Statistical study of crosstalk accumulation in WDM optical networks with different topology

  • Authors:

  • Tongyu Song;Hanyi Zhang;Yili Guo;Xiaoping Zheng

  • Affiliations:

  • Department of Electronic Engineering, Tsinghua University, Beijing, P.R. China;Department of Electronic Engineering, Tsinghua University, Beijing, P.R. China;Department of Electronic Engineering, Tsinghua University, Beijing, P.R. China;Department of Electronic Engineering, Tsinghua University, Beijing, P.R. China

  • Venue:
  • Journal of High Speed Networks
  • Year:
  • 2003

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Abstract

The robustness of optical networks with respect to the accumulation of in-band crosstalks was statistically studied in this paper, with emphases on the effect of network topology, identified by the network scale and physical connectivity. The in-band crosstalks, a major and irreparable signal quality degrading factor, are induced by non-ideal optical switches and demux/mux pairs at optical cross-connect (OXC) in optical wavelength division multiplexing (WDM) networks. For the first time, our numerical simulations revealed that in a given network scale, there exists an optimum physical connectivity: the resultant overall accumulation of in-band crosstalks can be minimized. Then the network scale was taken into account and the optimum network topology with respect to the accumulation of in-band crosstalks was discussed for practical networks, with the limit of crosstalk ratio of the state-of-the-art optical switches and demultiplexers. It was shown that proper network design can greatly relax the requirements posed on the optical switches and demultiplexers.