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Regular | Open Access

High-Speed Mach-Zehnder-OTDR Distributed Optical Fiber Vibration Sensor Using Medium-Coherence Laser

Yuheng TONG, Zhengying LI( ), Jiaqi WANG, Honghai WANG, Haihu YU
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
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Abstract

This article presents a high-speed distributed vibration sensing based on Mach-Zehnder-OTDR (optical time-domain reflectometry). Ultra-weak fiber Bragg gratings (UWFBG), whose backward light intensity is 2-4 orders of magnitude higher than that of Rayleigh scattering, are used as the reflection markers. A medium-coherence laser can substitute conventional narrow bandwidth source to achieve an excellent performance of distributed vibration sensing since our unbalanced interferometer matches the interval of UWFBGs. The 3m of spatial resolution of coherent detection and multiple simultaneous vibration sources locating can be realized based on OTDR. The enhanced signal to noise ratio (SNR) enables fast detection of distributed vibration without averaging. The fastest vibration of 25kHz and the slowest vibration of 10Hz can be detected with our system successfully, and the linearity is 0.9896 with a maximum deviation of 3.46nƐ.

Keywords

High-speedMach-Zehnder-OTDRultra-weak fiber Bragg grating arraymedium-coherence laseroptical fiber vibration sensing

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Photonic Sensors
Volume 8 Issue 3,
September 2018
Pages 203-212
DOI: 10.1007/s13320-018-0499-4

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TONG Y, LI Z, WANG J, et al. High-Speed Mach-Zehnder-OTDR Distributed Optical Fiber Vibration Sensor Using Medium-Coherence Laser. Photonic Sensors, 2018, 8(3): 203-212. https://doi.org/10.1007/s13320-018-0499-4

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Received: 11 March 2018
Revised: 01 June 2018
Published: 25 June 2018
© The Author(s) 2018.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.