ABSTRACT
Elastic optical networks (EONs) carry highly reliable traffic and failure of any component or any interruption of traffic flow in network causes massive loss of data and revenue. This chapter presents defragmentation schemes in 1+1 path protected EONs to suppress the call blocking in the network. The chapter discusses a heuristic algorithm for the dynamic spectrum defragmentation. The input spectrum is the state at the moment the defragmentation process is triggered. The chapter analyzes the time and spatial complexities of the mixed primary and backup heuristic algorithm. It evaluates the performances of the presented defragmentation approach based on path exchanging in terms of blocking probability in the 1+1 protected EONs. EONs carry sensitive information and any interruption of the data flow leads to massive data loss. Since optical fibres are subject to impairments, such as being cut, providing network with protection is imperative.
