Group velocity delay in coupled-cavity waveguides based on ultrahigh-Q cavities with Bragg reflectors

Qin Chen, Duncan W E Allsopp

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Optical waveguides formed by coupled ultrahigh-Q cavities have been investigated by finite-difference time-domain (FDTD) simulation. The flexible control of group velocity and bandwidth are demonstrated by adjusting the coupling strength. An ultrahigh group velocity dispersion (GVD) of 3 x 10(6) ps mu m(-1) mu m(-1) together with a group velocity as low as 3 x 10(-5)c (c is the speed of light in vacuum) is obtained at the band edge, creating a potential application in dispersion compensation. In a coupled-cavity waveguide (CCW) consisting of cavities with quality factor (Q) of 10(6), slow light at c/100 with a useful bandwidth as wide as 230 GHz is demonstrated, in which the calculated propagation loss is only 1.3 dB cm(-1). A design for a cascaded CCW with inverse dispersion is proposed for the further improvement of bandwidth.
Original languageEnglish
Article number054010
JournalJournal of Optics A: Pure and Applied Optics
Volume11
Issue number5
DOIs
Publication statusPublished - May 2009
EventPhoton 2008 Conference - Edinburgh, SCOTLAND
Duration: 1 May 2009 → …

Keywords

  • Bragg gratings
  • coupled-cavity waveguide
  • Q factor
  • slow light
  • photonic crystal
  • group velocity delay

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