Design and performance of FDL buffers in optical switches

Zvi Rosberg, Hai Le Vu

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

A key technique for reducing packet blocking in optical switches is by temporarily buffering packets in fiber delay lines (FDLs). The packet blocking probability depend on the FDLs design as well as on how packets are scheduled to the FDL buffers. This study compares between the blocking probabilities of the following design and buffer scheduler options: (i) input vs output port FDLs; (ii) shared vs port-dependent FDLs; (iii) forward vs feedback FDLs; (iv) variable vs fixed size FDLs; and (v) FIFO vs non-overlapping buffer schedulers. The comparison results reveals several interesting facts. The first one is that feedback FDL design can reduce the number of required buffers by 75% compared with a forward FDL design. Another observed fact is that fixed-size FDLs is very wasteful, specifically, the length of a fixed size FDL has no affect on the blocking probability. The third observation is that a non-overlapping buffer scheduler can reduce the number of required FDLs by 30% compared with a FIFO scheduler.

Original languageEnglish
Title of host publicationProceedings of 2007 9th International Conference on Transparent Optical Networks, ICTON 2007
Pages213-217
Number of pages5
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes
Event2007 9th International Conference on Transparent Optical Networks, ICTON 2007 - Rome, Italy
Duration: 1 Jul 20075 Jul 2007

Publication series

NameProceedings of 2007 9th International Conference on Transparent Optical Networks, ICTON 2007
Volume3

Conference

Conference2007 9th International Conference on Transparent Optical Networks, ICTON 2007
CountryItaly
CityRome
Period1/07/075/07/07

Keywords

  • All optical networks
  • Blocking probability
  • Fiber delay line
  • Optical switches

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