OPN07-2: Complementary Protection Under Double-Link Failure for Survivable Optical Networks

In previous protection schemes against random double-link failure scenarios, two link-disjoint backup paths are provided for each connection. However, the protection domains (protected double-link failure scenarios) of the two backup paths are not optimized, i.e., they overlap, such that the two backup paths of a connection will protect the same double-link failure scenarios. This will waste a large amount of backup bandwidth. In this paper, we present a novel complementary protection scheme. The two backup paths of each connection will complementarily protect the connection so that the protection domains of each connection are optimized. The path selection and the bandwidth allocation are thus optimized. The mathematical model of complementary protection and the resource allocation/release heuristic algorithm are given. Simulation results show that our algorithm has better performance in terms of total bandwidth consumption and blocking probability under double-link failure scenarios, meanwhile, our algorithm has fast on-line characteristic for dynamic connections.