Ultra-large dynamic signal detection method based on combined 3x3 optical fiber interferometer

Shuidong Xiong; Chunyan Cao; Qiong Yao; Fuyin Wang; Qingkai Hou; Hu Chen; Changxiang Linghu

doi:10.1117/12.2527384

21 June 2019 Ultra-large dynamic signal detection method based on combined 3x3 optical fiber interferometer

Shuidong Xiong, Chunyan Cao, Qiong Yao, Fuyin Wang, Qingkai Hou, Hu Chen, Changxiang Linghu

Proceedings Volume 11056, Optical Measurement Systems for Industrial Inspection XI; 110562S (2019) https://doi.org/10.1117/12.2527384
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

In this paper a novel optical fiber interferometer structure for ultra-large dynamic range detection is proposed. The structure combines conventional 3×3 interferometer with optical differential 3×3 interferometer. And the sensing fiber of the conventional interferometer is used as the transmission fiber of the differential interferometer while sensing. When the external signal acts on the sensing fiber, the conventional coherent detection and differential coherent detection can be carried out simultaneously. Conventional interferometer is used to detect the normal phase change of interferometric signals. However differential interferometer can detect the difference of the phase change, that is, the undistorted phase compression signal. Then the actual signal waveform can be obtained by integrating the compressed signal, so that the detection of large signal can be realized. The simulation analysis and experimental results show that the dynamic range of 200dB can be obtained within 20Hz-10kHz band. The structure of combined interferometer uses continuous light injection and has the advantages of simple structure and low cost. It can be used to detect wide-band and ultra-large signal and has good application prospects.

Citation Download Citation

Shuidong Xiong, Chunyan Cao, Qiong Yao, Fuyin Wang, Qingkai Hou, Hu Chen, and Changxiang Linghu "Ultra-large dynamic signal detection method based on combined 3x3 optical fiber interferometer", Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 110562S (21 June 2019); https://doi.org/10.1117/12.2527384

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KEYWORDS

Interferometers

Signal detection

Optical fibers

Demodulation

Sensors

Optical sensing

Structured optical fibers

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