Strategies for Wavelength Assignment in WDM Optical Networks

WDM optical networks are high speed networks and provide very high capacity to transmit the data. It establishes communication between pairs of nodes and assign wavelength to each path. Routing and wavelength assignment (RWA) is the problem to select a suitable path and wavelength among the many possible choices for each connection such that maximize the connection established and minimize the blocking probability using limited resources. This paper proposes the analyses of some strategies to solve wavelength assignment problem for different topologies. We study how the performance, in terms of blocking probability, depends on the number of hop per connection and the number of wavelength per optical fiber. We also evaluate the performance of regular network topologies: centralized switch and mesh topology, for wavelength conversion and non wavelength conversion.