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. 2017 Nov 1;17(11):2511. doi: 10.3390/s17112511

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Experimental setup of the hybrid Raman-DTS and $ϕ$ -OTDR system for simultaneous measurements of vibration and temperature. DFB-LD: Distributed Feedback-Laser Diode, EDFA: Erbium Doped Fiber Amplifier, OBPF: Optical Bandpass Filter, MZM: Mach–Zehnder Modulator, WFG: Waveform Generator, AOM: Acousto-optical Modulator, OC: Optical Circulator, APD: Avalanche Photodetector, PC: Polarization Controller. (Adapted from [10].)