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In recent years, Orthogonal Frequency Division Multiplexing (OFDM)-based elastic optical network (EON) has drawn increasing 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 with finer provisioning granularity, 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, modulation level and spectrum allocation (RMLSA) 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 constraint on Quality of Transmission (QoT). Then, the performance of the proposed model is evaluated and analyzed through case study.

Efficient Routing and Spectrum Allocation Considering QoT in Elastic Optical Network