Blocking performance of cost efficient integrated OTN/WDM metropolitan networks in static traffic scenario

Abstract

We propose a low complexity and integrated OTN/ WDM switching architecture for metropolitan networks and realized in electronic technology. The proposed switch is scalable and composed by small capacity OTN switches and one space switch. The architecture reduces the number of OTN switches with respect to other solutions proposed in literature with the consequence of optimizing the used OTN switching resources and the complexity of the space switch. To study the impact on the blocking performance of the reduced number of OTN switches, we introduce an Integer Linear Problem that models the routing and switch resource assignment problem in a network equipped with the proposed switches. Being the problem NPhard, an heuristic is proposed to evaluate the network request blocking in static traffic scenario. The obtained results show how a reduction in OTN switches to as small as 50% can be reached when the percentage of traffic needing sub-wavelength switching is 40%.