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Sensors 2019, 19(8), 1810; https://doi.org/10.3390/s19081810

Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection

1
Department of Telecommunication, Brno University of Technology, Technicka 12, 616 00 Brno, Czech Republic
2
Department of Optical Networks, CESNET a.l.e., Zikova 4, 160 00 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 18 February 2019 / Revised: 9 April 2019 / Accepted: 12 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue I3S 2018 Selected Papers)
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Abstract

Fibre optic infrastructures are very important, and therefore, it is necessary to protect them from fibre cuts. Most fibre cuts are caused by digging activity, and many network operators seek appropriate solutions enabling detection of possible unexpected events (predict these cuts) and subsequent network outages. In most cases, there is no need to locate events, and only information regarding the occurrence of the event is sufficient. Direct detection-based distributed fibre optic sensing systems appear to be an appropriate solution, allowing digging to be detected before the fibre breaks. The average power of such signals is relatively small, and there is no interference with other signals in the fibre. We performed laboratory measurements to compare the sensitivity and accuracy of interferometric and polarization systems for acoustic vibrations. In the case of interferometric systems, the reference and sensing arms were in the same cable, and both were subjected to acoustic vibrations. View Full-Text
Keywords: distributed sensing; digging detection; fibre infrastructure protection; interferometer; polarization distributed sensing; digging detection; fibre infrastructure protection; interferometer; polarization
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Munster, P.; Horvath, T.; Vojtech, J. Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection. Sensors 2019, 19, 1810.

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