8 October 2015 Improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors
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Proceedings Volume 9679, AOPC 2015: Optical Fiber Sensors and Applications; 96790X (2015) https://doi.org/10.1117/12.2199820
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China
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.
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Haiqiang Lai, Haiqiang Lai, Jianfei Wang, Jianfei Wang, Xiaobo Tu, Xiaobo Tu, Zhou Meng, Zhou Meng, } "Improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors", Proc. SPIE 9679, AOPC 2015: Optical Fiber Sensors and Applications, 96790X (8 October 2015); doi: 10.1117/12.2199820; https://doi.org/10.1117/12.2199820
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