Efficient routing and spectrum allocation considering QoT in elastic optical networks

In recent years, OFDM-based elastic optical network (EON) has drawn a lot of attention in both academia and industry. Compared to traditional optical wavelength division multiplexing (WDM) network, EON is capable of supporting variable data rate, accommodating traffic demands flexibly, and utilizing spectrum more efficiently. Accordingly, the resource management in EON is different from that in WDM networks and addresses new challenges in network design and control. In this paper, we study the routing and spectrum allocation (RSA) problem in EON. We propose an efficient link-based mixed integer linear programming (MILP) model with the objective to optimally utilize the spectrum resources while considering the Quality of Transmission (QoT). Then the performance of the proposed model is examined through a case study.