Zhaopeng Si, Zehua Bu, Bangning Mao, Chunliu Zhao, Ben Xu, Juan Kang, Yi Li, Shangzhong Jin. Review of Research on Phase Sensitive Optical Time-Domain Reflectometer Based on Phase Demodulation[J]. Laser & Optoelectronics Progress, 2022, 59(11): 1100007
- Laser & Optoelectronics Progress
- Vol. 59, Issue 11, 1100007 (2022)
![Working principle of Φ-OTDR[1]](/richHtml/lop/2022/59/11/1100007/img_01.jpg)
Fig. 1. Working principle of Φ-OTDR[1]
![Exponential attenuation factor values at different positions under different line widths [5]](/richHtml/lop/2022/59/11/1100007/img_02.jpg)
Fig. 2. Exponential attenuation factor values at different positions under different line widths [5]
![Comparison of relationship between signal-to-noise ratio and line width of experimental detection and theoretical derivation [5]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Comparison of relationship between signal-to-noise ratio and line width of experimental detection and theoretical derivation [5]
Fig. 4. Schematic diagram of UWB fiber grating enhanced SNR[18]. (a) A single OTDR trajectory; (b) 299th and 300th UWB fiber grating signals
Fig. 5. Variation diagram of Φ-OTDR pulse train[41]. (a) Traditional Φ-OTDR pulse train; (b) Φ-OTDR pulse train under frequency divsion multiplexing; (c) frequency variation of pulse train
Fig. 6. Φ-OTDR system installation diagram[9]. (a) Based on direct detection structure; (b) based on heterodyne coherence detection structure; (c) based on 3-port coupler detection structure; (d) based on phase generation carrier (PGC) detection structure
Fig. 7. Based on DAS intrusion detection device[60]
Fig. 8. Deformation simulation results of fiber composite phase line dancing[68]
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