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. 2013 Jan 31;13(2):1836–1845. doi: 10.3390/s130201836

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Experiment Setup. OFDR: optical frequency-domain reflectometry; TLS: tunable laser source; DAQ: data acquisition; EOM: electro-optic modulator; OC: optical coupler; PC: polarization controller; PD: photodetector; PBS: polarization beam splitter; WDM: wavelength division multiplexer; FUT: fiber under test. Bottom inset shows the sensing fiber section, where a 0.5 m long fiber could be applied axial strain by attaching the fiber on the translation stage, and a 0.7 m section is placed in the oven for varying temperature; the two sections are separated by about 1.5 m.