Experimental demonstration of a GMPLS-enabled impairment-aware lightpath restoration scheme

Jordi Perelló, Salvatore Spadaro, Fernando Agraz, Marianna Angelou, Siamak Azodolmolky, Yixuan Qin, Reza Nejabati, Dimitra Simeonidou, Pannagiotis Kokkinos, Emmanouel Varvarigos, Ioannis Tomkos

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)


Fast lightpath restoration becomes particularly challenging in all-optical networks. First, the optical transparency complicates failure localization and isolation procedures, as loss of light alarms stemming from a failure propagate downstream from the failure point. Besides, such a transparency implies that optical signals must traverse relatively long distances without electrical regeneration. In view of this, backup path computations must also account for all degradations introduced in the physical end-to-end path, thus ensuring their feasibility. Looking toward the optical core networks of the future, the EU DICONET Project has worked on cross-layer solutions to enhance network control and management with the impairment-awareness needed to govern the underlying optical layer. This includes a network planning and operation tool (NPOT) that implements impairment-aware routing and wavelength assignment algorithms, along with a failure localization mechanism. This paper reports the experimental demonstration of a dynamic impairment-aware restoration scheme that benefits from enhanced NPOT features for fast lightpath restoration. To this end, a prioritized scheduler to provide differentiated resilience support, the implementation of the quality of transmission estimator module on field programmable gate array hardware, and a fast resource pre-reservation protocol are presented in this work. The performance of the proposed impairment-aware lightpath restoration scheme has been evaluated experimentally on a 14-node all-optical network test-bed, showing average restoration times of 1.16 and 1.64 s for high and low priority traffic classes, respectively.

Original languageEnglish
Article number6226958
Pages (from-to)344-355
Number of pages12
JournalJournal of Optical Communications and Networking
Issue number5
Publication statusPublished - May 2012
Externally publishedYes


  • Failure restoration
  • Impairment-awareness
  • Optical networks
  • Transparency

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