Abstract

We present Vernier-effect photonic microcavities based on a germanium-on-silicon technology platform, operating around the mid-infrared wavelength of 3.8 μm. Cascaded racetrack resonators have been designed to operate in the second regime of the Vernier effect, and typical Vernier comb-like spectra have been successfully demonstrated with insertion losses of $\sim 5\mathrm{dB}$, maximum extinction ratios of $\sim 23\mathrm{dB}$, and loaded quality factors higher than 5000. Furthermore, an add–drop racetrack resonator designed for a Vernier device has been characterized, exhibiting average insertion losses of 1 dB, extinction ratios of up to 18 dB, and a quality factor of $\sim 1700$.

© 2016 Optical Society of America

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