Abstract

We report laterally waveguide-coupled octagonal microresonators with designed round resonator corners in silicon nitride. We demonstrate nearly single-mode add–drop filter characteristics, when $50‐\mathit{\mu }\mathrm{m}$-size round-cornered octagonal microresonators are used, with an optimum coupling efficiency exceeding 96%, a finesse of $\sim 30$, and a $Q$ of $\sim 6400$. Our experiments also reveal two unforeseen phenomena in certain microresonator shapes: a pronounced drop in coupling efficiency and resonance notches in the drop spectrum. These device characteristics hint at the recently postulated multiple orbit interference in waveguide-coupled polygonal microresonators.

© 2005 Optical Society of America

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