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High-performance optical chirp chain BOTDA by using a pattern recognition algorithm and the differential pulse-width pair technique

查看全文 作　　者：BENZHANG [1]WANG;BAOHUA [2]FAN;DENGWANG [1]ZHOU;CHAO [1]PANG;YUE [1]LI;DEXIN [1]BA;YONGKANG [1]DONG 高影响力作者 机构地区：[1]National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China;[2]The 29th Research Institute of China Electronics Technology Group Corporation, Chengdu 610036, China高影响力机构 出　　处：《Photonics Research》索引2019年第7卷第6期,共7页高影响力期刊 基　　金：National Natural Science Foundation of China(NSFC)(61575052);National Key Scientific Instrument and Equipment Development Project of China(2017YFF0108700) 摘　　要：Optical chirp chain Brillouin optical time-domain analysis(OCC-BOTDA) has the capabilities of fast measurement, high Brillouin threshold, and freedom from the nonlocal effect;at the same time, however, it also has problems introduced by transient stimulated Brillouin scattering. The influence of the transient interaction is reflected as the broadened asymmetric Brillouin spectrum, the ghost peak, and the frequency shift of the main peak. This introduces difficulty in computing the fiber Brillouin frequency shift with good measurement accuracy. Besides, the OCC modulation causes additional noise due to the uneven amplitude response for different frequency components. In this work, we propose a high-performance OCC-BOTDA using the principal component analysis(PCA) based pattern recognition algorithm and differential pulse-width pair(DPP) technique.After building the Brillouin spectrum database(i.e., all patterns), the fiber intrinsic Brillouin frequency shift can be recognized by the PCA algorithm from a nonstandard Brillouin spectrum profile, resulting in good measurement accuracy. Meanwhile, the DPP technique, subtracting between two Brillouin signals generated by two wide-width pump pulses, is utilized to reduce the OCC modulation noise and avoid the pulse self-phase modulation effect in long-range BOTDA sensing. In the experiment, a temperature measurement with 1.3 MHz measurement precision, 4 m spatial resolution, and 5 s measurement time is achieved over a 100 km single-mode fiber. 关 键 词：pattern recognition ALGORITHM BOTDA
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