Abstract
With the introduction of elasticity in optical networks, the bandwidth utilization can be adapted according to the demands and further, longer transmission reach and higher spectral-efficiency can also be provisioned. For transmission, the elastic optical networks (EONs) use flexible frequency grids and advanced modulation formats, which necessitates solutions to the routing and spectrum allocation methods. Existing studies on EONs assume the transmission reaches of considered modulation formats to be based on various factors. In the current work, the effect of transmission reach(s) of considered modulation format(s) on spectrum utilization in the EONs is investigated. The optimization problem is formulated as an integer linear program, and a heuristic algorithm is proposed to obtain solutions to the problem. Further, extensive simulations are conducted, considering realistic assumptions and network topologies, and the obtained results demonstrate that the spectrum utilization in EONs is significantly affected by the considered modulation format’s transmission reach; however, the considered network topology’s size substantially affects the nature of the obtained results.
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