9 Restoration in the Optical Layer
Alberto Castro1, Lluís Gifre2, Marc Ruiz2 and Luis Velasco2
1 University California Davis, Davis, CA, USA
2 Universitat Politècnica de Catalunya, Barcelona, Spain
In this chapter, we explore point‐to‐point connection recovery schemes specifically designed for Elastic Optical Networks (EONs), in particular taking advantage of sliceable bandwidth variable transponders (SBVTs) that provide additional flexibility allowing reconfiguration of optical connections to be performed. The bitrate squeezing and multipath restoration (BATIDO) problem is proposed to improve restorability of large bitrate connections. BATIDO aims at maximizing the amount of restored bitrate by exploiting the available spectrum resources along multiple routes. BATIDO is formally stated and next modeled using an Integer Linear Programming (ILP) formulation. As a result of the stringent time to compute a solution, a heuristic algorithm providing a better trade‐off between optimality and complexity is proposed to solve the problem. Extensive simulation results show the relevant restoration capabilities achieved by the proposed multipath recovery and bitrate squeezing scheme. Next, the BATIDO problem is extended by considering modulation formats and transponder availability. An algorithm to solve the modulation format‐aware restoration (MF‐Restoration) problem is presented and a workflow to implement MF‐Restoration in the Application‐based Network Operations (ABNO)‐based architecture ...
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