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Constructions and analysis of crosstalk-free optical queues

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4 Author(s)
Hao-Wei Lan ; Inst. of Commun. Eng., Nat. Tsing Hua Univ., Hsinchu ; Cheng-Shang Chang ; Cheng, J. ; Duan-Shin Lee

There are several recent advances in the constructions of conflict-free optical queues using optical switches and fiber delay lines (SDL). Many of these conflict-free optical queues are constructed by 2 times 2 switches and thus suffer from the notorious crosstalk problem. To alleviate the crosstalk problem, it is suggested in the literature that one should avoid routing two packets to the same 2 times 2 switch at the same time. A construction with such a property is called crosstalk-free. Our first contribution of this paper is to extend the two-step method by Deng and Lee to a three-step method that converts a conflict-free SDL element into a crosstalk-free SDL element. For certain optical queues, including linear compressors, linear decompressors, and non-overtaking delay lines, an additional step (the fourth step in our paper) can be taken to further reduce the construction complexity. For such optical queues, one only needs one more 2 times 2 switch than the original construction. Our second contribution of this paper is to provide worst case analysis of the signal-to-noise ratio (SNR) in both the original conflict-free SDL element and the converted crosstalk-free SDL element. Closed-form expressions for the worst case SNRs in both SDL elements are obtained. These expressions show that the gain of the worst case SNR in the converted crosstalk-free SDL element is quite substantial.

Published in:

High Performance Switching and Routing, 2008. HSPR 2008. International Conference on

Date of Conference:

15-17 May 2008