High modulation efficiency and large bandwidth thin-film lithium niobate modulator for visible light
Chijun Li, Bin Chen, Ziliang Ruan, Haoyuan Wu, Yujun Zhou, Jie Liu, Pengxin Chen, Kaixuan Chen, Changjian Guo, Liu Liu
Abstract
We experimentally demonstrate an integrated visible light modulator at 532 nm on the thin-film lithium niobate platform. The waveguides on such platform feature a propagation loss of 2.2 dB/mm while a grating for fiber interface has a coupling loss of 5 dB. Our fabricated modulator demonstrates a low voltage-length product of 1.1 V·cm and a large electro-optic bandwidth with a roll-off of -1.59 dB at 25 GHz for a length of 3.3 mm. This device offers a compact and large bandwidth solution to the challenge of integrated visible wavelength modulation in lithium niobate and paves the way for future small-form-factor integrated systems at visible wavelengths.