Jiang, Y.Han, X.Huang, H.Zhang, P.Dubey, A.Xiao, H.Yuan, M.Frigg, A.Thach, G.N.Boes, A.Li, Y.Ren, G.Su, Y.Mitchell, A.Tian, Y.2023-11-222023-11-222022Advanced Photonics Research, 2022; 3(10):2200121-1-2200121-82699-92932699-9293https://hdl.handle.net/2440/139934Published online: July 7, 2022Lithium niobate on insulator (LNOI) has been demonstrated as a promising platform for photonic integrated circuits (PICs), thanks to its excellent properties such as strong electro-optic effect, low material loss, and wide transparency window. Herein, a monolithic PIC for high-speed data communication application on a lithium-niobate-etchless platform with silicon nitride (Si₃N₄) as a loading material is proposed and demonstrated. The fabricated PIC consists of four racetrack resonator modulators and a pair of four-channel mode (de)multiplexers, which shows high data modulation rate of 70 Gbps for single channel and the total data throughput reaches up to 280 Gbps. To the best of knowledge, this is the first demonstration of PIC consisting of high-speed electro-optical modulators and (de)multiplexers with such high data capacity on Si₃N₄-LNOI hybrid platform, which opens up new avenues for achieving large-scale monolithic integration on LNOI platform in future.en© 2022 The Authors. Advanced Photonics Research published by Wiley- VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.lithium niobate on insulator (LNOI); mode-division multiplexing (MDM); racetrack ring modulator; silicon nitrideJournal article10.1002/adpr.2022001212023-11-21674020Boes, A. [0000-0001-8443-3396]