The paper considers the static shared-path protection problem under SRLG (Shared Risk Link Groups) constraint in meshed WDM networks-determining the backup route for each wavelength demand to minimize spare capacity required

given the network topology

traffic matrix and primary routes of all demand.This problem can be formulated as Integer Linear Programming

a NP-C problem

which is computationally intractable for large size of networks.So

we present a heuristic algorithm to address the problem.The key idea of the algorithm is to maximally share the capacity.Simulation results show that the developed scheme effectively reduces the required spare capacity and enhances the network resources utilization.