Multi-layer Model for Optical Multicast over WDM Networks

Optical multicast is usually modeled as a two-step process: multicast routing and wavelength assignment. This paper proposes a new multi-layer model, in which the WDM network is represented as a multilayer wavelength structure, each of which has finite capabilities, to integrate routing and wavelength assignment. The algorithm makes use of the light splitting and wavelength conversion capabilities simultaneously in a deterministic manner, avoiding the re-routing procedure. It handles the finite light splitting capability, thus providing a general solution to the problem. Some simulations results are presented in the paper.