Elastic optical networks (EONs) are able to provide high spectrum utilization efficiency due to flexibility in resource assignment. In translucent EONs, by employing regenerators and using advanced modulation formats for transmission, spectrum efficiency can be further improved. Survivability is regarded as an important aspect of EONs, and p-cycle protection is considered to be an attractive scheme due to its fast restoration and high protection efficiency. In this paper, we propose methods for evaluating and selecting p-cycles for both link protection (LP) and failure-independent path protection (FIPP) to survive single-link failures. After considering the various factors that affect the performance of a p-cycle, we propose two evaluation metrics for LP and FIPP, namely, individual p-cycle cost and set of cycles cost. Based on these metrics, we propose two algorithms for selecting a set of p-cycles in translucent EONs: Traffic Independent P-cycle Selection (TIPS), which selects a set of cycles without knowledge of the traffic, and Traffic-Oriented P-cycle Selection (TOPS), which takes given traffic information into account. A routing and spectrum assignment algorithm is designed for translucent EONs, and our p-cycle design algorithms are evaluated using both static and dynamic traffic models. Simulation results show that the proposed algorithms have better performance than commonly used baseline algorithms. We also compare the performance of LP p-cycles and FIPP p-cycles.

中文翻译：

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半透明弹性光网络中的链路保护和FIPP p周期设计

由于资源分配的灵活性，弹性光网络（EON）能够提供高频谱利用率。在半透明的EON中，通过使用再生器并使用高级调制格式进行传输，可以进一步提高频谱效率。生存能力被视为EON的重要方面，而p周期保护由于其快速恢复和高保护效率而被认为是有吸引力的方案。在本文中，我们提出了评估和选择链路保护（LP）和独立于故障的路径保护（FIPP）的p周期以承受单链路故障的方法。在考虑了影响p周期性能的各种因素之后，我们提出了LP和FIPP的两个评估指标，即单个p周期成本和一组周期成本。根据这些指标，我们提出了两种用于在半透明EON中选择一组p周期的算法：与流量无关的P周期选择（TIPS），它在不了解流量的情况下选择了一组周期；以及针对流量的P周期选择（TOPS），考虑到给定的交通信息。为半透明EON设计了路由和频谱分配算法，并使用静态和动态流量模型对我们的p周期设计算法进行了评估。仿真结果表明，所提出的算法比常用的基线算法具有更好的性能。我们还比较了LP p循环和FIPP p循环的性能。以及面向流量的P周期选择（TOPS），它考虑了给定的流量信息。为半透明EON设计了路由和频谱分配算法，并使用静态和动态流量模型对我们的p周期设计算法进行了评估。仿真结果表明，所提出的算法比常用的基线算法具有更好的性能。我们还比较了LP p循环和FIPP p循环的性能。以及面向流量的P周期选择（TOPS），它考虑了给定的流量信息。为半透明的EON设计了路由和频谱分配算法，并使用静态和动态流量模型对我们的p周期设计算法进行了评估。仿真结果表明，所提出的算法比常用的基线算法具有更好的性能。我们还比较了LP p循环和FIPP p循环的性能。