Effective preemptive scheduling scheme for optical burst-switched networks with cascaded wavelength conversion consideration

Xingbo Gao
2010 Optical Engineering: The Journal of SPIE  
We introduce a new preemptive scheduling technique for next-generation optical burst switching ͑OBS͒ 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
more » ... cover 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. © 2010 Society of Photo-Optical Instrumentation Engineers.
doi:10.1117/1.3363610 fatcat:s2merduf5fe5rcw3afyhdkckc4