中文摘要：

文章针对波分复用（WDM）光网络的工作机制，提出了有向P圈的概念和WDM网络基于有向P圈的保护机制及配置策略。同时，提出了对偶圈合并法则和以此为基础的P圈生成和网络保护资源配置启发式算法。为了验证配置方案的有效性，利用OPNET Modeler搭建了自动交换光网络（ASON）-WDM仿真平台，在泛欧COST239网络拓扑和北美NSFnet网络拓扑上进行了大量仿真。仿真结果证明了P圈生成算法和有向P圈配置策略的有效性和可行性。

英文摘要：

In view of the working principle of the optical WDM network, the concept of directional P-cycle is presented and the directional P-cycle-based protection mechanism and deployment strategy expounded. Then the coupling cycle joint method and a heuristic algorithm for the growth of P-cycles and network protection resource deployment based on this method are proposed. Finally, simulations are conducted in COST239 and NSFnet topologies on the ASON-WDM platform set up by using OPNET Modeler. The results show that the algorithm and the deployment strategy are effective and feasible.