Research And Simulated Implementation For Grooming Protection Algorithm Based On Power Efficiency In WDM Optical Network

Wavelength Division Multiplexing (WDM) technology has the advantages of large capacity for system transmission, strong network reliability, and bandwidth resources conservation etc. Based on this technology, IP over WDM network is developed and has become the focus of the future broadband network research. In recent years, with the global resources shortage and greenhouse effect deterioration, how to reduce power consumption effectively in networks under the premise of guaranteeing the quality of service becomes an urgent matter. In IP over WDM etwork, given the traffic grooming matrix, the usage of power-intensive network components can be reduced effectively by reasonable design of virtual topology so as to achieve the target of reducing power consumption. Meanwhile, optical network carries large capacity of information, which leads to huge economic loss if failures happen and can not be repaired in time. Therefore, optical network survivability has attracted more and more attention.This thesis mainly focuses on the problems of power efficiency and survivability in WDM optical network. Based on the constructed power efficiency model, this thesis proposes two kinds of grooming protection algorithms based on power efficiency: Single-hop Grooming Protection Algorithm based on Power Efficiency (SGPAPE) and Multi-hop Grooming Protection Algorithm based on Power Efficiency (MGPAPE). Both of the two algorithms firstly construct wavelength integrated auxiliary graph, and then find routing path and allocate bandwidth resources on the graph by using traffic grooming technology and optical bypass technology. The difference is that SGPAPE can only find paths on VTL and WPLs while MGPAPE can find paths by means of multiple hops consisting of wavelength links, VTL links and virtual links besides the ways adopted by SGPAPE.To evaluate and test the performances of the two algorithms, this thesis develops the simulation through the VC++6.0 software. Simulation results show that the overall performances of MGPAPE algorithm are superior to SGPAPE algorithm, and MGPAPE algorithm has good power saving effect.