Multilayer flex-grid network planning

P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos

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11 Citations (Scopus)


The traffic in metro and core networks is forecasted to grow in volume but also in dynamicity, and the inefficiency of WDM optical networks drove research efforts on flex-grid technologies. Flex-grid networks support variable spectrum connections as a way to increase spectral efficiency and support future transmission rates. In addition, the use of flexible transponders further increases the flexibility of such networks, bringing closer the optical and the IP layers. The joint planning and operation of both layers becomes crucial to reduce the capital and operational costs. To this end, in this paper we examine the planning problem of a multilayer (ML) flex-grid network from the perspective of capital expenditure taking into account modular IP/MPLS routers at the optical network edges along with tunable optical transponders. We propose a concise ILP formulation that jointly solves the ML planning problem. The formulation is quite generic and can be used for flex- and fixed-grid networks employing flexible or fixed transponders.

Original languageEnglish
Title of host publicationConference Proceedings - 2015 International Conference on Optical Network Design and Modeling (ONDM)
EditorsFilippo Cugini, Tibor Cinkler, Pablo Pavón Mariño
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9783901882722
Publication statusPublished - 17 Jun 2015
Externally publishedYes
EventInternational Conference on Optical Network Design and Modeling 2015 - Scuola Superiore Sant'Anna - TeCIP Institute, Pisa, Italy
Duration: 11 May 201514 May 2015
Conference number: 19th


ConferenceInternational Conference on Optical Network Design and Modeling 2015
Abbreviated titleONDM 2015
Internet address


  • Cost efficiency
  • Flex-grid
  • ILP
  • IP over flexible (elastic) optical networks
  • IP over WDM
  • Planning

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