关键词: 混合光交换网络（c-HyLabs）, 光多播, 光突发交换, 光电路交换

Abstract: There are two all-optical multicast schemes in WDM networks：One is light-tree based multicast in OCS（Optical Circuit Switching） networks，and another is packet based multicast in OBS（Optical Burst Switching） networks.However，both of them have disadvantages.This paper analyzes the disadvantages of the OCS and OBS multicast schemes；and then proposes a Hybrid optical switching network called c-HyLabs（Cycle based Hybrid Light-path and Burst Switching），and proposes an efficient multicast scheme on c-HyLabs.Simulation demonstrates that the c-HyLabs multicast scheme performs better than OBS multicast scheme in terms of packet loss probability and packet latency.

Key words: Cycle based Hybrid Lightpath and Burst Switching（c-HyLabs）, WDM multicast, Optical Burst Switching（OBS）, Optical Circuit Switching（OCS）