New dynamic grooming approaches for multicast traffic in meshed wavelength-division-multiplexing networks

Abstract

Optical layer multicast refers to the support of point-to-multipoint connections directly at the physical layer by employing passive devices known as power splitters. Since the bandwidth requirement of an individual user is only a fraction of optical channel capacity, traffic grooming problems are becoming a crucial constituent in designing wavelength-division-multiplexing (WDM) networks. This work proposes a new efficient multicast traffic grooming algorithm (EMGA) in the dynamic scenario based on an auxiliary grooming graph. The layered auxiliary graph represents the current network resource state and is modified adaptively, based on which multicast routing and wavelength assignment can be realized at the same time. Simulation results show that, under different network loads, the EMGA has lower traffic blocking probability and good network resource utilization with the constraints of wavelength continuity, and limited wavelengths and transceivers.