Jun Ruan, Hao Sun, Zhijun Zhu, Lin Tian, Wanli Xu, Baofeng Wu, Xiaohan Sun. Location of Weak Faults in Optical Fiber Links of Direct Current Control and Protection System[J]. Chinese Journal of Lasers, 2021, 48(20): 2006002
- Chinese Journal of Lasers
- Vol. 48, Issue 20, 2006002 (2021)
Fig. 1. Block diagram of the Φ-OTDR experimental system
Fig. 2. Experimental test platform of the Φ-OTDR system. (a) Experimental device; (b) device for simulating the condition of optical fiber link
Fig. 3. Test results of the system in simulated fault environment
Fig. 4. Information entropy at different locations of the fault signal
Fig. 5. Processing results of segmented information entropy. (a) Information entropy of each position in different segments; (b) SNR of the system in different segments
Fig. 6. Signal information entropy at each position in different segments
Fig. 7. Processing result of multiplying the information entropy of the integral section. (a) Information entropy of the signal at each position in different segments; (b) information entropy of the signal at each position when k=2
Fig. 8. System SNR under different processing algorithms
Fig. 9. Positioning accuracy of different period
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