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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 21,
  • Issue 4,
  • pp. 893-
  • (2003)

Cell-Sorting Device for Creating Synchronous Variable-Length Optical Packet Switches

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Abstract

We consider the design of a synchronous variable-length optical packet switch. Fixed-length packet switches may be used to switch variable-length packets if the packets are first divided into multiple fixed-length cells. However, for many fixed-length switch architectures, cells from multiple packets will become interspersed, and packet integrity will not be preserved. We describe the design of a fiber-delay-line-based cell sorter that when appended to the output of a fixed-length packet switch converts the switch into a variable-length packet switch by enabling variable-length packets to exit contiguously. We describe two implementations of the cell sorter. The first is simply a bank of delay lines. The second uses two stages of time-slot interchange and reduces the number of delay line elements to be a logarithmic function of the maximum packet length. We also estimate the packet-blocking probabilities of the resulting variable-length packet switch and verify our results via simulation.

© 2003 IEEE

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