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中文摘要：
为了充分利用WDM光网络中空闲波长资源，并提高整个网络性能，对P圈保护算法进行了深入的研究，提出了不同的P圈评价标准，并以此为基础，进一步从基础圈的选择、P圈扩张策略以及P圈扩张周期3个角度出发，提出了一系列新型的P圈生成算法．仿真结果表明，这些新型的P圈生成算法可以应用于不同的网络环境中，与传统的保护算法相比，提高了网络资源的使用效率．
英文摘要：
The P-cycles algorithms in the WDM mesh optical networks was investigated. In order to utilize the free resource adequately and improve the network performance in the WDM network, two evaluation parameters for P-cycles were introduced, and different P-cycles generation algorithms were proposed in terms of three aspects that are elementary cycle-set generation, expansion strategies and expansion times. At last simulation and analysis with these different algorithms will be presented. The simulation results show that the new P-cycles algorithms could be used in the different conditions and the network performance could be improved significantly when implmenting these algorithms.
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