Load distribution-survivable lightpath routing for the optical virtual private network

The optical virtual private network (OVPN) services are expected to be one of the major applications in the future optical networks. To establish the OVPN, the lightpaths (virtual connections) are layout through the provider optical network element and finally connected to the client edge devices. Service reliability is one of the major requirements in the OVPN design. We propose a mathematical model for an efficient lightpath routing called load distribution-survivable lightpath routing (LD-SLR) which can mitigate the impact of the failure disruption in the OVPN by introducing the load distribution concept to the survivable lightpath routing. Our results show that the LD-SLR produces an efficient lightpath routing for both sparse and dense virtual network design compared to other lightpath routing models in literature.