Routing and Spectrum Allocation policies for time-varying traffic in flexible optical networks

Konstantinos Christodoulopoulos, Emmanouel Varvarigos

Research output: Chapter in Book/Report/Conference proceedingConference PaperOtherpeer-review

12 Citations (Scopus)


We consider the problem of serving dynamic traffic in a spectrum flexible optical network, where the spectrum allocated to an end-to-end connection varies dynamically with time so as to follow the required source transmission rate. In the proposed framework, each connection is assigned a route and is allocated a reference frequency over that route, using an appropriate Routing and Spectrum Allocation (RSA) algorithm, but the spectrum it utilizes around the reference frequency is allowed to expand and contract to match the source rate fluctuations. To perform this function, we propose two spectrum expansion/ contraction (SEC) policies and we develop models for calculating the network blocking probability for these policies. We then present an iterative RSA algorithm that takes into account the developed blocking models and identifies the routes and the reference frequency for the connections so as to minimize the average blocking of the network.

Original languageEnglish
Title of host publication2012 16th International Conference on Optical Networking Design and Modelling, ONDM 2012
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Print)9781467314428
Publication statusPublished - 2012
Externally publishedYes
EventInternational Conference on Optical Network Design and Modeling 2012 - University of Essex, Colchester, United Kingdom
Duration: 17 Apr 201220 Apr 2012
Conference number: 16th


ConferenceInternational Conference on Optical Network Design and Modeling 2012
Abbreviated titleONDM 2012
Country/TerritoryUnited Kingdom
Internet address


  • blocking probability
  • Optical OFDM
  • routing and spectrum allocation
  • spectrum expansion/contraction policies
  • spectrum sharing
  • Spectrum-flexible networks
  • time-varying traffic

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