中文摘要：

为了解决WDM网络中多优先级动态业务的路由选择与波长分配问题，提出了一种基于分层图模型的动态RAW算法。通过对分层图中波长链路权值的设定，使得连接请求尽量使用空闲的波长链路建立连接，在空闲波长链路不足以建立起连接时，呼叫业务可抢占比其优先级别低的业务的波长链路，且抢占的顺序由低优先级到高优先级，以确保高优先级业务有更低的阻塞率和更好的传输性能，且使得较高优先级业务被中断的可能性较小。

英文摘要：

In order to solve the problem of routing and wavelength assignment for priority-based dynamic operation in WDM networks, a dynamic RAW algorithm based on layered graph was proposed. By setting the weight of wavelength links, the algorithm makes the connecting call use the empty wavelength links to build the connection first, and when the empty wavelength links are not enough to build the connection, it makes the calling operation occupy the wavelength links of operations whose priority is lower to the calling operation＇s by the order of low priority to high priority, to ensure the high priority operations have lower block probability and better transmission performance, and the high priority operations＇s probability of pause is lower.