光分组交换网络的冲突解决:用光纤延迟线还是波长转换器  

Contention Resolution in Optical Packet Switched Networks: Using Fiber Delay-Lines or Wavelength Converters

作　　者：张治中[1] 曾庆济[1] 王建新[1] 雒江涛[1] 

机构地区：[1]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室

出　　处：《电子与信息学报》2004年第11期1812-1818,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(69990540);国家863计划(2001AA121073)资助

摘　　要：该文研究了光分组网络的冲突处理问题,提出了两种异于传统设计方法的交换结构。研究表明:对于非突发性业务,非简并排列方式的光纤延迟线是成本最低的解决手段;而对于突发业务,将波长转换器和延迟线结合使用是兼顾分组丢弃性能,系统体积和成本的较好策略,文中基于此给出了系统设计原则,该原则可确保系统节约大量的波长转换器和延迟线,对改善系统的整体性能十分有利。This paper proposes two new switch architectures that are more flexible and cost effective than the methods introduced in the literatures. For a given packet loss probability requirement, the results demonstrate that (1) for non-bursty traffic, non-degenerate form of Fiber Delay-Lines (FDLs) is the most cost effective solution; (2) for bursty traffic, a combined use of degenerate FDLs and Tunable Wavelength Converters (TWCs) is a cost effective and robust solution. With the increase of the average burst length, i.e.,burstiness,the number of TWCs needs to be increased so as to maintain a reasonable packet loss probability. However, even for the traffic with high degree of burstiness, the architecture that employs a set of degenerate FDLs and TWCs shared among the input lines, is still a cost effective and robust solution.

关 键 词：光分组交换 光缓存 波长转换器 共享 分组丢弃率 

分 类 号：TN929.1[电子电信—通信与信息系统]