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Chin. Opt. Lett.
 Home  List of Issues    Issue 01 , Vol. 16 , 2018    10.3788/COL201816.010606


Demodulation method combining virtual reference interferometry and minimum mean square error for fiber-optic Fabry–Perot sensors
Xinwang Gui1;2, Michael Anthony Galle3, Li Qian1;3, Weilong Liang1;2, Ciming Zhou1;2, Yiwen Ou1;2, and Dian Fan1;2
1 National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
2 Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China
3 Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S-3 G4, Canada

Chin. Opt. Lett., 2018, 16(01): pp.010606

DOI:10.3788/COL201816.010606
Topic:Fiber optics and optical communication
Keywords(OCIS Code): 060.2370  060.2300  050.2230  

Abstract
We propose a cavity length demodulation method that combines virtual reference interferometry (VRI) and minimum mean square error (MMSE) algorithm for fiber-optic Fabry–Perot (F-P) sensors. In contrast to the conventional demodulating method that uses fast Fourier transform (FFT) for cavity length estimation, our method employs the VRI technique to obtain a raw cavity length, which is further refined by the MMSE algorithm. As an experimental demonstration, a fiber-optic F-P sensor based on a sapphire wafer is fabricated for temperature sensing. The VRI-MMSE method is employed to interrogate cavity lengths of the sensor under different temperatures ranging from 28°C to 1000°C. It eliminates the “mode jumping” problem in the FFT-MMSE method and obtains a precision of 4.8 nm, corresponding to a temperature resolution of 2.0°C over a range of 1000°C. The experimental results reveal that the proposed method provides a promising, high precision alternative for demodulating fiber-optic F-P sensors.

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Received:2017/7/29
Accepted:2017/11/23
Posted online:2017/12/6

Get Citation: Xinwang Gui, Michael Anthony Galle, Li Qian, Weilong Liang, Ciming Zhou, Yiwen Ou, and Dian Fan, "Demodulation method combining virtual reference interferometry and minimum mean square error for fiber-optic Fabry–Perot sensors," Chin. Opt. Lett. 16(01), 010606(2018)

Note: This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 61377091 and 61505152), the Pre-research Field Foundation of China (No. 6140243010116QT69001), and the Applied Basic Research Program of Wuhan, China (No. 2017010201010102).



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