Shengtao Lin, Zinan Wang, Ji Xiong, Yue Wu, Yunjiang Rao. Progresses of Anti-Interference-Fading Technologies for Rayleigh-Scattering-Based Optical Fiber Sensing[J]. Laser & Optoelectronics Progress, 2021, 58(13): 1306008
- Laser & Optoelectronics Progress
- Vol. 58, Issue 13, 1306008 (2021)
Fig. 1. Multipath effects
Fig. 2. Phase demodulation scheme in Φ-OTDR. (a) Interferometer structure; (b) double pulse structure; (c) digital domain coherent demodulation; (d) coherent demodulation based on optical hybrid
![Phase shift double pulse method for eliminating interference fading[64]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Phase shift double pulse method for eliminating interference fading[64]
Fig. 4. Pulse phase shift for eliminating interference fading[66]
Fig. 5. Temporally sequenced multi-frequency [71]
Fig. 6. Optical frequency comb for eliminating interference fading[43]
Fig. 7. Rotated-vector-sum method for eliminating interference fading[51]
Fig. 8. Positive and negative frequency band for eliminating interference fading[82]
Fig. 9. Continuous chirped-wave phase-sensitive OTDR with interference fading elimination[83]
Fig. 10. Multi-carrier non-linear frequency modulation for eliminating interference fading[84]
Fig. 11. In the case of multi-degree-of-freedom superimposition, relationship between superimposition number M and reconstructed demodulation signal gain and fluctuation[52]. (a) Reconstructed demodulation signal gain; (b) fluctuation
Fig. 12. Linearized pulse-coding phase-sensitive OTDR[44]
Fig. 13. Spectrum extraction and remix method for eliminating interference fading[93]
Fig. 14. Non-matched filter method for fading immunity Φ-OTDR[100]
Fig. 15. SPEA in frequency domain for fading immunity Φ-OTDR[101]
Fig. 16. Dechirp operation and SPEA in time domain for fading immunity Φ-OTDR[102]
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Table 1. Development of phase demodulation Φ-OTDR based on chirped pulse
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