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Proceedings Paper

Improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors
Author(s): Haiqiang Lai; Jianfei Wang; Xiaobo Tu; Zhou Meng
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Paper Abstract

An improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors is demonstrated. This scheme uses two series-connected Acoustic-optic modulators (AOMs) as intensity modulator and frequency shifter respectively. Compared to the traditional optical heterodyne demodulation structure, this scheme eliminates the polarization-induced signal fading and the noise floor is lowered for using the Michelson-configuration delay structure and Faraday rotation mirrors (FRMs) in the optic architecture of system. At the same time, the architecture of this scheme is not complicated and can be used to complex a large sensor array. Experimental results show that the phase noise floor of this demodulation scheme is flat and reaches -99dB/sqrt(Hz) at frequencies above 300 Hz.

Paper Details

Date Published: 8 October 2015
PDF: 5 pages
Proc. SPIE 9679, AOPC 2015: Optical Fiber Sensors and Applications, 96790X (8 October 2015); doi: 10.1117/12.2199820
Show Author Affiliations
Haiqiang Lai, National Univ. of Defense Technology (China)
Jianfei Wang, National Univ. of Defense Technology (China)
Xiaobo Tu, National Univ. of Defense Technology (China)
Zhou Meng, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 9679:
AOPC 2015: Optical Fiber Sensors and Applications
Yanbiao Liao; Weixu Zhang; Desheng Jiang; Wei Wang; Gilberto Brambilla, Editor(s)

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