Compensating thermal drift of hybrid silicon and lithium niobate ring resonances

Abstract

We present low-power compensation of thermal drift of resonance wavelengths in hybrid silicon and lithium niobate ring resonators based on the linear electro-optic effect. Fabricated devices demonstrate a resonance wavelength tunability of 12.5 pm/V and a tuning range of 1 nm. A capacitive geometry and low thermal sensitivity result in the compensation of 17°C of temperature variation using tuning powers at sub-nanowatt levels. The method establishes a route for stabilizing high-quality factor resonators in chip-scale integrated photonics subject to temperature variations.

Chemo‐mechanical polish lithography: A pathway to low loss large‐scale photonic integration on lithium niobate on insulator

“…Technically speaking, since 4‐inch LNOI wafer is already commercially available, we will consider building the abovementioned MZ interferometer array in a square‐shaped area of 60 mm × 60 mm footprint size as allowed by the 4‐inch wafer. As for a single MZ interferometer, the arm length is limited by the requirement to generate a phase shift of π in an electric field whose strength is below the coercive field threshold (∼20 kV/mm) of the LN crystal . The shortest arm length can thus be determined to be ∼1 mm.…”