An optical-drop wavelength assignment algorithm for efficient wavelength reuse under heterogeneous traffic in WDM ring networks

Nobuo Funabiki, Jun Kawashima, Toru Nakanishi, Kiyohiko Okayama, Teruo Higashino

Research output: Contribution to journalArticle

3 Citations (Scopus)


The wavelength-division multiplexing (WDM) technology has been popular in communication societies for providing very large communication bands by multiple lightpaths with different wavelengths on a single optical fiber. Particularly, a double-ring optical network architecture based on the packet-over-WDM technology such as the HORNET architecture, has been extensively studied as a next generation platform for metropolitan area networks (MANs). Each node in this architecture is equipped with a wavelength-fixed optical-drop and a fast tunable transmitter so that a lightpath can be established between any pair of nodes without wavelength conversions. In this paper, we formulate the optical-drop wavelength assignment problem (ODWAP) for efficient wavelength reuse under heterogeneous traffic in this network, and prove the JVP-completeness of its decision problem. Then, we propose a simple heuristic algorithm for the basic case of ODWAP. Through extensive simulations, we demonstrate the effectiveness of our approach in reducing waiting times for packet transmissions when a small number of wavelengths are available to retain the network cost for MANs.

Original languageEnglish
Pages (from-to)1234-1240
Number of pages7
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Issue number5
Publication statusPublished - Jan 1 2005



  • Heuristic algorithm
  • NP-complete
  • Optical-drop
  • Ring network
  • WDM
  • Wavelength assignment

ASJC Scopus subject areas

  • Signal Processing
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering
  • Applied Mathematics

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