Performance of converter pools for contention resolution in optical burst switching

Optical burst switching (OBS) has recently attracted increasing interest as a network architecture for the future optical Internet. In OBS, efficient contention resolution is a key issue. This paper investigates the performance of shared converter pools for contention resolution in OBS. First, key design parameters for contention resolution in OBS nodes which employ wavelength converters and simple fiber delay line (FDL) buffers are discussed. Then, the performance of a converter pool is evaluated for a Poisson and a self-similar traffic model. Depending on load and node dimensioning, the number of wavelength converters can be reduced by 50-75%. Finally, different converter usage strategies for the combination of a converter pool and an FDL buffer are presented and compared. A strategy that prefers FDL's over converters for contention resolution can reduce burst loss probability for converter pools with a small number of converters.

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