Muping Song, Ying Wu, Weiji Zhu, Shouwang Zhuang, Yixuan Wang. Optical Frequency Scanning Extension Detection of Coherent Optical Time Domain Reflectometry[J]. Chinese Journal of Lasers, 2019, 46(4): 0410002
- Chinese Journal of Lasers
- Vol. 46, Issue 4, 0410002 (2019)
Fig. 1. Working principle diagram of COTDR system
Fig. 2. Detection signal at different moments. (a) Time t1; (b) time t2
Fig. 3. Schematic of optical scanning frequency extension at different moments. (a) Time t1; (b) time t2
Fig. 4. Optical frequency extension simulation. (a) Distribution curves of optical power signal intensity; (b) comparison of original data and optical frequency extension data; (c) range of optical frequency extension versus temperature change
Fig. 5. Experimental system of COTDR
Fig. 6. Cross-correlation curves before and after temperature change. (a) Cross-correlation curve of original data; (b) cross-correlation curve after optical frequency extension
Fig. 7. Cross-correlation curves before and after temperature change. (a) Cross-correlation curve of original data; (b) cross-correlation curve after optical frequency extension
Fig. 8. Temperature change versus time
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