical loop-back paths between different WDM channels in a bidirectional restoration path or spare link. In one example, the optical loop-back paths can be configured within the optical cross-connect switches. In another example, the optical cross-connect switches are configured to couple optical signals for different WDM channels between an external loop-back coupler and the bi-directional restoration path or spare link. Through loop-back connections, optical signals from light regenerators can travel along an idle restoration paths to squelch false alarms by light regenerators and to keep the optical amplifiers stabilized. Through loop-back connections, optical signals from light regenerators can also travel along a working path to squelch false alarms by light regenerators and to stabilize optical amplifiers in the working path prior to normalization.
    • 在光通信网络的光学恢复系统内提供光环回。 根据一个实施例,光学恢复系统包括在第一和第二光交叉连接开关之间并联光耦合的第一和第二备用光学链路(也称为恢复路径)。 每个恢复路径包括光再生器和光放大器。 第一和第二光交叉连接开关各自被切换以在第一和第二恢复路径或备用链路之间提供相应的光环回路径。 在一个示例中,光环回路径可以配置在光交叉连接交换机内。 在另一示例中,光交叉连接开关被配置为耦合外部环回耦合器与第一和第二恢复路径或备用链路之间的光信号。 根据另一实施例,第一和第二光交叉连接交换机各自被切换以在双向恢复路径或备用链路中的不同WDM信道之间提供相应的光环回路径。 在一个示例中,光环回路径可以配置在光交叉连接交换机内。 在另一示例中,光交叉连接交换机被配置为在外部环回耦合器和双向恢复路径或备用链路之间耦合用于不同WDM信道的光信号。 通过环回连接,来自光再生器的光信号可以沿着空闲的恢复路径行进,通过光再生器来镇压虚警,并保持光放大器的稳定。 通过环回连接,来自光再生器的光信号也可以沿着工作路径行进,通过光再生器来镇压虚警,并在归一化之前使工作路径中的光放大器稳定。