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Aluminum nitride has been shown to possess both strong Kerr nonlinearity andelectro-optic Pockels effect. By combining these two effects, here wedemonstrate on-chip reversible on/off switching of the optical frequency combgenerated by an aluminum nitride microring resonator. We optimize the design ofgating electrodes and the underneath resonator structure to effectively applyelectric field without increasing the optical loss. The switching of the combis monitored by measuring one of the frequency comb peaks while varying theelectric field. The controlled comb electro-optic response is investigated fordirect comparison with the transient thermal effect.

Electrical tuning and switching of an optical frequency comb generated in aluminum nitride microring resonators