An equivalent circuit model of thin film lithium niobate Mach-Zehnder modulators with T-rail travelling wave electrodes

Qingyang Wang; Yanting Guo; Lianyan Li; Yuechun Shi; Feng Wang; Xiangfei Chen

doi:10.1117/12.3045331

13 December 2024 An equivalent circuit model of thin film lithium niobate Mach-Zehnder modulators with T-rail travelling wave electrodes

Qingyang Wang, Yanting Guo, Lianyan Li, Yuechun Shi, Feng Wang, Xiangfei Chen

Author Affiliations +

Proceedings Volume 13499, AOPC 2024: Optical Devices and Integration; 1349902 (2024) https://doi.org/10.1117/12.3045331
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

T-rail electrodes has emerged as a promising candidate for increasing the electro-optical modulator(EOM) bandwidth, compared to traditional travelling wave electrodes. We demonstrate an equivalent model of thin film lithium niobate (TFLN) Mach-Zehnder modulators with T-rail electrodes, utilizing the distributed capacitance and conformal mapping techniques to calculate the microwave refractive index, RF characteristic impedance, microwave loss. The validity of the values extracted from the equivalent circuit model is confirmed by their agreement with finite element method (FEM) simulations. We analyze various influential parameters affecting modulator performance to enhance design efficiency and achieve a 3dB bandwidth of approximately 120 GHz.

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

Citation Download Citation

Qingyang Wang, Yanting Guo, Lianyan Li, Yuechun Shi, Feng Wang, and Xiangfei Chen "An equivalent circuit model of thin film lithium niobate Mach-Zehnder modulators with T-rail travelling wave electrodes", Proc. SPIE 13499, AOPC 2024: Optical Devices and Integration, 1349902 (13 December 2024); https://doi.org/10.1117/12.3045331

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