Photonic Network Communications

, Volume 28, Issue 1, pp 45–57 | Cite as

Multipath restoration and bitrate squeezing in SDN-based elastic optical networks [Invited]

  • Francesco Paolucci
  • Alberto Castro
  • Filippo Cugini
  • Luis Velasco
  • Piero Castoldi


Sliceable bandwidth-variable transponders (SBVTs) enable the adaptation of transmission parameters according to traffic requirements and network constraints. In this study, SBVTs capabilities are evaluated in the context of restoration. In particular, multipath recovery and bitrate squeezing are applied to maximize the amount of restored bitrate, also exploiting limited portions of spectrum resources along multiple routes. An integer linear programming model and heuristic strategy are proposed. A software defined network (SDN) architecture is then introduced to adequately support the SBVT configuration. The SDN architecture is applied to experimentally assess that the overall re-configuration time upon failure detection is included within two seconds, largely dominated by the proprietary control of bandwidth-variable optical cross-connects. Finally, extensive simulation results show the relevant restoration capabilities achieved by the proposed multipath recovery and bitrate squeezing scheme.


Flexgrid optical networks Software defined network Multipath restoration Bitrate squeezing 



The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 238875 GÉANT (open call REACTION), and from the Spanish Science Ministry through ELASTIC (TEC2011-27310) Project.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Francesco Paolucci
    • 1
  • Alberto Castro
    • 2
  • Filippo Cugini
    • 3
  • Luis Velasco
    • 2
  • Piero Castoldi
    • 1
  1. 1.TeCIP, Scuola Superiore Sant’AnnaPisaItaly
  2. 2.Universitat Politècnica de Catalunya (UPC)BarcelonaSpain
  3. 3.CNITPisaItaly

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