Fabrication and characterization of microring resonators in titanium diffused lithium niobate

Large microring resonators provide high confinement and small free spectral range. When sufficiently large, both microwave and optical photons can be confined by the structure, allowing microwave-optical coupling. Lithium niobate is an ideal candidate as it has high electro-optic and nonlinear coefficients. Electro-optic modulation of microring resonators allows dynamic and real-time tuning of the free-spectral range of the microring, making such a device useful for microwave photonics and quantum optics applications. We fabricate and characterize microring resonators in titanium diffused lithium niobate.