Ke Li, Yandong Gong, Zhuo Zhang. Research Progress of φ-OTDR Noise Reduction Processing[J]. Laser & Optoelectronics Progress, 2022, 59(23): 2300002
- Laser & Optoelectronics Progress
- Vol. 59, Issue 23, 2300002 (2022)
Fig. 1. Sensing system of the φ-OTDR
![Generation mechanism of the coherent noise[11]](/richHtml/lop/2022/59/23/2300002/img_02.jpg)
Fig. 2. Generation mechanism of the coherent noise[11]
![Generation mechanism of the polarization noise[12-14]](/Images/icon/loading.gif){kind=icon}
Fig. 4. Experimental system based on coherent detection[15]
Fig. 5. Schematic diagram of the TGD-OFDMR system[18]
Fig. 6. Experimental setup for bipolar coding [20]
Fig. 7. φ-OTDR sensing system based on few-mode fiber space division multiplexing[30]
Fig. 8. φ-OTDR system based on orthogonal polarization switching[32]
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Table 1. Classification and definition of various main noises
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Table 2. Typical coherent fading suppression techniques
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Table 3. Typical polarization fading suppression techniques
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Table 4. Typical common mode noise suppression techniques
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Table 5. Comparison of various types of noise
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