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Mode hybridization analysis in thin film lithium niobate strip multimode waveguides

Kaushalram, A and Hegde, G and Talabattula, S (2020) Mode hybridization analysis in thin film lithium niobate strip multimode waveguides. In: Scientific Reports, 10 (1).

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Official URL: https://doi.org/10.1038/s41598-020-73936-x


Mode hybridization phenomenon in air-cladded X-cut Y-propagating and Z-propagating thin film lithium niobate strip multimode waveguides is numerically studied and a mathematical relation between structural parameters leading to hybrid modes is formulated. Dependence of hybrid modes on waveguide dimensions, sidewall angles and wavelength is also analyzed. The results obtained are used to design lithium niobate on insulator (LNOI) taper for converting fundamental TM mode to higher order TE mode, and an optimum length for achieving a high conversion efficiency of 99.5% is evaluated. Birefringent Y-propagating LN and isotropic Z-propagating LN tapers are compared in terms of length, figures of merit, and fabrication tolerance. Tapers exhibit a broad bandwidth of 200 nm with an extinction ratio less than − 18 dB. The results of mode hybridization analysis are useful in design optimization of adiabatic tapers, tunable time delays, optical interconnects, mode converters and demultiplexers for mode division multiplexing (MDM) applications. © 2020, The Author(s).

Item Type: Journal Article
Publication: Scientific Reports
Publisher: Nature Research
Additional Information: The copyright for this article belongs to The Author(s).
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 10 Jan 2023 05:50
Last Modified: 10 Jan 2023 05:50
URI: https://eprints.iisc.ac.in/id/eprint/78982

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