Time-Division-Multiplexing Scheme of the Folded Sagnac Sensor Array with Active Phase Bias

Zhangqi, 宋章启 Song; Mingye, 阳明晔 Yang; Xueliang, 张学亮 Zhang; Xin, 王欣 Wang; Yongming, 胡永明 Hu

doi:10.3788/aos20082803.0560

Cited by 3 publications

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Demostration of a 4-sensor folded Sangac sensor array with active phase biasing scheme

Zhang

Yang

Zhang

et al. 2008

2008 1st Asia-Pacific Optical Fiber Sensors Conference

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A 4-sensor folded Sagnac sensor array with an active phase biasing scheme is presented. The overlapping of the signal and noise pulse is avoided through a time division multiplexing scheme and the noise pulses is eliminated almost completely. The scheme can address 16 sensors when the repeat frequency of input pulse is at 68.3 KHz. The alternative phase bias technique is demonstrated, which can provide sensors with stable phase bias. The future benefit of this technique is that the llf noise in the circuit can be suppressed.

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Demostration of a 4-sensor folded Sangac sensor array with active phase biasing scheme

Zhang

Yang

Zhang

et al. 2008

2008 1st Asia-Pacific Optical Fiber Sensors Conference

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Demonstration of a Sagnac Fiber-Optc Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm

Zhao,

Li,

Wang

et al. 2023

Preprint

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Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm

Zhao,

Wang,

Yang

et al. 2025

Photonics

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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.

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Time-Division-Multiplexing Scheme of the Folded Sagnac Sensor Array with Active Phase Bias

Cited by 3 publications

References 0 publications

Demostration of a 4-sensor folded Sangac sensor array with active phase biasing scheme

Demostration of a 4-sensor folded Sangac sensor array with active phase biasing scheme

Demonstration of a Sagnac Fiber-Optc Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm

Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm

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