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Opt Lett. 2010 May 15;35(10):1722-4. doi: 10.1364/OL.35.001722.

Enhanced radiation-loss-based radial-waveguide-coupled electrically pumped microresonator lasers with single-directional output.

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  • 1Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA.


A novel enhanced radiation-loss (ERL)-based radial waveguide coupling mechanism for microresonator lasers is experimentally demonstrated for the first time, to the best of our knowledge, resulting in single-directional output from the lasers. A 20 microm diameter InGaAsP/InP electrically pumped microresonator laser in the form of a microcylinder resonator integrated with a transparent ERL radial output coupler is designed and fabricated. Measurement shows a low 1.5 mA lasing threshold and a relatively high output power of >0.4 mW.

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