使用光纤延时线(FDL)来解决光分组交换中的竞争问题,研究系统丢包率、时延与输入端口数、输出端口数、FDL数之间的关系,并比较输入端口优先、FDL优先、输入端口和FDL优先级的三种光分组调度策略。结果表明:适当减少端口数,增大FDL数目可以使丢包率趋近于零;而适当增大端口数,减小FDL数目又可以使时延减小。因此,在使用FDL解决竞争冲突时,端口数和FDL数目的选择很重要,它们之间的关系大小直接影响到丢包率和时延的大小。 The use of optical fiber delay line (FDL) to solve the optical packet switching competition, the study of system packet loss rate, the delay and the number of input ports, the number of output ports, the number of FDL and compare the input port priority, FDL priority , Input port and FDL priority of three optical packet scheduling strategy. The results show that reducing the number of ports and increasing the number of FDLs can bring the packet loss rate to zero. When the number of ports is increased properly and the number of FDLs is reduced, the delay can be reduced. Therefore, the use of FDL to resolve competition conflicts, the number of ports and the choice of the number of FDL is very important, the size of the relationship between them directly affects the size of the packet loss rate and delay.