ROADM (可重构的光分插复用器) 是构建大型全光交换网络的核心设备。目前, 大部分商用ROADM支持无色和无向性, 但无阻塞性由于其高成本仍无法广泛应用, 因此有效降低光通信业务的阻塞率是当前亟待解决的问题。文章基于具有多个上下路端口模块的有阻塞ROADM节点架构, 提出了三种RWA (路由和波长分配)算法, 以有效提高光通道业务的阻塞性能。仿真结果表明, 结合上下路端口状态的波平面算法能有效地降低光通道业务的阻塞率。

The Reconfigurable Optical Add/Drop Multiplexer (ROADM) is a core device for building a large-scale all-optical switching network. At present, most of the commercially available ROADMs support the colorless and directionless features; however, the unblocking feature still cannot be widely applied because of its high cost. Therefore, it is a problem at present demanding prompt solution to effectively reduce the blocking probability of the optical communication traffics. As the existing ROADM nodes have multiple add/drop port modules, this paper proposes three different Routing and Wavelength Assignment (RWA) algorithms. Simulation results show that the Plane-Wave Algorithm (PWA) with the awareness of add/drop port availability at the source and destination nodes can effectively reduce the blocking probability of the optical channel traffics as compared with those without such awareness.