Transversely coupled Fabry–Perot resonators with Bragg grating reflectors

Abstract

We design and demonstrate Fabry–Perot resonators with transverse coupling using Bragg gratings as reflectors on the silicon-on-insulator (SOI) platform. The effects of tailoring the cavity length and the coupling coefficient of the directional coupler on the spectral characteristics of the device are studied. The fabricated resonators achieved an extinction ratio (ER) of 37.28 dB and a $Q$-factor of 3356 with an effective cavity length of 110 μm, and an ER of 8.69 dB and a $Q$-factor of 23642 with a 943 μm effective cavity length. The resonator structure presented here has the highest reported ER on SOI and provides additional degrees of freedom compared to an all-pass ring resonator to tune the spectral characteristics.

© 2017 Optical Society of America

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