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Mode hybridization analysis in thin film lithium niobate strip multimode waveguides

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 dime...

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Autores principales: Kaushalram, Archana, Hegde, Gopalkrishna, Talabattula, Srinivas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7542427/
https://www.ncbi.nlm.nih.gov/pubmed/33028905
http://dx.doi.org/10.1038/s41598-020-73936-x
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author Kaushalram, Archana
Hegde, Gopalkrishna
Talabattula, Srinivas
author_facet Kaushalram, Archana
Hegde, Gopalkrishna
Talabattula, Srinivas
author_sort Kaushalram, Archana
collection PubMed
description 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.
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spelling pubmed-75424272020-10-14 Mode hybridization analysis in thin film lithium niobate strip multimode waveguides Kaushalram, Archana Hegde, Gopalkrishna Talabattula, Srinivas Sci Rep Article 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. Nature Publishing Group UK 2020-10-07 /pmc/articles/PMC7542427/ /pubmed/33028905 http://dx.doi.org/10.1038/s41598-020-73936-x Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Kaushalram, Archana
Hegde, Gopalkrishna
Talabattula, Srinivas
Mode hybridization analysis in thin film lithium niobate strip multimode waveguides
title Mode hybridization analysis in thin film lithium niobate strip multimode waveguides
title_full Mode hybridization analysis in thin film lithium niobate strip multimode waveguides
title_fullStr Mode hybridization analysis in thin film lithium niobate strip multimode waveguides
title_full_unstemmed Mode hybridization analysis in thin film lithium niobate strip multimode waveguides
title_short Mode hybridization analysis in thin film lithium niobate strip multimode waveguides
title_sort mode hybridization analysis in thin film lithium niobate strip multimode waveguides
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7542427/
https://www.ncbi.nlm.nih.gov/pubmed/33028905
http://dx.doi.org/10.1038/s41598-020-73936-x
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