Exhaustive Search for Optimal Offline Spectrum Assignment in Elastic Optical Networks

Scheduling-Inspired Spectrum Assignment Algorithms for Mesh Elastic Optical Networks

Spectrum assignment has emerged as the key design and control problem in elastic optical networks. We have shown that spectrum assignment in networks of general topology is a special case of scheduling multiprocessor tasks on dedicated processors. Based on this insight, we develop and evaluate efficient and effective algorithms for mesh and chain networks that build upon list scheduling concepts.

On Spectrum Assignment in Elastic Optical Tree-Networks

Routing, Spectrum, and Transponder Assignment (RSTA) in Elastic Optical Networks

Backbone networks are evolving toward Elastic Optical Network (EON) architecture that allows a flexible and efficient use of spectrum resources. Flexibility in EONs is guaranteed also by emerging sliceable bandwidth variable transponders (SBVTs) that support the simultaneous generation of multiple optical carriers. Such carriers can be used to serve different lightpaths (i.e., slice-ability), o...

Routing and Spectrum Assignment for Constant Bit Rate Connections in Spectrum Sliced Elastic Optical Path Networks

In this paper a heuristic algorithm for finding an optical path in elastic optical path networks is proposed. The proposed algorithm for connection requests finds a spectrum required from an aggregated spectrum of the path belonging to a set of shortest paths measured by the number of links. It has been shown that the proposed algorithm rejects definitely fewer connection requests than the well...

Spectrum Defragmentation in Elastic Optical Networks

Elastic optical networks (EONs) provide fine bandwidth allocation granularity and enable scalable network management. In this paper, we review the strategies to alleviate spectrum fragmentation from both the preemptive and proactive perspectives. As for preemptive defragmentation, we investigate the characteristics of bandwidth fragmentation in EONs, and then discuss a fragmentation-aware routi...