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Routing and wavelength assignment in all optical networks to establish survivable lightpaths

In WDM optical networks, it is critical that lightpaths are routed in a way that a single link failure would not disconnect the network. We call such a routing survivable and develop algorithms for survivable routing of a logical topology. We studied an integer linear programming (ILP) formulation for the complete virtual topology design, including choice of the constituent lightpaths, routes for these lightpaths, and survivability.