Survivable Virtual Network Mapping in Filterless Optical Networks

Today's optical networks must meet the unprecedented capacity requirements of 5G communications and provide such capacity under strict cost constraints. Filterless Optical Networks (FONs) (i.e., optical networks where optical nodes are solely based on passive splitters and combiners) are emerging as an outstanding solution to reduce network cost while supporting capacity growth. Due to FONs' specific design criteria (the network topology must be divided into edge-disjoint filterless fiber trees), traditional network problems, such as, e.g., routing and wavelength assignment and virtual network mapping, shall be tackled adopting distinct approaches with respect to state-of-the-art filtered optical networks networks. In this paper, we investigate the problem of survivable virtual network mapping (SVNM) in FONs. We propose an Integer Linear Programming model to establish fiber trees and provide survivable mapping of virtual networks, while minimizing cost of additional equipment and spectrum. We show that joint optimization of filterless trees and survivable mapping significantly decreases transceivers and spectrum cost compared to a disjoint solution where the tree establishment does not consider SVNM constraints.