Cascaded traveling wave electrodes designed for group velocity matching in electro-optic modulation

Siyuan Wang; Mai Wang; Hongxuan Liu; Bingcheng Pan; Chenlei Li; He Gao; Zejie Yu; Liu Liu; Daoxin Dai

doi:10.1117/12.3023497

18 March 2024 Cascaded traveling wave electrodes designed for group velocity matching in electro-optic modulation

Siyuan Wang, Mai Wang, Hongxuan Liu, Bingcheng Pan, Chenlei Li, He Gao, Zejie Yu, Liu Liu, Daoxin Dai

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131043K (2024) https://doi.org/10.1117/12.3023497
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Group velocity and impedance matches are prerequisites for high-speed Mach-Zehnder electro-optic modulators. However, not all platforms can realize match conditions, restricting high-speed modulation in many practical platforms. Here we propose and demonstrate a general method to satisfy the group velocity and characteristic impedance matches by cascading fast-wave and slow-wave traveling wave electrodes on a thin-film lithium-niobate-on-insulator platform with a silica cladding. The effective group velocity can be flexibly adjusted by changing the ratio of fast-wave and slow-wave traveling wave electrodes. The radio frequency signal insertion loss at the boundary of the slow-wave and fast-wave electrodes is less than 0.1 dB. In addition, for a modulator of 6000 μm length, our simulation indicates an electro-optic response of over 100 GHz, surpassing what can be achieved with purely slow-wave or fast-wave electrodes that lack matching conditions. Our results will open many opportunities for high-speed electro-optic modulators in various platforms.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Siyuan Wang, Mai Wang, Hongxuan Liu, Bingcheng Pan, Chenlei Li, He Gao, Zejie Yu, Liu Liu, and Daoxin Dai "Cascaded traveling wave electrodes designed for group velocity matching in electro-optic modulation", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131043K (18 March 2024); https://doi.org/10.1117/12.3023497

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