针对传统光网络传输数据过程中带宽利用率低和网络出现拥塞等不足，基于软件定义网络构建出分组网络与光网络互联的虚拟光网络拓扑结构，并提出一种多路径优化路由分配算法，在链路固定带宽的限制下，仿真计算出各个链路的最大负载以及优化路由分配比例，并借助于ONOS和Mininet仿真工具进行了仿真分析。仿真结果表明，与平均分配算法相比，所提算法可以有效降低数据的传输时延，避免网络拥塞。

Considering the shortage of low bandwidth utilization and congestion of data transmission in traditional optical networks, we construct a Software Defined Network (SDN)-based virtual optical network that comprises of a packet network and an optical network, and propose a multi-path routing algorithm that optimizes the bandwidth allocation. Under the capacity constraints of the transmission link, we calculate the maximum load of each link and optimize the bandwidth allocation in multi-path routing. With the help of ONOS and Mininet simulation tools, we verify that our algorithm can effectively reduce the delay of data transmission and avoid network congestion.