Load balanced sub-path protection with restoration time constraints in optical networks

Since each wavelength channel has the transmission rate over several gigabits per second, the failures of fiber links may lead a lot of services to be blocked. Therefore, the survivability has emerged as one of the important issues in the design of wavelength-division-multiplexing optical networks. Based on the concept of protection, this paper gives a new algorithm named mixed sub-path protection that computes one working path and one link-disjoint protection path (or two sub-protection paths) with considering the load balanced routing and the restoration time constraints for each connection request. Simulation results show that compared with the traditional algorithms, our proposed algorithm can obtain lower blocking probability as the restoration time can be satisfied.