Wavelength requirements in arbitrarily connected wavelength-routed optical networks

Wavelength division multiplexed optical networks using wavelength routing (WRONs) represent the most promising solution for future high-capacity wide-area network applications. One of the crucial factors which will determine their feasibility is the number of wavelengths required to satisfy the network traffic demand. In this paper, we consider arbitrarily connected networks as physical topologies for WRONs. By analysing a large number of randomly generated networks, bounds on the network wavelength requirements are first evaluated as a function of the physical connectivity. The advantages achievable by multifiber connections and the consequence of single link failure restoration are then assessed for several existing or planned network topologies. The results can be used in the analysis and optimization of the WRON design.