Models, complexity and algorithms for the design of multifiber WDM networks

A. Ferreira, S. Pérennes, A. W. Richa, H. Rivano, N. Stier Moses

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


We study multifiber optical networks with wavelength division multiplexing (WDM). Assuming that the lightpaths use the same wavelength from source to destination, we extend the definition of the well-known wavelength assignment problem (WAP), to the case where there are k fibers per link, and w wavelengths per fiber are available: This generalization is called the (k, ω)-WAP. We develop a new model for the (k, ω)-WAP, based on conflict hypergraphs: conflict hypergraphs more accurately capture the lightpath interdependencies, generalizing the conflict graphs used for single-fiber networks. By relating the (k, ω)-WAP with the hypergraph coloring problem, we prove that the former is NP-complete, and present further results with respect to the complexity of that problem. We consider the two natural optimization problems that arise from the (k, w)-WAP: the problem of minimizing k given w, and that of minimizing w given k. We develop and analyze the practical performances of two methodologies based on hypergraph coloring, one for each of the two optimization problems, on existing backbone networks in Europe and in the USA. The first methodology relies on two heuristics based on a randomized approximation algorithm and the second consists on an integer programming formulation.

Original languageEnglish (US)
Title of host publication10th International Conference on Telecommunications, ICT 2003
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Electronic)0780376617, 9780780376618
StatePublished - 2003
Event10th International Conference on Telecommunications, ICT 2003 - Papeete, Tahiti, French Polynesia
Duration: Feb 23 2003Mar 1 2003

Publication series

Name10th International Conference on Telecommunications, ICT 2003


Other10th International Conference on Telecommunications, ICT 2003
Country/TerritoryFrench Polynesia
CityPapeete, Tahiti


  • Algorithm design and analysis
  • Approximation algorithms
  • Europe
  • Optical fiber networks
  • Optimization methods
  • Performance analysis
  • Spine
  • WDM networks
  • Wavelength assignment
  • Wavelength division multiplexing

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Computer Science Applications


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