A joint working and protection path selection approach in WDM optical networks

In survivable WDM optical networks, one of the critical issues is route computation. Although there is a possibility to optimize the route computation (together with the wavelength assignment) for static traffic pattern, it is impossible to perform such optimization for incremental and dynamic traffic. The conventional approach first computes the working path and then computes an edge-disjoint protection path using the shared risk link groups (SRLGs) information of the working path. In this paper, we propose a joint working and protection path selection approach. Our approach tries to find multiple pairs of candidate working and protection paths. Then the pair with the minimum cost sum is selected. We have evaluated the performance benefit gained from the joint path selection approach with a single service class dynamic traffic supporting 1:1 protection scheme.