A Spectrum Allocation Algorithm Based on Threshold to Reduce Crosstalk

The space division multiplexing based elastic optical network (SDM-EON) can flexibly allocate bandwidth according to the volume of service requirements. And multiple core fiber support great increasements of network capacity simultaneously. Considering the physical damage of the transmitted signal in multi-core fibers (MCF) due to the crosstalk among different cores, it is one of the most important problems for application of SDM-EON. In order to effectively solve the problem of crosstalk, this paper proposes an improved strategy that the services occupying fewer frequency slots can be preferentially allocated to the intermediate core when the traffic load is high, and a modified spectrum allocation algorithm based on frequency slot threshold reduction of crosstalk perception. Theoretical analysis and simulation results proves the improved algorithm can obtain better blocking probability and crosstalk performance.