Fast-light based pulse compression in 2-D photonic crystal waveguides

T Cao, MJ Cryan, Y-LD Ho, IJ Craddock, CJ Railton

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)
356 Downloads (Pure)

Abstract

Chirped-pulse propagation close to a mini-stopband (MSB) in short photonic crystal (PhC) waveguides is studied using the 2-D finite-difference time-domain method. The group delay (GD) is calculated for different length waveguides and is shown to have a nonlinear relationship with length, implying that dispersion diagram based design approaches may not be applicable in these cases. Pulse compression is then observed directly in the time domain, and a GD-based analysis is used to explain the results. It is shown that the fast-light or negative GD region that is found within the MSB plays a more important role than pulse filtering effects, which can also induce compression. The GD analysis is then used to find the optimum length waveguide for the maximum pulse compression, and this is found to be in agreement with direct time-domain results. Finally, a different PhC waveguide structure is studied based on square holes, which results in an increased GD and, hence, increased pulse compression
Translated title of the contributionFast-light based pulse compression in 2-D photonic crystal waveguides
Original languageEnglish
Pages (from-to)2590 - 2598
Number of pages9
JournalJournal of Lightwave Technology
Volume25
Issue number9
DOIs
Publication statusPublished - Sep 2007

Bibliographical note

Publisher: Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Rose publication type: Journal article

Sponsorship: The authors would like to thank Prof. J. McGeehan for the use of the Condor computing cluster, which was donated to Bristol Electrical and Electronic Engineering by Toshiba Research Laboratories Europe

Terms of use: Copyright © 2007 IEEE. Reprinted from IEEE Journal of Lightwave Technology.

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Keywords

  • photonic crystals (PhCs)
  • pulse compression
  • waveguide dispersion

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