Electro-optically tunable racetrack dual microring resonator with a high quality factor based on a Lithium Niobate-on-insulator

Abstract

We propose and analyse a novel electro-optically tunable racetrack dual microring resonator with a high Q factor based on a lithium niobate-on-insulator. Using the transfer matrix method, the field transmission and attenuation of the resonator are comparatively investigated to obtain optimised coupling parameters. The enhanced Q value at the resonant wavelength of the inner ring can reach 3.873 × 106, and the blue shift of the resonant wavelength is approximately 16 nm when the applied voltages fall in a ±150 V range resulting in an electro-optic tuning rate of 0.0526 nm/V. The designed resonator presented here exhibits high performance and may offer more potential applications for lithium niobate nanophotonic devices.