A procedure of wavelength rerouting in optical WDM networks

Wavelength rerouting procedure is one possible approach for improving the available bandwidth utilization in optical WDM networks employing wavelength routing technique. In this procedure, a wavelength continuous route for a new lightpath that needs to be established is created by assigning new wavelengths to few existing lightpaths while retaining their routes. The benefits of wavelength rerouting technique are researched in this paper. For this purpose, we developed the software for wavelength rerouting simulation. A simulation is performed and illustrated for an optical WDM network with nine nodes and mesh topology. Results show that network performances in terms of lightpath blockings could be improved when using rerouting technique.