Fast service recovery under shared protection at connection level in WDM grooming networks

In this paper, a novel algorithm optimizing the utilization of backup path resources for survivable WDM mesh grooming networks, based on graph vertex-coloring approach, is proposed. This is the first optimization technique, dedicated to protection-at-connection level (PAC) in WDM grooming networks, such that does not increase the backup path length and thus provides fast service recovery. The concept was evaluated for the U.S. Long-Distance Network and European COST 239 Network. The results show that, with only a little degradation of link capacity utilization efficiency (up to 8%), up to 20% shorter average values of service recovery time can be achieved.