Inter-Core and Inter-Mode Crosstalk-Avoided Virtual Network Embedding in Spectrally-Spatially Elastic Optical Networks

Abstract

To accommodate the exponential growth of the inter-network services, infrastructure as a service (IaaS) allows the different parties to share the physical infrastructure of the optical network resources using network virtualization. The virtual optical network embedding (VONE) enables efficient resource virtualization to map several virtual optical network (VON) requests over a substrate optical network. On the other hand, the spectrally-spatially elastic optical network (SS-EONs) is becoming a promising solution for the increasing volume of the demanded traffic due to its higher fiber capacity. For the first time, this paper proposes a routing, spectrum, core, and mode allocation (RSCMA) model for VONE over SS-EONs while avoiding inter-core and inter-mode crosstalks. The proposed model allocates spectrum for VON requests over the substrate SS-EONs while maintaining the spectrum continuity, spectrum contiguity, core continuity, and mode continuity constraints. We model the RSCMA model for the VONE problem over SS-EONs as an integer linear programming (ILP) to maximize the number of VON requests placed in the substrate network. We introduce a heuristic when the optimization problem is not tractable for large networks. Numerical results indicate that the performances of the ILP and heuristic approaches are comparable and the computation time of the heuristic approach is much smaller than that of the ILP approach.