Multi-granularity switch technologies decrease the complexity of optical cross connects by employing waveband routing and fiber routing techniques. Compared with the traditional wavelength-routed all-optical networks

the routing and resource assignment problem in multi-granularity networks is more complex because of the appearance of waveband tunnel routing and fiber tunnel routing problems. This paper studies the routing and resource assignment problem for multi-granular all-optical networks. The performance of multi-granular all-optical networks are compared with different node switching ratios

Moreover

the optimal waveband granularity of multi-granularity optical cross connect （MG-OXC） are analysed under different traffic loads and also the performance of multi-granular all-optical networks has been analysed based on economic factors.