针对传统弹性光网络采用专用路径1+1保护策略存在资源浪费的问题, 文章提出了一种共享链路保护策略。在检测到链路故障后, 柔性光转发器切换至共享保护链路, 并根据业务的优先级和请求频率重排业务权重, 依据业务权重提供差异化的路由和频谱分配。此外, 文章提出一种以物理网络拓扑结构、业务需求集合和优质业务量占比为约束条件, 以最小化频谱隙利用率为目标, 具有业务区分的路由和频谱分配方法。理论分析和仿真结果表明, 与传统的1+1保护方法相比, 所提保护策略在降低网络拥塞率的同时, 可以最多节省38%的频谱资源, 能够最大限度地实现备份频谱资源的共享。

There is a problem of waste of resources in the dedicated path 1+1 protection strategy in the traditional optical network. In this paper, a priority shared link protection strategy is proposed. After detecting the link failure, the flexible optical transponder switches to the shared protection link, and rearranges the service weight according to the priority of the service and the requested frequency, and provides differentiated spectrum slot allocation according to the service weight. In addition, this paper proposes an optimal routing and spectrum allocation method that considering the physical network topology, the set of service requirements, and the proportion of high-quality services as constraints, and considering the minimization of the utilization of spectrum slots as the goal. The theoretical analysis and simulation results show that compared with the traditional 1+1 protection method, the proposed protection strategy can save up to 38% of the spectrum resources while reducing the network congestion rate, and maximizing the sharing of backup spectrum resources.