Abstract

Protection design is a key issue for provisioning survivable multicast sessions in wavelength-division-multiplexing (WDM) optical networks. Most existing algorithms focus on protecting multicast sessions in full-splitting WDM networks. To reduce network cost, the sparse-splitting concept was introduced. We study the problem of shared multicast protection in sparse-splitting WDM networks and propose an efficient shared protection algorithm called shared sparse-splitting constrained multicast protection (SSSMP) algorithm. With sparse-splitting constraint, the backup paths cannot share wavelengths with primary tree (self-sharing) in some cases. To achieve self-sharing, we develop a two-layered auxiliary graph model. To further save wavelength resources, we also consider spare capacity sharing within different backup paths. Simulation results show that SSSMP has better performance in terms of wavelength resource utilization and blocking probability than existing algorithms.

© 2008 Optical Society of America

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