Research On Routing Spectrum Allocation And Its Application With Fragment And Crosstalk Awareness In Space Division Multiplexed Elastic Optical Networks

With the continuous growth of various emerging services,network bandwidth traffic has been growing with exponential trend.The Space Division Multiplexed Elastic Optical Network(SDM-EONs)based on multi-core fibers have shown its great promising potentials such as ultra-large capacity and flexible bandwidth allocation,while it still has some shortcomings especially inter-core crosstalk,physical damage,and spectral fragmentation,respectively.Aiming at the routing spectrum allocation method of fragment and crosstalk awareness in SDM-EONs and their applications,this thesis provides in-depth research on these problems through theoretical analysis and experimental simulation.Firstly,this thesis comprehensively analyzes the fundamental principle,basic architecture and key technologies of EONs,introduces the RSA problem in EONs,and focuses on the cross-talk between cores,physical damage and RCSA problem in EONs.Aiming at spectrum fragmentation and physical damage problems,a resource allocation algorithm based on service groupings,inter-core crosstalk and physical damage perception is proposed.By grouping services and partitioning spectrum,different types of services are allocated to corresponding spectrum partitions by group.For services that cannot be transmitted by continuous spectrum channels,hybrid super channel is adopted for transmission.Thus,the frequency spectrum fragments can be reduced and blocking probability can be reduced.Inter-core crosstalk aware is carried out for the services transmitted in the continuous spectrum channel,and the inter-core crosstalk and physical damage of the hybrid super channel are both sensed,thus ensuring the transmission quality of the above services.To solve the problem of spectrum consistency constraint,this thesis proposes a resource allocation algorithm based on sparse allocation of LRSC and core priorities.Firstly,the number of configured LRSC in the network is calculated by the number of nodes and links in the network,and the nodes configured with LRSC are selected according to the intermediary centrality of nodes.After the path is selected according to the path weight and LRSC configuration and the fiber core is allocated according to the priority of the fiber core,the LRSC on the path is used to convert the spectrum of the service that cannot use the idle spectrum to transmit successfully.In this way,the spectrum and conversion scheme that can reach the destination node can be found.In the case of limited cost,the spectrum utilization rate of the network is improved and the spectrum fragments are reduced.