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 language | English |
|---|---|
| Article number | 054010 |
| Journal | Journal of Optics A: Pure and Applied Optics |
| Volume | 11 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 2009 |
| Event | Photon 2008 Conference - Edinburgh, SCOTLAND Duration: 1 May 2009 → … |
Bibliographical note
Proceedings paper from the Photon 2008 Conference, Heriot Watt University, Edinburgh, Scotland, 26-29 August, 2008Keywords
- Bragg gratings
- coupled-cavity waveguide
- Q factor
- slow light
- photonic crystal
- group velocity delay