Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators
In this paper, we present a novel transmission line architecture in thin-film lithium niobate (TFLN) platforms to improve the velocity match between the microwave and the optical wave. Compared to conventional coplanar waveguide (CPW), the microwave index (<inline-formula><tex-math notation...
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| Format: | Article |
| Language: | English |
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IEEE
2021-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9378945/ |
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| author | Xingrui Huang Yang Liu Zezheng Li Huan Guan Qingquan Wei Zhiguo Yu Zhiyong Li |
| author_facet | Xingrui Huang Yang Liu Zezheng Li Huan Guan Qingquan Wei Zhiguo Yu Zhiyong Li |
| author_sort | Xingrui Huang |
| collection | DOAJ |
| description | In this paper, we present a novel transmission line architecture in thin-film lithium niobate (TFLN) platforms to improve the velocity match between the microwave and the optical wave. Compared to conventional coplanar waveguide (CPW), the microwave index (<inline-formula><tex-math notation="LaTeX">$n_m$</tex-math></inline-formula>) of the proposed slotted electrodes can be optimized from 2.1 to 3 while maintaining the high modulation efficiency and 50-<inline-formula><tex-math notation="LaTeX">$\Omega$</tex-math></inline-formula> impedance match. Equivalent-circuit model analysis and finite-element simulation are performed. The simulated half-wave voltage (V<inline-formula><tex-math notation="LaTeX">$_\pi$</tex-math></inline-formula>) of 1.2 V and E-O modulation bandwidth greater than 80 GHz is obtained for a 2-cm-long modulator. By utilizing the slotted slow-wave electrode, TFLN Mach-Zehnder modulators with CMOS-compatible operating voltage and 3-dB modulation bandwidth greater than 100 GHz are potentialized. |
| format | Article |
| id | doaj-art-b0d33e19138e4a89ac2411a7e202aefe |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-b0d33e19138e4a89ac2411a7e202aefe2025-08-20T03:33:14ZengIEEEIEEE Photonics Journal1943-06552021-01-011321910.1109/JPHOT.2021.30661599378945Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate ModulatorsXingrui Huang0https://orcid.org/0000-0003-0192-7193Yang Liu1https://orcid.org/0000-0002-8041-7062Zezheng Li2https://orcid.org/0000-0003-1088-8667Huan Guan3https://orcid.org/0000-0001-7320-9559Qingquan Wei4Zhiguo Yu5Zhiyong Li6State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, ChinaIn this paper, we present a novel transmission line architecture in thin-film lithium niobate (TFLN) platforms to improve the velocity match between the microwave and the optical wave. Compared to conventional coplanar waveguide (CPW), the microwave index (<inline-formula><tex-math notation="LaTeX">$n_m$</tex-math></inline-formula>) of the proposed slotted electrodes can be optimized from 2.1 to 3 while maintaining the high modulation efficiency and 50-<inline-formula><tex-math notation="LaTeX">$\Omega$</tex-math></inline-formula> impedance match. Equivalent-circuit model analysis and finite-element simulation are performed. The simulated half-wave voltage (V<inline-formula><tex-math notation="LaTeX">$_\pi$</tex-math></inline-formula>) of 1.2 V and E-O modulation bandwidth greater than 80 GHz is obtained for a 2-cm-long modulator. By utilizing the slotted slow-wave electrode, TFLN Mach-Zehnder modulators with CMOS-compatible operating voltage and 3-dB modulation bandwidth greater than 100 GHz are potentialized.https://ieeexplore.ieee.org/document/9378945/Electro-optical systemsoptical interconnectswaveguide devices |
| spellingShingle | Xingrui Huang Yang Liu Zezheng Li Huan Guan Qingquan Wei Zhiguo Yu Zhiyong Li Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators IEEE Photonics Journal Electro-optical systems optical interconnects waveguide devices |
| title | Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators |
| title_full | Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators |
| title_fullStr | Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators |
| title_full_unstemmed | Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators |
| title_short | Advanced Electrode Design for Low-Voltage High-Speed Thin-Film Lithium Niobate Modulators |
| title_sort | advanced electrode design for low voltage high speed thin film lithium niobate modulators |
| topic | Electro-optical systems optical interconnects waveguide devices |
| url | https://ieeexplore.ieee.org/document/9378945/ |
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