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Shared-path protection algorithm with differentiated reliability in meshed WDM networks

Optical fiber links, due to sharing some common physical resources, e.g., fiber cable, conduit and Right of Way, have certain failure-dependent. The term "Shared Risk Link Groups (SRLG)" is introduced to describe the relationship between links with shared risk; SRLG diversity has become the important constraint of protection design problem. This paper addresses SRLG-constraint-based shared-path protection design problem with differentiated reliability. Via SRLG conditional failure probability concept, we propose an efficient PSD-SPP (Partial SRLG-disjoint Shared-Path Protection) algorithm to solve the protection design problem with differentiated reliability under the consideration of links failure-dependence. Simulation result shows that this algorithm not only efficiently satisfies the user-specific requirement, but also effectively decreases the network-blocking ratio.