An improved algorithm for optimal lightpath establishment on a tree topology

Guoliang Xue, Weiyi Zhang, Jian Tang, Krishnaiyan Thulasiraman

Research output: Contribution to journalArticlepeer-review


Routing and wavelength assignment (RWA) aims to assign the limited number of wavelengths in a wavelengthdivision multiplexed (WDM) optical network so as to achieve greater capacity. In a recent paper [6], Datta et al. studied the problem of establishing a set of disjoint lightpaths on a tree topology using a single wavelength to maximize the total traffic supported by the chosen set of lightpaths. They discussed applications of this problem to RWA and presented a dynamic programming algorithm which optimally solves this problem in O(n 4+nD3) time, where n is the number of nodes in the network and D is the maximum node degree. In this paper, we present an improved algorithm with a time complexity of O(n2+nD2).

Original languageEnglish (US)
Article number1717477
Pages (from-to)45-56
Number of pages12
JournalIEEE Journal on Selected Areas in Communications
Issue number8 SUPPL.
StatePublished - Aug 2006
Externally publishedYes


  • Graph algorithms
  • Maximum matching
  • WDM networks
  • Wavelength assignment

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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