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Sensors 2017, 17(3), 634; doi:10.3390/s17030634

Detrimental Effect Elimination of Laser Frequency Instability in Brillouin Optical Time Domain Reflectometer by Using Self-Heterodyne Detection

Department of Electronics and Communication Engineering, North China Electric Power University, Baoding 071003, China
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Author to whom correspondence should be addressed.
Academic Editor: Elfed Lewis
Received: 21 December 2016 / Revised: 27 February 2017 / Accepted: 17 March 2017 / Published: 20 March 2017
(This article belongs to the Section Physical Sensors)
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Abstract

A useful method for eliminating the detrimental effect of laser frequency instability on Brillouin signals by employing the self-heterodyne detection of Rayleigh and Brillouin scattering is presented. From the analysis of Brillouin scattering spectra from fibers with different lengths measured by heterodyne detection, the maximum usable pulse width immune to laser frequency instability is obtained to be about 4 µs in a self-heterodyne detection Brillouin optical time domain reflectometer (BOTDR) system using a broad-band laser with low frequency stability. Applying the self-heterodyne detection of Rayleigh and Brillouin scattering in BOTDR system, we successfully demonstrate that the detrimental effect of laser frequency instability on Brillouin signals can be eliminated effectively. Employing the broad-band laser modulated by a 130-ns wide pulse driven electro-optic modulator, the observed maximum errors in temperatures measured by the local heterodyne and self-heterodyne detection BOTDR systems are 7.9 °C and 1.2 °C, respectively. View Full-Text
Keywords: Brillouin optical time domain reflectometer; laser frequency instability; Brillouin linewidth; self-heterodyne detection; Rayleigh scattering Brillouin optical time domain reflectometer; laser frequency instability; Brillouin linewidth; self-heterodyne detection; Rayleigh scattering
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MDPI and ACS Style

Li, Y.; Li, X.; An, Q.; Zhang, L. Detrimental Effect Elimination of Laser Frequency Instability in Brillouin Optical Time Domain Reflectometer by Using Self-Heterodyne Detection. Sensors 2017, 17, 634.

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