Routing, modulation format, spectrum and core allocation in space-division-multiplexed programmable filterless networks

摘要

Elastic optical networks are considered as promising solutions to improve the spectral efficiency of optical networks and fulfill the diverse bandwidth requirements of heterogeneous network applications. Elastic filterless optical networks with passive broadcast-and-select architecture are introduced to offer network agility. However, the presence of unfiltered signals stems from the signal broadcast and the absence of filtering (socalled drop-and-waste transmission), can lead to an overhead in spectrum usage. This issue can be alleviated by combining the unprecedented flexibility of programmable architecture on demand (AoD) nodes with the extra diversity in spatial domain provided by space division multiplexing (SDM). In this paper, we propose a hardware-aware strategy based on the two-objective binary particle swarm optimization (BPSO) to solve the routing, modulation format, spectrum and core allocation (RMSCA) problem in programmable filterless SDM networks. The proposed BPSO-based hardware-aware RMSCA (BH-RMSCA) strategy aims at minimizing jointly the number of optical couplers and maximum backplane switch size inside the filterless AoD nodes. The physical layer impairment in terms of the inter-core crosstalk (XT) is taken into account in solving the resource allocation problem. Simulation results show that the proposed BH-RMSCA strategy successfully provides Pareto-optimal solutions with remarkable hardware savings compared to the benchmark methods. The cost-efficient network solutions are achieved at the expense of a favorable trade-off with the spectrum usage and the path length, especially for higher connected topology.