Tunable Q-factor silicon microring resonators for ultra-low power parametric processes

Strain, Michael J and Lacava, Cosimo and Meriggi, Laura and Cristiani, Ilaria and Sorel, Marc (2015) Tunable Q-factor silicon microring resonators for ultra-low power parametric processes. Optics Letters, 40 (7). pp. 1274-1277. ISSN 0146-9592

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    Abstract

    A compact silicon ring resonator is demonstrated that allows simple electrical tuning of the ring coupling coefficient and Q-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 Q-factor tunable between 9000 and 96,000. Consequently, resonantly enhanced four-wave mixing shows tunable efficiency between -40 and -16.3  dB at an ultra-low on-chip pump power of 0.7 mW.