Shared risk link groups (SRLG)-aware virtual network mapping in space division multiplexing (SDM) optical networks with multi-mode fibers

As the most promising solution to sustain network capacity scaling beyond the fundamental nonlinear Shannon limits of standard single-mode fibers, space division multiplexing (SDM) has attracted enormous attention. To utilize the dimension of “space”, including mode-division multiplexing (MDM) using multi-mode (few-mode) fibers and core multiplexing using multi-core fibers, SDM can substantially increase the spectral bandwidth of a fiber-optic communication channel. In SDM optical networks, virtual network mapping becomes very complex, because the resource dimension has increased, meanwhile redundant resources and multi-dimensional resource fragments are more difficult to deal with, which will increase the blocking probability and decrease the utilization of spectrum resources. On the other hand, many connection requests with high quality of service (QoS) need physical network to provide high survivability for network resources to resist virtual link or virtual node failure. It determines the physical paths and the appropriate resources that are used to support a virtual network with predefined characteristics. A novel algorithm for the problem of shared backup path protected routing, spectrum and mode allocation (SBPP-RSMA) under dynamic traffic conditions is proposed, so as to protect virtual network and enhance the network resource utilization with lower blocking effectively and increase share ratio of spectrum resources. Finally, performance of our novel algorithm in terms of blocking probability and spectrum utilization is discussed with some simulation results.