Routing and Wavelength Assignment Strategy in Distributed Multi-Domain DWDM Network

As the distributed multi-domain DWDM optical network has been advocated to be the next generation optical network, there is a pressing need to address the inter-domain RWA (Routing and wavelength assignment) problem. Thus, we propose a set of new inter-domain RWA schemes, including a MLP (Most leisure path) routing strategy based on the Hybrid abstraction and a ID-MU (Inter-domain most used) wavelength assignment algorithm based on the MU assignment algorithm. The proposed schemes are tested by a simulation network which is very close to practical distributed DWDM network. The result proves that the combination of MLP and the ID-MU could effectively reduce both the intra and the inter domain blocking probability, and the ID-MU could also optimize the wavelength utilization.