中文摘要：

为在弹性光网络中实现最大化的备份频谱资源共享，提出了一种基于负载均衡的优先共享通路保护算法．在降低网络的阻塞率和保护开销时，综合考虑业务的传输距离、频谱资源利用率及链路状态等因素，建立整数线性规划模型确立优化目标，并提出启发式算法对路由和频谱分配联合优化选路，从而提供100％的单链路故障保护。仿真结果表明，与传统共享通路保护算法相比，所提算法在降低网络阻塞率的同时更有效地降低了保护开销，最大限度地实现备份频谱资源的共享．

英文摘要：

In order to maximize backup spectrum resources sharing of connections with different bandwidth requests in elastic optical networks, a preferential shared path protection algorithm with load balance is de- veloped. An integer linear program is formulated to provide the optimal working and backup path for each connection request instantly on the premise of making comprehensive consideration for the physical dis- tance, resource utilization and the link status. Furthermore, a heuristic algorithm is presented to optimize jointly the route selection of the working path and backup path, so that 100% single link failure protection can be provided. Compared to the conventional shared path protection algorithm, the proposed preferential shared path protection （PSPP） algorithm is effective in reducing blocking probability and improving spec- tral efficiency.