Integrated VONE Scheme Over Resource-Virtualized Elastic Optical Networks

Abstract

To eliminate the ossification of optical infrastructure and adapt to the high-performance Internet applications, optical network virtualization is an important enabler to offer each application type a dedicated virtual optical network (VON). It can provide resource sharing for multiple VON requests on an optical infrastructure, and promise efficient use of network resources. In the paper, we first introduce a new concept of resource-virtualized elastic optical network (RvEON), which not only realizes link-tier spectrum virtualization in each substrate fiber link (SFL), but also node-tier virtualized transponders (vTPs) within each substrate node (SN). The RvEON can be considered as a very promising optical infrastructure for multiple VON requests. We then propose a novel integrated virtual optical network embedding (iVONE) scheme over RvEONs. For the iVONE, the node mapping and link mapping are performed in an integrated way, which is totally different from all existing two-phased VONE schemes. In the RvEONs, a novel integer linear programming (ILP) model is formulated, which additionally takes into account the subcarrier and modulator resource constraints of the virtualized TPs. Meanwhile, a novel routing, modulator, spectrum and subcarrier assignment (RMS 2 A) algorithm is designed to establish lightpaths for virtual link mapping in the RvEONs. The simulation results demonstrate that our proposed RMS 2 A algorithm achieves better performance than the existing benchmark two-phased algorithm. We also investigate the impact of bit-rates of the VON requests and the different configurations of various modulators that each vTP can offer on the network performances, respectively. INDEX TERMS Elastic optical networks, network resource virtualization, virtual optical network embedding, virtualized transponder.