Analysis and design of resilient multifiber wavelength-routed optical transport networks

Wavelength-routed optical networks (WRON's) are attracting significant atte ntion for future high-capacity transport applications. This paper studies r esilient multifiber WRON's, investigating the influence on the network perf ormance of the maximum number of wavelengths per fiber TY restoration strat egies, node functionality, and physical topology, Fiber requirements are an alyzed for numerous network topologies both without and with link failure r estoration, considering different optical cross-connect (OXC) configuration s and terminal functionalities. An integer linear program (ILP) formulation is presented for the exact solution of the routing and wavelength allocati on (RWA) problem, with minimal total number of fibers, F-T(W). Lower bounds on FT(W) are discussed, and heuristic algorithms proposed. Three restorati on strategies are considered and compared in terms of capacity requirement. Different network topologies are analyzed, to evaluate the influence of ph ysical connectivity and network size on the restoration capacity. Network e volution in terms of growth in traffic demand is investigated to study the importance of wavelength conversion within the OXC's as a function of netwo rk size and connectivity, traffic demand, and wavelength multiplicity W.