Author : Sridhar Iyer 1
Date of Publication :14th April 2017
Abstract: In recent years, with introduction of elasticity (flexibility) in optical networks, bandwidth utilization can be adjusted as per the requests and also, longer transmission reach and higher spectral-efficiency can be provisioned. In view of optical transmission, elastic optical networks (EONs) resort to the use of elastic frequency grids and advanced modulation formats which necessitate solutions to the novel routing and spectrum allocation (RSA) approaches. In the current work, we compare various dynamic dual step RSA approaches applicable to the EONs. Specifically, we analyze and compare various (i) k-shortest path based approaches for the routing step, and (ii) approaches for the spectrum allocation step. Our simulation results demonstrate (i) effectiveness of the RSA approaches in regard to the considered network topologies which utilize the connections’ demanded bandwidth, and (ii) improvement in the shortest path first approach’s performance with an increase in candidate route’s numbers for a network with higher numbers of nodes and links.
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