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

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。

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

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.