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30 May 2018 Rayleigh Brillouin optical time-domain analysis system using heterodyne detection and wavelength scanning
Yongqian Li, Lixin Zhang, Hanbai Fan, Hong Li
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Funded by: National Natural Science Foundation of China (NSFC), Natural Science Foundation of China, Natural Science Foundation of Hebei Province of China, Fundamental Research Funds for the Central Universities
Optical Engineering, Vol. 57, Issue 5, 056112 (May 2018). https://doi.org/10.1117/1.OE.57.5.056112
Abstract
This study proposes the use of heterodyne detection and wavelength scanning techniques to solve the problems of small signal and large noise in a Rayleigh Brillouin optical time-domain analysis (BOTDA) system and thereby improve the system performance. Based on an analysis of the Rayleigh BOTDA system, heterodyne detection is used to enhance the signal intensity and wavelength scanning is used to reduce the fading noise. Experimental results obtained using the proposed techniques show that the amplitude fluctuation and signal-to-noise ratio in a 50-m-long fiber near the fiber end with 17 wavelength scans-based averaging are, respectively, reduced by 0.91 dB and increased by 4.19 dB compared to those with a single wavelength. Furthermore, the Brillouin frequency shift in a 70-m-long fiber heated to 50°C and inserted at the center of the sensing fiber can be measured accurately with a maximum fluctuation of 0.19 MHz; this is equivalent to a temperature measurement accuracy of 0.19°C. These results indicate that the proposed techniques can realize high-accuracy measurement, and therefore, they show great potential in the field of long-distance and high-accuracy sensing.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Yongqian Li, Lixin Zhang, Hanbai Fan, and Hong Li "Rayleigh Brillouin optical time-domain analysis system using heterodyne detection and wavelength scanning," Optical Engineering 57(5), 056112 (30 May 2018). https://doi.org/10.1117/1.OE.57.5.056112
Received: 5 January 2018; Accepted: 14 May 2018; Published: 30 May 2018
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Cited by 3 scholarly publications.
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KEYWORDS
Heterodyning
Signal to noise ratio
Sensing systems
Polarization
Geometrical optics
Signal detection
Interference (communication)
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