Review of advanced progress of χ2-based all-optical devices on thin-film lithium niobate

Abstract

The technological innovation of thin-film lithium niobate (TFLN) is supplanting the traditional lithium niobate industry and generating a vast array of ultra-compact and low-loss optical waveguide devices, providing an unprecedented prospect for chip-scale integrated optics. Because of its unique strong quadratic nonlinearity, TFLN is widely used to create new coherent light, which significantly promotes all-optical signal processes, especially in terms of speed. Herein, we review recent advances in TFLN, review the thorough optimization strategies of all-optical devices with unique characteristics based on TFLN, and discuss the challenges and perspectives of the developed nonlinear devices.

Design of ultra-compact thin-film lithium niobate edge coupler based on micro–nano structure

“…Thin-film lithium niobate (TFLN) platform emerged recently is an excellent candidate for multi-functional photonic integration [1][2][3] owing to the excellent material properties of lithium niobate (LN) [4,5] and the ability to achieve highindex-contrast nanophotonic waveguides with exceptionally low propagation loss [6,7]. All kinds of integrated functional devices on the TFLN platform with comparable or even superior performance to bulk devices have been proposed and experimentally characterized such as tunable lasers [8], electro-optic modulators [9,10], wavelength convertors [11] and frequency comb generators [12].…”