Abstract

Polarization devices on lithium niobate thin film (LNTF) are vital components for photonic integrated circuits (PICs) on the novel platform. Because both linear and nonlinear devices on the anisotropic platform are intrinsically polarization-dependent. Here, we demonstrate compact polarization beam splitters (PBS) on LNTF based on two asymmetric directional couplers with an effective length of only 180 μm. The PBS is fabricated via a single-step electron beam lithography (EBL) and inductively coupled plasma (ICP) etching process. Our device shows efficient PBS operation at the telecom bands with an extinction ratio over 26 dB and 13 dB for fundamental TE and TM modes, respectively. The device holds promise for efficient on-chip polarization division multiplexing and polarization manipulation, which would become an indispensable component in future LNTF PICs.

Polarization beam splitter based on the asymmetric directional coupler of lithium niobate film

Fang Wang, Hua Liu, Tao Ma, Shoudao Ma, and Yufang Liu
Appl. Opt. 62(1) 21-26 (2023)

Efficient polarization splitter-rotator on thin-film lithium niobate

Xuanhao Wang, An Pan, Tingan Li, Cheng Zeng, and Jinsong Xia
Opt. Express 29(23) 38044-38052 (2021)

Integrated lithium niobate polarization beam splitter based on a photonic-crystal-assisted multimode interference coupler

Mingrui Yuan, Xu Han, Huifu Xiao, Thach Giang Nguyen, Andreas Boes, Guanghui Ren, Qinfen Hao, Jiuzhi Xue, Arnan Mitchell, and Yonghui Tian
Opt. Lett. 48(1) 171-174 (2023)

Fabrication tolerant and broadband polarization splitter-rotator based on adiabatic mode evolution on thin-film lithium niobate

Ranfeng Gan, Lu Qi, Ziliang Ruan, Jie Liu, Changjian Guo, Kaixuan Chen, and Liu Liu
Opt. Lett. 47(19) 5200-5203 (2022)

Fully adiabatic polarization rotator-splitter based on thin-film lithium niobate platform

Liyuan Song, Jieru Zhao, Xiangyang Dai, Mingzhi Lu, Qiaoyin Lu, and Weihua Guo
Opt. Express 31(12) 19604-19612 (2023)