High-performance modified uni-traveling carrier photodiode integrated on a thin-film lithium niobate platform

• DOI: 10.1364/prj.455969
• Publication Date: 2022-04-07T12:30:09Z
• Authors: Xiangwen Guo; Linbo Shao; Lingyan He; Kevin Luke; Jesse Morgan; Keye Sun; Junyi Gao; Ta-Ching Tzu; Yang Shen; Dekang Chen; Bingtian Guo; Fengxin Yu; Qianhuan Yu; Masoud Jafari; Marko Lončar; Mian Zhang; Andreas Beling
• Keywords: 0103 physical sciences; 7. Clean energy; 01 natural sciences

Lithium niobate on insulator (LNOI) has become an intriguing platform for integrated photonics for applications in communications, microwave photonics, and computing. Whereas, integrated devices including modulators, resonators, and lasers with high performance have been recently realized on the LNOI platform, high-speed photodetectors, an essential building block in photonic integrated circuits, have not been demonstrated on LNOI yet. Here, we demonstrate for the first time, heterogeneously integrated modified uni-traveling carrier photodiodes on LNOI with a record-high bandwidth of 80 GHz and a responsivity of 0.6 A/W at a 1550-nm wavelength. The photodiodes are based on an n-down InGaAs/InP epitaxial layer structure that was optimized for high carrier transit time-limited bandwidth. Photodiode integration was achieved using a scalable wafer die bonding approach that is fully compatible with the LNOI platform.