Efficient Wavelength Assignment Strategies in WDM Optical Mesh Networks: The Multicast Case

M. Sarhan and A. El-Amawy (USA)


Blocking Probability, RWA Problem, WDM Mesh,Wavelength Assignment, Multicast Routing.


Extending the analysis of wavelength assignment strategies in [1], this paper analyzes a set of novel wavelength assignment strategies for regular WDM meshes for the multicast case. The strategies are designed with the purpose of avoiding collisions taken into account a priori. The concept is to relate the routing algorithm and the wavelength assignment so as to avoid collisions as much as possible. We assume different numbers of wavelengths and proceed to estimate the blocking probabilities under different strategies assuming uniform distribution of destinations. The results show that well designed off-line strategies outperform the random ones. We provide reasoning for designing near-optimal solutions. The concepts underlying this work can be extended to irregular networks. Alternatively, a virtual regular mesh can be embedded in the irregular graph so as to utilize the power and performance obtainable with regular topologies.

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