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薄膜铌酸锂条形多模波导中的模式杂交分析

Mode hybridization analysis in thin film lithium niobate strip multimode waveguides.

作者信息

Kaushalram Archana, Hegde Gopalkrishna, Talabattula Srinivas

机构信息

Electrical Communication Engineering, Indian Institute of Science, Bangalore, 560012, India.

Center for BioSystems Science and Engineering, Indian Institute of Science, Bangalore, 560012, India.

出版信息

Sci Rep. 2020 Oct 7;10(1):16692. doi: 10.1038/s41598-020-73936-x.

DOI:10.1038/s41598-020-73936-x
PMID:33028905
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7542427/
Abstract

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.

摘要

对空气包层的X切Y向和Z向传播的薄膜铌酸锂条形多模波导中的模式杂交现象进行了数值研究，并建立了导致混合模式的结构参数之间的数学关系。还分析了混合模式对波导尺寸、侧壁角度和波长的依赖性。所得结果用于设计绝缘体上铌酸锂（LNOI）锥形器，以将基模TM模式转换为高阶TE模式，并评估实现99.5%高转换效率的最佳长度。从长度、品质因数和制造公差方面比较了双折射Y向传播的LN和各向同性Z向传播的LN锥形器。锥形器具有200nm的宽带宽，消光比小于-18dB。模式杂交分析结果有助于绝热锥形器、可调时间延迟、光互连、模式转换器和用于模式分割复用（MDM）应用的解复用器的设计优化。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/f2542b38f19c/41598_2020_73936_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/e0e3ce74e45a/41598_2020_73936_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/e3ee72ec19db/41598_2020_73936_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/55b66ee66de2/41598_2020_73936_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/e2833cac6d06/41598_2020_73936_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/6b66a0df26ae/41598_2020_73936_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/b22ed122207a/41598_2020_73936_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/15eeada6f5bd/41598_2020_73936_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/1a7105ee9702/41598_2020_73936_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/de41659becf0/41598_2020_73936_Fig14_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/b7570cb4b946/41598_2020_73936_Fig15_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/805c/7542427/3b407bd9623a/41598_2020_73936_Fig16_HTML.jpg

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