RWA in the Presence of Wavelength Conversion in WDM Networks

Blocking probability has been one of the key performance indexes in the design of wavelength-routed all-optical WDM networks. Existing research has demonstrated that an effective Routing and Wavelength Assignment (RWA) algorithm and wavelength conversion are two primary vehicles for improving the blocking performance.. The Weighted least-congestion routing and first-fit wavelength assignment (WLCR-FF) algorithm considers both the current traffic load and the route lengths jointly. In this paper, Numerical study was conducted  over ring  and mesh-torus and NSFNET topology. A comparison was made between WLCR-FF and a wide variety of existing routing algorithms like static routing, fixed-alternate routing and least-loaded routing. The results conclusively demonstrate that the WLCR-FF algorithm can achieve much better blocking performance in the presence of sparse or/and full wavelength conversion.