We present a heuristic method to optimize the capacity of a WDM mesh network assigning working and protection capacity to a set of static optical-connection requests under the linkdisjoint constraint. The method can be applied to networks supporting either dedicated or shared path-protection. Routing and fiber and wavelength assignment (RFWA) are jointly performed for all the lightpaths with the aim of minimizing the number of fibers in the network. The employment of multiple prioritized heuristic criteria and an efficient link disjoint paths search algorithm are proposed. With less computational effort, the proposed heuristic approach allows to obtain good suboptimal results compared to the exact integer-linear-programming optimization. After introducing our design approach, we discuss the optimization of particular case-study networks under various condition and compare the results. Index Terms-Wavelength Division Multiplexing, optical fiber communication, planning, protection0-7803-7476-2/02/$17.00 (c)

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Failure-protection ofWavelength Division Multiplexing networks is a hot researchtopic today. In this paper we focus on optical path protection in multifiber mesh networks. We present a heuristic method to assign working and protection capacity to a set of static optical-connection requests under the path-disjoint constraint. Routing, fiber and wavelength assignment are jointly perfmmed for all the lightpaths with the aim of minimizing the number of fibers in the network The proposed heuristic approach allows to obtain good suboptimal results compared to the exact integer-linear-programming optimization. We discuss the optimization of particular case .. study networks in order to analyze the influence of different link-disjoint-path search algorithms on the final results and of various design critelia.

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