Assessment of Blocking Performance in WDM Networks with Wavelength Interchange

In this paper, we investigate the influence of wavelength interchange on the blocking performance of WDM networks with ring, mesh-torus and hypercube topologies. It is shown that in rings, the difference between blocking probabilities, with and without wavelength interchange in all nodes, is small but increases as the number of wavelengths increases. However, these differences become smaller as the number of nodes increases. In mesh-torus and hypercube networks, the difference between blocking probabilities, with and without wavelength interchange in all nodes, also increases with the number of wavelengths but, unlike rings, the difference between these blocking probabilities increases with increasing number of nodes. I