Intentional spectrum waste to reduce blocking probability in space division multiplexed elastic optical networks

Abstract Space division multiplexed-elastic optical networking (SDM-EON) is proposed to provide capacity and flexibility for future optical transport networks. The resource allocation problem of SDM-EON includes the route, space, and spectrum assignment (RSSA). One of the flexibilities brought out by SDM-EON is space and spectrum assignment layout (SAL) variety. In this paper, we propose intentional spectrum waste (ISW) approach to provide SAL variety in the resource allocation. Then, we investigate the effect of SAL variety on the resource allocation of SDM-EON in three different networking scenarios. To do so, we first define spectrum waste metric for each SAL as an indicator to choose the best possible SAL for resource allocation. Moreover, we propose three different heuristic algorithms called spectrum waste base (SWB) algorithm, ISW with sequential approach (ISW-S) algorithm, and ISW with accumulative approach (ISW-A) algorithm. The simulated results prove the usefulness of spectrum waste metric. Also, the ISW-S and ISW-A algorithms show improvements on the blocking rate for all the networking scenarios.

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