Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm
The Sagnac interferometer-based fiber-optic hydrophone (S-FOH) exhibits a frequency-dependent response, causing the output signal to deviate from the original acoustic signal, with severe cases leading to signal distortion. A response equalization demodulation algorithm is demonstrated to recover hi...
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MDPI AG
2025-01-01
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| Online Access: | https://www.mdpi.com/2304-6732/12/1/34 |
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| author | Delong Zhao Ke Wang Shuolin Yang Wenjie Xie Yuzhong Chen Jie Yang Zhangqi Song Zhaohua Sun |
| author_facet | Delong Zhao Ke Wang Shuolin Yang Wenjie Xie Yuzhong Chen Jie Yang Zhangqi Song Zhaohua Sun |
| author_sort | Delong Zhao |
| collection | DOAJ |
| description | The Sagnac interferometer-based fiber-optic hydrophone (S-FOH) exhibits a frequency-dependent response, causing the output signal to deviate from the original acoustic signal, with severe cases leading to signal distortion. A response equalization demodulation algorithm is demonstrated to recover high-fidelity acoustic signals from interference phase signals. An eight-sensor S-FOH array featuring an alternative quadrature phase bias scheme is demonstrated, and experimental verification of the response equalization demodulation algorithm is performed. The temporal relationship of phase modulation pulses and sampling light pulses is analyzed, and a demodulation algorithm is introduced to obtain the phase difference of the Sagnac interferometer. The acoustic pressure sensitivity is equalized to be flat with an average of −135.0 ± 0.4 dB from 10 to 2032 Hz. The pulse response of the S-FOHA after the equalization algorithm is highly similar to the PZT hydrophone output signal, with a correlation coefficient of 0.987. |
| format | Article |
| id | doaj-art-601303fe95b04f3da8ae0227fd77d521 |
| institution | Kabale University |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-601303fe95b04f3da8ae0227fd77d5212025-01-24T13:46:16ZengMDPI AGPhotonics2304-67322025-01-011213410.3390/photonics12010034Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation AlgorithmDelong Zhao0Ke Wang1Shuolin Yang2Wenjie Xie3Yuzhong Chen4Jie Yang5Zhangqi Song6Zhaohua Sun7School of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaSchool of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaSchool of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaSchool of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaSchool of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaSichuan Jiuzhou Electric Group Co., Ltd., Mianyang 621000, ChinaSchool of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaSchool of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, ChinaThe Sagnac interferometer-based fiber-optic hydrophone (S-FOH) exhibits a frequency-dependent response, causing the output signal to deviate from the original acoustic signal, with severe cases leading to signal distortion. A response equalization demodulation algorithm is demonstrated to recover high-fidelity acoustic signals from interference phase signals. An eight-sensor S-FOH array featuring an alternative quadrature phase bias scheme is demonstrated, and experimental verification of the response equalization demodulation algorithm is performed. The temporal relationship of phase modulation pulses and sampling light pulses is analyzed, and a demodulation algorithm is introduced to obtain the phase difference of the Sagnac interferometer. The acoustic pressure sensitivity is equalized to be flat with an average of −135.0 ± 0.4 dB from 10 to 2032 Hz. The pulse response of the S-FOHA after the equalization algorithm is highly similar to the PZT hydrophone output signal, with a correlation coefficient of 0.987.https://www.mdpi.com/2304-6732/12/1/34fiber-optic hydrophonesagnac interferometerresponse equalization |
| spellingShingle | Delong Zhao Ke Wang Shuolin Yang Wenjie Xie Yuzhong Chen Jie Yang Zhangqi Song Zhaohua Sun Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm Photonics fiber-optic hydrophone sagnac interferometer response equalization |
| title | Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm |
| title_full | Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm |
| title_fullStr | Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm |
| title_full_unstemmed | Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm |
| title_short | Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm |
| title_sort | demonstration of eight sensor sagnac fiber optic hydrophone array with alternative quadrature phase bias and response equalization demodulation algorithm |
| topic | fiber-optic hydrophone sagnac interferometer response equalization |
| url | https://www.mdpi.com/2304-6732/12/1/34 |
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