3Cao X, Anand V, Qiao C. Waveband switching in optical networks[J].IEEE Communication Magazine, 2003,41(4): 105~ 112.
4Harada K,Shimizu K et al. Hierarchical optical path cross-connect systems for large scale WDM networks[J].Proc.OFC, 1999,356~358.
5Lee M. Design of hierarchical crossconnect WDM networks employing a two-stage multiplexing scheme of waveband and wavelength[J]. IEEE. Selected Areas in Communications, 2002,20 (1): 166~171.