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
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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聚低的解决手段；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纽丢弃性能，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．Abstract: 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 resiilts 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.
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