Towards realistic planning of WDM transport network

The exponentially growing traffic demands in wide area networks (WANs) can be satisfied by exploiting the huge capacity available in fiber using wavelength division multiplexing (WDM) technique. Given the fact that WDM components are still expensive, it is important to concentrate on optimizing the cost of the WDM-segment to be added to the existing networks. In this paper, a novel algorithm is introduced to solve two problems simultaneously: routing and wavelength assignment (RWA), and network cost optimization. The integrated problem is solved for a given physical topology, traffic demands, restriction on path delay, restriction on the virtual link utilization, maximum number of wavelengths per fiber, and WDM components costs.