Traffic Grooming And Routing And Wavelength Assignment (RWA) In Optical WDM Satellite Networks

As data traffic on the satellite network increases sharply, traditional microwave satellite network can barely provide sufficient bandwidth for the data traffic. Using multi-gigabit laser intersatellite links( ISLs) in the low earth orbit( LEO) satellite network can greatly improve the bandwidth of the satellite network to meet the growing need of customers. In this thesis, we consider the wavelength division multiplexing( WDM) optical satellite network. Extending the existing studies on the traffic grooming and routing and wavelength assignment( RWA) problems in the terrestrial IP over WDM optical network, we evaluate the performance of single-hop and multi-hop lightpath bypass traffic grooming for the WDM optical satellite network. For the lightpath traffic demand obtained by the traffic grooming process, we also compare the performance of the RWA algorithms that are based shortest-path routing and waveplane-based routing. Through simulation studies, we find that multi-hop traffic grooming and waveplane-based RWA algorithm can not only require the minimum number of wavelengths, but also achieve the shortest end-to-end average delay for IP traffic. Meanwhile, considering the importance of network survivability to the optical satellite network, we also apply the 1+1 path protection and shared backup path protection( SBPP) techniques to optical satellite network. the simulation results show that the SBPP technique can achieve much higher network capacity efficiency than the 1+1 path protection technique.