Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber
A Hz level narrow linewidth all-optical microwave oscillator based on the torsional radial acoustic modes (TR<sub>2,m</sub>) of a single-mode fiber (SMF) is proposed and validated. The all-optical microwave oscillator consists of a 20 km SMF main ring cavity and a 5 km SMF sub ring cavit...
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MDPI AG
2025-01-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/16/1/97 |
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| author | Wen Wang Wenjun He Xinyue Fang Yi Liu Yajun You Mingxing Li Lei Yu Qing Yan Yafei Hou Jian He Xiujian Chou |
| author_facet | Wen Wang Wenjun He Xinyue Fang Yi Liu Yajun You Mingxing Li Lei Yu Qing Yan Yafei Hou Jian He Xiujian Chou |
| author_sort | Wen Wang |
| collection | DOAJ |
| description | A Hz level narrow linewidth all-optical microwave oscillator based on the torsional radial acoustic modes (TR<sub>2,m</sub>) of a single-mode fiber (SMF) is proposed and validated. The all-optical microwave oscillator consists of a 20 km SMF main ring cavity and a 5 km SMF sub ring cavity. The main ring cavity provides forward stimulated Brillouin scattering gain and utilizes a nonlinear polarization rotation effect to achieve TR<sub>2,7</sub> mode locking. By combining the sub ring cavity with the main ring cavity and utilizing the Vernier effect, the TR<sub>2,7</sub> mode microwave photonic single longitudinal mode (SLM) output can be ensured. Meanwhile, the 6.281 Hz narrow linewidth of the TR<sub>2,7</sub> mode is achieved by reducing the intrinsic linewidth of the passive resonant cavity. The acoustic mode suppression ratio and side mode suppression ratio of the TR<sub>2,7</sub> mode were 43 dB and 54 dB, respectively. The power and frequency fluctuations of within 40 min were approximately ±0.49 dB and ±0.187 kHz, indicating good stability. At a frequency offset of 10 kHz, the TR<sub>2,7</sub> mode had a low phase noise value of −110 dBc/Hz. This solution can be used in various fields, such as high-precision radar detection, long-distance optical communication, and high-performance fiber optic sensing. |
| format | Article |
| id | doaj-art-c6e8aa5ef56b4ceeb5fbb35dcd5efd62 |
| institution | Kabale University |
| issn | 2072-666X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Micromachines |
| spelling | doaj-art-c6e8aa5ef56b4ceeb5fbb35dcd5efd622025-01-24T13:42:09ZengMDPI AGMicromachines2072-666X2025-01-011619710.3390/mi16010097Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode FiberWen Wang0Wenjun He1Xinyue Fang2Yi Liu3Yajun You4Mingxing Li5Lei Yu6Qing Yan7Yafei Hou8Jian He9Xiujian Chou10Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaShanxi Key Laboratory of Ferroelectric Physical Micronano Devices and Systems, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaKey Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, ChinaA Hz level narrow linewidth all-optical microwave oscillator based on the torsional radial acoustic modes (TR<sub>2,m</sub>) of a single-mode fiber (SMF) is proposed and validated. The all-optical microwave oscillator consists of a 20 km SMF main ring cavity and a 5 km SMF sub ring cavity. The main ring cavity provides forward stimulated Brillouin scattering gain and utilizes a nonlinear polarization rotation effect to achieve TR<sub>2,7</sub> mode locking. By combining the sub ring cavity with the main ring cavity and utilizing the Vernier effect, the TR<sub>2,7</sub> mode microwave photonic single longitudinal mode (SLM) output can be ensured. Meanwhile, the 6.281 Hz narrow linewidth of the TR<sub>2,7</sub> mode is achieved by reducing the intrinsic linewidth of the passive resonant cavity. The acoustic mode suppression ratio and side mode suppression ratio of the TR<sub>2,7</sub> mode were 43 dB and 54 dB, respectively. The power and frequency fluctuations of within 40 min were approximately ±0.49 dB and ±0.187 kHz, indicating good stability. At a frequency offset of 10 kHz, the TR<sub>2,7</sub> mode had a low phase noise value of −110 dBc/Hz. This solution can be used in various fields, such as high-precision radar detection, long-distance optical communication, and high-performance fiber optic sensing.https://www.mdpi.com/2072-666X/16/1/97torsional radial acoustic modesingle longitudinal modeall-optical microwave oscillatornarrow linewidthforward stimulated Brillouin scattering |
| spellingShingle | Wen Wang Wenjun He Xinyue Fang Yi Liu Yajun You Mingxing Li Lei Yu Qing Yan Yafei Hou Jian He Xiujian Chou Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber Micromachines torsional radial acoustic mode single longitudinal mode all-optical microwave oscillator narrow linewidth forward stimulated Brillouin scattering |
| title | Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber |
| title_full | Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber |
| title_fullStr | Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber |
| title_full_unstemmed | Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber |
| title_short | Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber |
| title_sort | narrow linewidth all optical microwave oscillator based on torsional radial acoustic modes of single mode fiber |
| topic | torsional radial acoustic mode single longitudinal mode all-optical microwave oscillator narrow linewidth forward stimulated Brillouin scattering |
| url | https://www.mdpi.com/2072-666X/16/1/97 |
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