Abstract: The characteristics of connections in waveband switching (WBS) optical network are analyzed, and a new dynamic routing and wavelength assignment algorithm suitable for WBS network is proposed, which is called the longest waveband path (LBP) algorithm. In order to effectively save network cost and reduce network blocking probability, LBP algorithm tries to use three ways with different priorities to set up a new wavelength connection, which are using the longest established waveband path, establishing a new end-to-end waveband path and establishing a step-by-step wavelength path. In this paper, the blocking performances of WBS network are compared with different node switching ratios and different routing methods using LBP algorithm. Moreover the optimal switching ratios of multi-granularity optical cross connect (MG-OXC) are analyzed under different traffic loads. These results are instructive for the design of WBS network.

Key words: waveband switching, multi-granularity node, dynamic routing and wavelength assignment