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| Contention Resolution in Optical Packet Switched Networks: Using Fiber Delay-Lines or Wavelength Converters |
| Zhang Zhi-zhong①②;Zeng Qing-ji①; Wang Jian-xin①; Luo Jiang-tao①② |
| ①R&D Center for Broadband Optical Networking Tech.,Shanghai Jiaotong Univ., Shanghai 200030 China;②Dept of Commun. Eng.,Chongqing Univ. of Posts and Telecomm.,Chongqing 400065 China |
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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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Received: 15 May 2003
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2004, Vol. 26 
