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Electro-optic modulators lie at the heart of complex integration and highdensity electro-optic systems. One of the representative electro-opticmodulators is thin film lithium niobate based microring modulator which hasdemonstrated advantages of compact footprint, low optical loss and highmodulation efficiency. However, the linewidth and extinction ratio of ringmodulators are fundamentally limited by the ring losses and coupling,respectively. To this end, we propose a novel type of electro-optic modulatorswith ring-pair structure on thin film lithium niobate platform, which bringssubstantially improvement of linewidth and extinction ratio. The ring-pairmodulator exhibits a larger linewidth up to 22 GHz, 1.74-time larger than thatof single ring resonator with same design parameters. Moreover, theexperimental results also reveal that the added-up extinction ratio ofring-pair resonator goes beyond 30 dB, much larger than that in an individualring resonator. These advantages of ring-pair modulator pave a new way for theapplication of compact ring-based modulators with large working wavelengthwindow and high extinction ratio, to be exploited in quantum optics,programmable nanophotonics and optical sensors, etc.

Improving Linewidth and Extinction Ratio Performances of Lithium Niobate Ring Modulator Using Ring-pair Structure