Crosstalk-aware routing, spectrum, and core assignment based on AoD nodes in SDM-EONs with bidirectional multicore fibers

Inter-core crosstalk causes severe signal impairment in Space Division Multiplexing Elastic Optical Networks (SDM-EON) with multi-core fibre (MCF). In order to mitigate the influence of crosstalk between cores, bidirectional MCF is used. SDM-EON has dramatically increased the network bandwidth and is the mainstream trend of future communications, but the overall cost of such an SDM-EON will increase with traditional hard-connected node structures. On-demand architecture node (AoD) in SDM-EON can dynamically select modes based on incoming services with less cost than traditional node. Although bidirectional multi-core optical fibres can mitigate the impact of crosstalk between adjacent cores, it is still necessary to develop appropriate routing, spectrum, and core assignment strategies to reduce the impact of crosstalk. In addition, the resource allocation strategy will affect the type of on-demand architecture node. This paper develops a core selection method for classified services on a multi-dimensional optical network with bidirectional multi-core fibres. It also proposes an on-demand architecture node suitable for this services classification scheme. According to the proposed core classification method, a routing and resource allocation algorithm that considers the impact of spectrum fragmentation and crosstalk between cores is proposed. The final simulation results prove that the algorithm is beneficial to improve network performance.