Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory
Mode (de)multiplexers (MDMs) serve as critical foundational elements within systems for facilitating high-capacity communication, relying on mode conversions achieved through directional coupler (DC) structures. However, DC structures are challenged by dispersion issues for broadband mode coupling,...
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MDPI AG
2024-08-01
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| author | Kun Yin Wenting Jiao Lin Wang Shiqiang Zhu |
| author_facet | Kun Yin Wenting Jiao Lin Wang Shiqiang Zhu |
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| description | Mode (de)multiplexers (MDMs) serve as critical foundational elements within systems for facilitating high-capacity communication, relying on mode conversions achieved through directional coupler (DC) structures. However, DC structures are challenged by dispersion issues for broadband mode coupling, particularly for high-order modes. In this work, based on the principles of phase control theory, we have devised an approach to mitigate the dispersion challenges, focusing on a thin-film lithium niobate-on-onsulator (LNOI) platform. This solution involves integrating a customized inverse-dispersion section into the device architecture, offsetting minor phase shifts encountered during the mode coupling process. By employing this approach, we have achieved broadband mode conversion from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>1</mn></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>2</mn></msub></mrow></semantics></math></inline-formula> within a 300 nm wavelength range, and the maximum deviations were maintained below −0.68 dB and −0.78 dB, respectively. Furthermore, the device exhibited remarkably low crosstalk, reaching down to −26 dB. |
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| institution | OA Journals |
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| language | English |
| publishDate | 2024-08-01 |
| publisher | MDPI AG |
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| series | Micromachines |
| spelling | doaj-art-c02585e06eac4c6c80dc3e7f90f660a02025-08-20T01:55:41ZengMDPI AGMicromachines2072-666X2024-08-01159108410.3390/mi15091084Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control TheoryKun Yin0Wenting Jiao1Lin Wang2Shiqiang Zhu3School of Mechanical Engineering, Zhejiang University, Hangzhou 310007, ChinaZhejiang Lab, Hangzhou 311112, ChinaZhejiang Lab, Hangzhou 311112, ChinaSchool of Mechanical Engineering, Zhejiang University, Hangzhou 310007, ChinaMode (de)multiplexers (MDMs) serve as critical foundational elements within systems for facilitating high-capacity communication, relying on mode conversions achieved through directional coupler (DC) structures. However, DC structures are challenged by dispersion issues for broadband mode coupling, particularly for high-order modes. In this work, based on the principles of phase control theory, we have devised an approach to mitigate the dispersion challenges, focusing on a thin-film lithium niobate-on-onsulator (LNOI) platform. This solution involves integrating a customized inverse-dispersion section into the device architecture, offsetting minor phase shifts encountered during the mode coupling process. By employing this approach, we have achieved broadband mode conversion from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>1</mn></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><msub><mi>E</mi><mn>2</mn></msub></mrow></semantics></math></inline-formula> within a 300 nm wavelength range, and the maximum deviations were maintained below −0.68 dB and −0.78 dB, respectively. Furthermore, the device exhibited remarkably low crosstalk, reaching down to −26 dB.https://www.mdpi.com/2072-666X/15/9/1084thin-film lithium niobatemode (de)multiplexeroptical phase control |
| spellingShingle | Kun Yin Wenting Jiao Lin Wang Shiqiang Zhu Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory Micromachines thin-film lithium niobate mode (de)multiplexer optical phase control |
| title | Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory |
| title_full | Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory |
| title_fullStr | Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory |
| title_full_unstemmed | Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory |
| title_short | Ultra-Broadband Mode (De)Multiplexer on Thin-Film Lithium Niobate Platform Adopting Phase Control Theory |
| title_sort | ultra broadband mode de multiplexer on thin film lithium niobate platform adopting phase control theory |
| topic | thin-film lithium niobate mode (de)multiplexer optical phase control |
| url | https://www.mdpi.com/2072-666X/15/9/1084 |
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