Authors

X. B. Gao; M. A. Bassiouni;G. F. Li

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

optical burst switching; wavelength-division multiplexing; preemption; fairness; WDM NETWORKS; PERFORMANCE; FAIRNESS; IMPROVE; OBS; Optics

Abstract

We introduce a new preemptive scheduling technique for next-generation optical burst switching (OBS) networks considering the impact of cascaded wavelength conversions. It has been shown that when optical bursts are transmitted all optically from source to destination, each wavelength conversion performed along the lightpath may cause certain signal-to-noise deterioration. If the distortion of the signal quality becomes significant enough, the receiver would not be able to recover the original data. Accordingly, subject to this practical impediment, we improve a recently proposed fair channel scheduling algorithm to deal with the fairness problem and aim at burst loss reduction simultaneously in OBS environments. In our scheme, the dynamic priority associated with each burst is based on a constraint threshold and the number of already conducted wavelength conversions among other factors for this burst. When contention occurs, a new arriving superior burst may preempt another scheduled one according to their priorities. Extensive simulation results have shown that the proposed scheme further improves fairness and achieves burst loss reduction as well.

Journal Title

Optical Engineering

Volume

49

Issue/Number

3

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

10

WOS Identifier

WOS:000276931100016

ISSN

0091-3286

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