Enhanced group velocity of ultrashort optical pulses in Bragg grating waveguide structure

Jacques W.D. Chi, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


Theoretical investigation using both time-domain and frequency-domain methods shows that effective group velocity in optical waveguides can be significantly enhanced by a Bragg grating, so that picosecond optical pulses whose spectrum is located around Bragg bandgap center, can travel 2.6 times as fast compared with the case without grating. Moreover, we point out that this enhanced group velocity can be controlled by the carrier-induced optical gain. This last effect is induced through linewidth enhancement factor, which detunes pulse wavenumber from the center of Bragg bandgap, where pulse transmission is the fastest. This may imply interesting applications, such as an electronically controlled optical delay in optical transmission systems.
Original languageEnglish
Pages (from-to)41-43
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number1
Publication statusPublished - 1 Jan 2002
Externally publishedYes


  • Electromagnetic propagation in a dispersive medium
  • Optical gratings
  • Optical pulses
  • Superluminal propagation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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