基于快速可调激光器和阵列波导光栅的光交换结构是实现超大容量光交换机的理想选择,但是快速可调激光器的快速调谐要求使得空闲时隙的激光器必须保持发光状态,并对有效业务光信号造成干扰。为了解决此问题,提出了采用无效业务填充空闲时隙的方法,从而使得系统中的有效业务不再受到无效业务的干扰。通过两种不同的方法生成无效业务即随机策略和顺序策略,仿真研究和对比了两种策略在不同业务量下各自的优势。同时,为了降低包含无效业务时的调度算法重排次数要求,还进一步提出了阈值策略计算无效业务路径的方法,并通过仿真验证了该方法可以大大降低重排次数,提高调度算法的计算效率。 Optical switching structures based on rapidly tunable lasers and arrayed waveguide gratings are ideal for implementing very large capacity optical switches, but the fast tuning of rapidly tunable lasers requires that lasers in idle slots must remain lit and cause an effect on the optical signal for efficient service interference. In order to solve this problem, a method of filling idle slots with invalid services is proposed, so that valid services in the system are no longer interfered by invalid services. Through two different methods to generate invalid business that is random strategy and sequence strategy, the simulation study and contrast the respective advantages of the two strategies in different business. At the same time, in order to reduce the number of scheduling algorithm rearrangement requirements when invalid services are included, a threshold method is also proposed to calculate the invalid service paths. Simulation results show that this method can greatly reduce the number of rearrangements and improve the computational efficiency of scheduling algorithms.