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


Chen, Q. and Allsopp, D. W. E., 2009. Group velocity delay in coupled-cavity waveguides based on ultrahigh-Q cavities with Bragg reflectors. Journal of Optics A: Pure and Applied Optics, 11 (5), 054010.

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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.


Item Type Articles
CreatorsChen, Q.and Allsopp, D. W. E.
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Uncontrolled Keywordsbragg gratings,coupled-cavity waveguide,q factor,slow light,photonic crystal,group velocity delay
DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
Research CentresCentre for Advanced Sensor Technologies (CAST)
ID Code13976
Additional InformationProceedings paper from the Photon 2008 Conference, Heriot Watt University, Edinburgh, Scotland, 26-29 August, 2008


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