A cooperation control between look-ahead buffer and loop-back buffer in two-stage variable optical packet switch

  • Authors:

  • Yusuke Hirota;Shinya Yatsuo;Hideki Tode;Koso Murakami

  • Affiliations:

  • Graduate School of Information Science and Technology, Osaka University, Japan;Graduate School of Information Science and Technology, Osaka University, Japan;Graduate School of Engineering, Osaka Prefecture University, Japan;Graduate School of Information Science and Technology, Osaka University, Japan

  • Venue:
  • ONDM'10 Proceedings of the 14th conference on Optical network design and modeling
  • Year:
  • 2010

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Abstract

Programmable variable delay lines have been developed, so as to delay packets in variable durations by combining several lengths of FDLs in optical packet Switch. In practice, two-stage switch with this programmable variable delay lines has been proposed. This switch has two buffers. One is the programmable variable delay lines (Look-ahead Buffer). The other is the fixed FDLs that re-input a packet from the output to the input (Loop-back Buffer). The switch can foresee following packets and avoid contentions effectively by using two buffers. However, existing studies only focus on the Look-ahead Buffer and intelligent usage of the Loop-back Buffer is actually out of concern. In this paper, a packet transfer scheduling method in the two-stage switch is proposed. The proposed method controls both the Look-ahead Buffer and the Loop-back Buffer cooperatively and improves the utilization of the switching process. The proposed method uses the Loop-back Buffer systematically and distributes traffics in the whole switch. The effectiveness of the proposed method is evaluated through simulation experiments.