Yin Shan, Guo Shijia, Meng Xiangkai, Ma Rong, Guo Bingli, Huang Shanguo
Opt Express. 2021 Mar 1;29(5):6737-6755. doi: 10.1364/OE.400042.
With the rapid development of space division multiplexing (SDM) and flexible grid technology, the problem of resource allocation in optical network becomes much more complicated. Although there emerge a substantial number of works about link protection or restoration in SDM-EONs mesh networks, the topic of survivability is dug deeper in this work. It is acknowledged that protection schemes based on ring covers bring the advantages of shorter restoration time and lower costs. However, the RSCA problem in SDM-EON for link protection based on ring covers has rarely been investigated. To enhance the survivability of SDM-EON and make the best use of ring covers, we initially select a set of rings for the protection of all the links in a network topology according to constrains, aiming at taking full advantages of network resources. After that, we propose an algorithm to recover the traffic which will break off under link failures, basing on the set of rings. At the end of this protection scheme, we arrange the resources fulfilling the constrains of spectrum contiguity and core continuity constrains by using several different algorithms considering physical impairment. Based on the allocation in both spacial and spectral dimensions, our algorithms achieve better results of survivability. According to the simulations conducted for the evaluation of the proposed algorithms, our algorithms manage to recover at least 72.8% of traffic when the traffic request number is set to be 1000.
随着空分复用（SDM）和灵活网格技术的快速发展，光网络中的资源分配问题变得更加复杂。尽管在SDM-EONs网状网络中出现了大量关于链路保护或恢复的工作，但在这项工作中对生存性的主题进行了更深入的探讨。众所周知，基于环覆盖的保护方案具有恢复时间短和成本低的优点。然而，基于环覆盖的SDM-EON中链路保护的RSCA问题很少被研究。为了提高SDM-EON的生存性并充分利用环覆盖，我们首先根据约束条件为网络拓扑中的所有链路选择一组环来进行保护，旨在充分利用网络资源。之后，我们提出一种算法，基于所选的环集来恢复在链路故障时将中断的业务。在这个保护方案的最后，我们使用几种考虑物理损伤的不同算法来安排满足频谱连续性和核心连续性约束的资源。基于空间和频谱维度的分配，我们的算法在生存性方面取得了更好的结果。根据对所提算法进行评估的模拟，当业务请求数量设置为1000时，我们的算法能够恢复至少72.8%的业务。
