Laser & Optoelectronics Progress, Volume. 62, Issue 5, 0506004(2025)

High-Capacity, High-Speed Demodulation System for Fiber Bragg Grating Sensor Arrays Using Dispersion Fourier Transform Technology

Yinuo Fang*, Qianqian Huang, Kaiquan Yan, Zishuo Xu, Mingjiao Wang, Kai Wang, Yuehui Ma, Weixi Li, Yunqi Liu, and Chengbo Mou
Author Affiliations
  • Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
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    Figures & Tables(10)
    Schematic diagram of a typical DFT-based FBG demodulation system
    Experimental setup. (a) Source laser; (b) nonlinear amplifier; (c) sensing system
    Characteristics of the incident optical pulses. (a) Time-domain waveform of the mode-locked pulses from figure-9 fiber laser; (b) RF spectrum of the mode-locked pulses from figure-9 fiber laser with a scan range of 1 MHz and a resolution bandwidth of 1 kHz, the scanning range of the illustration is 1.0 GHz, with a resolution bandwidth of 10 kHz ; (c) optical spectrum, with the blue solid line representing the source laser spectrum and the red dashed line representing the spectrum after nonlinear amplification; (d) autocorrelation waveform after nonlinear amplification
    Reflected signal from the FBG array. (a) Reflection spectrum; (b) reflected pulse sequence; (c) reflected pulse sequence before and after DFT; (d) zoomed-in view of the reflected pulse sequence before and after DFT
    Temperature-to-center wavelength calibration results for FBG 1 to FBG 5
    Demodulation results of FBG 1 during heating. (a) Reflection spectrum variation; (b) zoomed-in view of the reflection spectrum variation; (c) evolution of the reflected pulse sequence; (d) zoomed-in view of the reflected pulse sequence evolution; (e) comparison of the wavelength demodulation results with the direct wavelength measurement results; (f) temperature demodulation results
    Zoom-in views of the spectral and time-domain waveform variations caused by heating during sensor multiplexing. (a) Reflection spectrum variation of FBG 2 and FBG 3; (b) time-domain waveform variation of FBG 2 and FBG 3; (c) reflection spectrum variation of FBG 4 and FBG 5; (d) time-domain waveform variation of FBG 4 and FBG 5
    Comparison between the wavelength demodulation results and the direct wavelength measurement results during sensor multiplexing. (a) FBG 2 and FBG 3; (b) FBG 4 and FBG 5
    Temperature demodulation results during sensor multiplexing
    • Table 1. Error and correlation analysis of the temperature demodulation results

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      Table 1. Error and correlation analysis of the temperature demodulation results

      SensorMaximum error /℃Root mean square error /℃Pearson correlation coefficientP-value
      FBG 15.852.310.99891.0787×10-26
      FBG 24.992.200.99933.8217×10-27
      FBG 34.582.340.99978.7036×10-31
      FBG 43.651.870.99831.3812×10-23
      FBG 52.211.130.99937.0156×10-26
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    Yinuo Fang, Qianqian Huang, Kaiquan Yan, Zishuo Xu, Mingjiao Wang, Kai Wang, Yuehui Ma, Weixi Li, Yunqi Liu, Chengbo Mou. High-Capacity, High-Speed Demodulation System for Fiber Bragg Grating Sensor Arrays Using Dispersion Fourier Transform Technology[J]. Laser & Optoelectronics Progress, 2025, 62(5): 0506004

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Jun. 7, 2024

    Accepted: Jul. 16, 2024

    Published Online: Mar. 12, 2025

    The Author Email:

    DOI:10.3788/LOP241446

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