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Opt Express. 2009 Dec 21;17(26):23617-28. doi: 10.1364/OE.17.023617.

Many-element coupled-resonator optical waveguides using gapless-coupled microdisk resonators.

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  • 1Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.


We report silicon photonic many-element coupled-resonator optical waveguides (CROWs) using microspiral and double-notch-shaped microdisk resonators. Such microresonators enable gapless inter-cavity coupling via seamlessly jointed sub-micrometer-sized notches. Our experiments reveal CROW transmission spectra using up to 101 gaplessly coupled microdisk resonators. We estimate from the transmission measurements an insertion loss of approximately 0.11-approximately 0.24 dB/disk within the transmission bands. We show high-order filtering performance with maximum 3-dB linewidth of approximately 2.5 nm and measurement-limited side-mode suppression ratio of approximately 30 dB. The demonstrated maximum optical delay from a 101-element 0.4-microm-notch CROW is approximately 70 ps at the transmission band center and approximately 110 ps at the sideband.

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