Journal
OPTICS EXPRESS
Volume 25, Issue 4, Pages 3504-3513Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.003504
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Funding
- National Natural Science Foundation of China (NSFC) [61627816, 61540017, 61405090, 61107074]
- The Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, China [201404]
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We implement a BOTDR sensor that combines the complementary coding with the fast Fourier transform (FFT) technique for high-performance distributed sensing. The employment of the complementary coding provides an enhanced signal-to-noise ratio of the sensing system, which leads to high accuracy measurement. Meanwhile, FFT technique in BOTDR is combined to reduce the measurement time sharply compared to the classical frequency sweeping technique. In addition, a pre-depletion two-wavelength probe pulse is proposed to suppress the distortion of the coding probe pulse induced by EDFA. Experiments are carried out beyond 10 km single-mode fiber, and the results show the capabilities of the proposed scheme to achieve 2 m spatial resolution with 0.37 MHz frequency uncertainty which corresponds to similar to 0.37 degrees C temperature resolution or similar to 7.4 mu epsilon strain resolution. The measurement time can be more than tens of times faster than traditional frequency sweeping method in theory.
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