On optimal routing and spectrum allocation in elastic optical networks

With the development of science, technology and society, the demand for global communication bandwidth has been greatly increased, and it is difficult for traditional optical fiber networks to meet this growing bandwidth demand. In this context, elastic optical networks (EONs) have received a lot of attention from research and industry due to their allocation flexibility and efficient utilization. Among them, the complex routing and spectrum allocation (RSA) problem is one of the main problems currently studied in EONs, mainly to improve the efficiency and flexibility of different service transmissions by allocating a continuous number of sub-carriers. In this paper, a new variant of the RSA problem is proposed and a more concise integer linear programming formulation of the RSA problem is provided. Experiment results demonstrate that the proposed approach can achieve the expected results and substantially increase the bandwidth capacity of the network.