RWA Based Optimal Placement of Wavelength Converters in WDM Optical Networks

Wavelength Converter (WC) placement in WDM optical network is essential when traffic demand and resource requirement is higher. As the number of WCs increases the blocking of the connection reduces. However, random placement is undesirable since placement of WC at certain nodes reduces blocking probability at higher extent. Random placement not only results in wastage of resources but also put hurdles in wavelength usability. We have investigated that the nodes to be selected for WC placement depends on Routing and Wavelength Assignment (RWA) strategies. Hence, we have proposed an ordered set of optimum node positions of WCs in the network. In addition, we propose that the optimum solution is different for different RWA strategies. We propose that the sequence of optimal positions is common for respective RWA for any number of WCs. We have also proposed that every RWA has different requirement of nodes deployed with WCs.