Wavelength decomposition approach for computing blocking probabilities in multicast WDM optical networks

We present an approximate analytical method to evaluate the blocking probabilities in multicast Wavelength Division Multiplexing (WDM) networks without wavelength converters. Our approach is based on the wavelength decomposition approach in which the WDM network is divided into layers (colors) and the moment matching method is used to characterize the overflow traffic from one layer to another. Analyzing blocking probabilities for unicast and multicast calls in each layer of the network is derived from an exact approach. We assume static routing with either First-Fit or random wavelength assignment algorithm. Results are presented which indicate the accuracy of our method.