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      State aggregation-based model of asynchronous multi-fiber optical switching with shared wavelength converters

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      Author
      Akar, N.
      Raffaelli, C.
      Savi, M.
      Date
      2013
      Source Title
      Optical Switching and Networking
      Print ISSN
      1573-4277
      Publisher
      Elsevier
      Volume
      10
      Issue
      3
      Pages
      173 - 185
      Language
      English
      Type
      Article
      Item Usage Stats
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      88
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      Abstract
      This paper proposes new analytical models to study optical packet switching architectures with multi-fiber interfaces and shared wavelength converters. The multi-fiber extension of the recently proposed Shared-Per-Input-Wavelength (SPIW) scheme is compared against the multi-fiber Shared-Per-Node (SPN) scheme in terms of cost and performance for asynchronous traffic. In addition to using Markov chains and fixed-point iterations for modeling the mono-fiber case, a novel state aggregation technique is proposed to evaluate the packet loss in asynchronous multi-fiber scenario. The accuracy of the performance models is validated by comparison with simulations in a wide variety of scenarios with both balanced and imbalanced input traffic. The proposed analytical models are shown to remarkably capture the actual system behavior in all scenarios we tested. The adoption of multi-fiber interfaces is shown to achieve remarkable savings in the number of wavelength converters employed and their range. In addition, the SPIW solution allows to save, in particular conditions, a significant number of optical gates compared to the SPN solution. Indeed, SPIW allows, if properly dimensioned, potential complexity and cost reduction compared to SPN, while providing similar performance.
      Keywords
      Markov chains
      Optical packet switching
      State aggregation
      Wavelength converters
      Actual system
      Fixed-point iterations
      Input traffic
      Multi fibers
      Optical gates
      Optical packet switching
      Optical switching
      Particular condition
      Performance Model
      Shared wavelength converters
      State aggregation
      Wavelength converter
      Analytical models
      Computer simulation
      Gates (transistor)
      Markov processes
      Models
      Optical switches
      Fibers
      Permalink
      http://hdl.handle.net/11693/21041
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.osn.2012.12.001
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      • Department of Electrical and Electronics Engineering 3524
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