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This paper proposes k-regular and k-connected(k&k) structure against multifaults in ultra-high capacity optical networks.Theoretical results show that pre-configured k&k structure can reach the lower bound on logical redundancy.The switching time of k&k protection structure is as quickly as ringbased protection in SDH network.It is the optimal protection structure in ultra-high capacity optical networks against multi-faults.We develop the linear programming model for k&k structure and propose a construction method for k&k structure design.Simulations are conducted for spare spectrum resources effi ciency of the pre-confi gured k&k structure under multi-faults on representative COST239 and NSFnet topologies.Numerical results show that the spare spectrum resources efficiency of k&k structure can reach the lower bound on logical redundancy in static networks.And it can largely improve spare spectrum resources effi ciency compared with p-cycles based protection structure without reducing protection effi ciency under dynamic traffi cs.
This paper proposes k-regular and k-connected (k & k) structure against multifaults in ultra-high capacity optical networks. Theoretical results show that pre-configured k & k structure can reach the lower bound on logical redundancy. The switching time of k & k protection structure is as quickly as ringbased protection in SDH network.It is the optimal protection structure in ultra-high capacity optical networks against multi-faults.We develop the linear programming model for k & k structure and propose a construction method for k & k structure design.Simulations are conducted for spare spectrum resources effi ciency of the pre-confi gured k & k structure under multi-faults on representative COST239 and NSFnet topologies. Numerical results show that the spare spectrum resources efficiency of k & k structure can reach the lower bound on logical redundancy in static networks. And it can substantially improve spare spectrum resources effi ciency compared with p-cycles based protection structure without reducing p rotection effi ciency under dynamic traffi cs.