格状光网络双链路故障P圈保护算法

针对MESH光网络中两条链路同时发生故障的情形，分析了采用P_Cycle（P圈）为故障链路提供保护的方法，以及在至少3边连通度格状网络中采用P圈实现双链路故障保护的配置策略。提出了一种基于网络工作资源分布和P圈有效跨接链路配置P圈的双链路故障保护启发式算法。使用OPNET软件搭建的ASON仿真平台，采用泛欧COST239网络拓扑和静态业务模型对算法性能进行了仿真。仿真结果证明了该方案在拥有环网快速恢复能力的同时，相比已有算法具有更低的资源冗余度。

A Novel P_Cycle Protection Algorithm for Dual Link Failures in Mesh Optical Networks

The fundamental of the dual link failures protection with P-cycles in mesh optical networks was introduced. The configuration strategy of the protection cycles with P-cycles in networks with at least 3 degrees was then discussed. Furthermore, a heuristic algorithm based on the working resource distribution and the straddling links efficiency was proposed. And the proposed algorithm was simulated in COST239 network under static traffic model on OPNET simulation platform. The results show that the proposed algorithm has shorter restoration time and lower capacity redundancy.