THE DEMODULATION ALGORITHM OF OPTICAL FIBER FABRY–PEROT SENSOR USING THE NONLINEAR DYNAMIC CHARACTERISTICS OF THE OPTICAL FIBER BROADBAND LIGHT SOURCE

Fei Feng, Baojie Chen, Hashim M. Alshehri (), Yingbin Liu and Li Qin
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Fei Feng: Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
Baojie Chen: ��Key Laboratory of Instrumentation Science and Dynamic Measurement, North University of China, Taiyuan 030051, P. R. China‡Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, P. R. China
Hashim M. Alshehri: �Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21521, Saudi Arabia
Yingbin Liu: �School of Environment and Safety Engineering, North University of China, Taiyuan 030051, P. R. China
Li Qin: ��Key Laboratory of Instrumentation Science and Dynamic Measurement, North University of China, Taiyuan 030051, P. R. China‡Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, P. R. China

FRACTALS (fractals), 2022, vol. 30, issue 02, 1-12

Abstract: The purpose is to optimize the optical fiber Fabry–Perot (F-P) sensor’s performances to provide a realistic basis for the optical fiber’s development. First, the classification of the optical fiber F-P sensors is summarized. The optical fiber F-P sensors’ fundamental principles are analyzed, focusing on the phase demodulation method that converts the optical fiber F-P sensing system’s input light source into a broadband light source. The broadband light source’s lightwave changes are analyzed, and the Fourier transform method and the fringe counting method are proposed to optimize the phase demodulation method’s function and analyze the light source’s nonlinear dynamic characteristics. According to the proposed demodulation method, the optical fiber F-P sensor with a cavity length change of [180, 190]μm is simulated, and the cavity length selected for the simulation spectrum is the change range’s center value, 185um. The wavelength division multiplexer (WDM) decomposes the two optical signals, and an equation directly calculates the wavelength value orthogonal to its phase. The results show that the light intensity’s initial value of the actual spectrum is 0.04, and that of the standard function is 0.06. The light intensities for the maximum peak values are the same, 0.12, with the wavelength in 1.455 × 10−6–1.47 × 10−6m. When the wavelength exceeds 1.47 × 10−6m before the next peak, the light intensity difference between them is large. The two orthogonal optical signals’ peaks change between the cavity length 0.18nm and 0.19nm after the wavelength selected, and the two signals’ peak values are orthogonal with the cavity length changes. The two signals’ initial and end peak values are different. The curve obtained by the two signals division calculation shows a tangent trend with the highest peak value of 87 and the lowest of − 58. The peak curve changes obtained by the two signals’ arctangent calculation are in an orthogonal state, with the maximum peak value of 1.3 and the minimum of − 1.3. The reflected light peak value changes of the optical fiber F-P sensor are in an orthogonal state, with the highest value of − 12 and the lowest − 31, and the adjacent peak changes in the wavelengths of 1500–1580 are the same. The curve’s fitting linearity is 1, and the linearity in the dynamic demodulation is 0.9776. The sampling frequency in the phase demodulation is 1 × 103Hz, and the sampling frequency in the dynamic demodulation is 1 × 105Hz, showing that upgrading the interface can increase the dynamic sampling frequency continuously to improve the device performance.

Keywords: Optical Fiber Broadband; Light Source’s Nonlinear Dynamic Characteristics; Optical Fiber F-P Sensor; The Demodulation Algorithm (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218348X22400722

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