Abstract
A compact silicon ring resonator is demonstrated that allows simple electrical tuning of the ring coupling coefficient and -factor and therefore the resonant enhancement of on-chip nonlinear optical processes. Fabrication-induced variation in designed coupling fraction, crucial in the resonator performance, can be overcome using this post-fabrication trimming technique. Tuning of the microring resonator across the critical coupling point is demonstrated, exhibiting a -factor tunable between 9000 and 96,000. Consequently, resonantly enhanced four-wave mixing shows tunable efficiency between and at an ultra-low on-chip pump power of 0.7 mW.
© 2015 Optical Society of America
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