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In situ tunable photonic filters and memories are important for emergingquantum and classical optics technologies. However, most photonic devices havefixed resonances and bandwidths determined at the time of fabrication. Here wepresent an in situ tunable optical resonator on thin-film lithium niobate. Byleveraging the linear electro-optic effect, we demonstrate widely tunablecontrol over resonator frequency and bandwidth on two different devices. Weobserve up to $\sim50\times$ tuning in the bandwidth over $\sim50$ V withlinear frequency control of $\sim230$ MHz/V. We also develop a closed-formmodel predicting the tuning behavior of the device. This paves the way forrapid phase and amplitude control over light transmitted through our device.

Arbitrary electro-optic bandwidth and frequency control in lithium niobate optical resonators