Xiaolei Liu, Qing Wu, Shilong Lv, Kun Sun, Qinghao Song, Liyi Li
Abstract Lithium niobate (LN) has emerged as a highly promising platform for integrated photonic devices due to its exceptional electro-optic, nonlinear optical, and piezoelectric properties, which have garnered significant attention in the fields of optical communication and quantum photonics. This review provides a comprehensive overview of the fundamental characteristics of LN, analyzes the performance parameters of photonic devices fabricated through various preparation techniques, and summarizes the essential photonic unit structures and high-quality integrated photonic devices developed on this platform. Furthermore, the review concludes with an exploration of the challenges and future directions in enhancing the integration density and system functionality of LN devices, offering valuable insights for advancing its role in next-generation photonic integration and fostering continuous progress in this field.