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Self-Referenced Photon Counting OTDR Technique for Quasi-Distributed Fiber Bragg Gratings Sensors

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5 Author(s)
Voisin, V. ; Electromagn. & Telecommun. Unit, Univ. de Mons, Mons, Belgium ; Caucheteur, C. ; Kinet, D. ; Mégret, P.
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We demonstrate the operating principle of a quasi-distributed monitoring system based on the concatenation of low-reflectance identical fiber Bragg gratings (FBGs) and interrogated by means of a photon counting optical time domain reflectometer (v-OTDR). A filter placed in the path between the FBGs and the photon-counting OTDR impacts the height of the reflection peaks in the OTDR trace as a function of their resonance wavelength, and therefore of the measurand. The proposed technique is very easy and allows interrogating a few tens of sensors in a measurement time that does not exceed a few seconds, whatever the number of sensors.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 1 )