The elastic optical networks have shown promise for future of optical communications supporting high transmission rates data. To meet high transmission rates, you need to solution RMLSA (Routing, Modulation Level, Spectrum Assignment) problem which is to select a route, choose a modulation level and a range of free spectrum. A new algorithm called Circuit Interference Reduction - Minimum Allocation Slots (CIR-MAS) is presented in this work. This algorithm seeks to select a modulation format that is more resistant circuit interferences (established circuits on the networks). Also it selects a route with the minimum allocation slots among the alternative routes, in order to reduce the blockage caused by degradation of circuits. The performance of the CIR-MAS algorithm was evalueted on the NSFNet and EON topologies by comparing with the following algorithms: K-Shortest Path Computation (KS-PC), Modified Dijkstra Path Computation (MD-PC) and K-Shortest Path with Reduction of QoTO (KSP-RQoTO), wich have already been presented in the literature. The CIR-MAS algorithm presented a minimum gain of 40.5% in terms of circuit blocking probability, and in terms of bandwidth blocking probability, it obtained a minimum gain of 37.5% when compared all competing algorithms.
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