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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and O. Gerstel
  • Vol. 4, Iss. 6 — Jun. 1, 2012
  • pp: 490–502

PTES: A New Packet Transmission Technique in Bufferless Slotted OPS Networks

Akbar Ghaffarpour Rahbar  »View Author Affiliations

Journal of Optical Communications and Networking, Vol. 4, Issue 6, pp. 490-502 (2012)

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Optical packet contention is the major problem in optical packet switching (OPS) networks. In this paper, a software-based contention reduction scheme is proposed for all-optical multi-fiber slotted OPS networks, called packet transmission based on the scheduling of empty time-slots (PTES), suitable for overlaid star topology used in a metropolitan area with heterogeneous distances. In the scheduling procedure (performed in a distributed manner by each edge node of a star network) within a frame interval, some time-slots are scheduled as empty time-slots and the remaining time-slots are scheduled as non-empty. Then, an edge node must avoid sending its traffic in empty time-slots. Instead, non-empty time-slots can be used for traffic transmission. With respect to this scheduling, the variance of the number of non-empty time-slots that carry traffic from all edge nodes is minimized in the core node at each time-slot, thus reducing the traffic loss. Mathematical formulas are also provided to compute the traffic loss and delay under PTES. Performance evaluation results illustrate that PTES can reduce the number of collision events and traffic loss, especially at light and moderate traffic loads.

© 2012 OSA

OCIS Codes
(060.4259) Fiber optics and optical communications : Networks, packet-switched
(060.4263) Fiber optics and optical communications : Networks, star

ToC Category:
Research Papers

Original Manuscript: July 19, 2011
Revised Manuscript: April 4, 2012
Manuscript Accepted: April 23, 2012
Published: May 21, 2012

Akbar Ghaffarpour Rahbar, "PTES: A New Packet Transmission Technique in Bufferless Slotted OPS Networks," J. Opt. Commun. Netw. 4, 490-502 (2012)

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