Cost-reduction using non-uniform traffic in optical networks

Farsheed Farjady, N.J. Doran

Research output: Chapter in Book/Published conference outputConference publication


Next-generation networks are likely to be non-uniform in all their aspects, including number of lightpaths carried per link, number of wavelengths per link, number of fibres per link, asymmetry of the links, and traffic flows. Routing and wavelength allocation models generally assume that the optical network is uniform and that the number of wavelengths per link is a constant. In practice however, some nodes and links carry heavy traffic and additional wavelengths are needed in those links. We study a wavelength-routed optical network based on the UK JANET topology where traffic demands between nodes are assumed to be non-uniform. We investigate how network capacity can be increased by locating congested links and suggesting cost-effective upgrades. Different traffic demands patterns, hop distances, number of wavelengths per link, and routing algorithms are considered. Numerical results show that a 95% increase in network capacity is possible by overlaying fibre on just 5% of existing links. We conclude that non-uniform traffic allocation can be beneficial to localize traffic in nodes and links deep in the network core and provisioning of additional resources there can efficiently and cost-effectively increase network capacity.

Original languageEnglish
Title of host publication15th International Conference on Transparent Optical Networks, ICTON 2013
Number of pages4
ISBN (Electronic)978-1-4799-0683-3
ISBN (Print)978-1-4799-0682-6
Publication statusPublished - 2013
Event15th International Conference on Transparent Optical Networks - Cartagena, Spain
Duration: 23 Jun 201327 Jun 2013

Publication series

NameIEEE conference publications
ISSN (Print)2161-2056


Conference15th International Conference on Transparent Optical Networks
Abbreviated titleICTON 2013


  • constraint-based routing
  • fibre overlay
  • optical networks
  • routing and wavelength allocation
  • wavelength division multiplexing
  • wavelength routing


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