Reseaarch On Multi-failure Multi-layer Optimization In Survivable Elastic Optical Networks

With the rapid growth of Internet services,the demand for network bandwidth has increased rapidly.Wavelength division multiplexing(WDM)networks using fixed spectrum grids for spectrum allocation have been unable to meet the high data rate,long distance,super-channel and other requirements of future optical networks.Therefore,elastic optical networks(EON)with higher spectrum allocation flexibility and resource utilization become a focus of attention in optical networks.This research focuses on elastic optical networks,combined with network survivability techniques,and conducts in-depth research on multi-failure protection and multi-layer optimization.Considering the limitations of only considering single-failure in a survivable optical network,this study extends the FIPP p-Cycle network protection technique for dual-failure network protection.Based on different dual-failure protection scenarios,we build an integer linear programming(ILP)model to minimize the network backup capacity.With the guarantee of dual-failure network protection,the model can achieve optimal allocation of spare resources on the network links.Simulation results show that networks with FIPP p-Cycle dual-failure protection technique achieve lower spare capacity redundancy and faster recovery speed than other dual-failure protection techniques such as 1+1:1 and 1:1:1 network protection techniques.Combining the two requirements of sub-wavelength service traffic grooming and network survivability of elastic optical network,this paper develops a research on sub-wavelength service traffic grooming that supports network survivability based on IP over EON.Considering network protection resource sharing across the IP and EON layers,we developed a heuristic algorithm to optimize signal regeneration and traffic grooming jointly,which realizes the protection of the IP layer service while minimizing the network cost.The simulation results show that the heuristic algorithm proposed can not only significantly reduce the cost of regenerators and transceivers in the network,but also improve the utilization of network spectrum resources.