Xiuwen Zhang, Di Zheng, Xihua Zou, Wei Pan. High-Precision Microwave Photonic Filtering Interrogation Technique Based on Frequency-Time Transform[J]. Acta Optica Sinica, 2022, 42(23): 2306003
- Acta Optica Sinica
- Vol. 42, Issue 23, 2306003 (2022)
Fig. 1. Schematic diagram of MPF demodulation based on frequency-time transform
Fig. 2. Schematic diagram of time-domain refinement algorithm
Fig. 3. Experimental setup of MPF based interrogation system for fiber Bragg grating array
Fig. 4. Spectrogram and time-domain diagram of system. (a) Radio frequency response curves of fiber Bragg grating array; (b) time-domain impulse response obtained by IDFT
Fig. 5. Time-domain response curves of FBG 3 under different strain values
Fig. 6. Time-domain impulse responses obtained by two frequency-time transform algorithms under different strain values. (a) Time-domain refinement algorithm; (b) zero-padding algorithm
Fig. 7. Comparison of wavelength demodulation values obtained by two frequency-time transform algorithms and measured ones under different strain values. (a) Time-domain refinement algorithm; (b) zero-padding algorithm
Fig. 8. Comparison of wavelength interrogation values obtained by time-domain refinement algorithm and measured ones under different sampling points. (a)
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Table 1. Performance comparison of different algorithms
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Table 2. Performance comparison of time-domain refinement algorithm under different sampling points
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