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Scheduling algorithms for shared fiber-delay-line optical packet Switches-part II: the three-stage clos-network case

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4 Author(s)
Shi Jiang ; Dept. of Electr. & Comput. Eng., Polytech. Univ., Brooklyn, NY, USA ; Gang Hu ; Liew, S.Y. ; Chao, H.J.

In all-optical packet switching, packets may arrive at an optical switch in an uncoordinated fashion. To prevent packet loss in the switch, fiber delay lines (FDLs) are used as optical buffers to store optical packets. However, assigning FDLs to the arrival packets to achieve high throughput, low delay, and low loss rate is not a trivial task. In the authors' companion paper, several efficient scheduling algorithms were proposed for single-stage shared-FDL optical packet switches (OPSs). To further enhance the switch's scalability, this work was extended to a multistage case. In this paper, two scheduling algorithms are proposed: 1) sequential FDL assignment and 2) multicell FDL assignment algorithms for a three-stage optical Clos-Network switch (OCNS). The paper shows by simulation that a three-stage OCNS with these FDL assignment algorithms can achieve satisfactory performance.

Published in:

Lightwave Technology, Journal of  (Volume:23 ,  Issue: 4 )

Date of Publication:

April 2005

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