A crosstalk-consideration spectrum assignment algorithm in SDM-EONs based on exact multi-flow strategy

One of the core challenges of space-division-multiplexed elastic optical networks (SDM-EONs), as a cutting-edge technology for future optical backbone networks, lies in efficiently dealing with the complexities of routing, modulation, spectrum and core allocation (RMSCA). In this framework, spectrum fragmentation and inter-core crosstalk become the key constraints on network performance. In this paper, we innovatively propose a crosstalk representation and design dynamic spectrum fragmentation optimization and accurate combinatorial shunt optimization algorithms. These algorithms effectively mitigate the spectrum fragmentation problem by intelligently integrating the abandoned spectrum fragments in the network. Simulation verification shows that the two algorithms proposed in this paper exhibit significant advantages in significantly reducing the bandwidth blocking probability.