The Distributed OTDR Measuring System with UWFBGs based on Correlation Degree Spectrum

DOI

10.2991/ifmeita-17.2018.94How to use a DOI?

Keywords

UWFBGs, Correlation degree spectrum, CW noise, micro-strain, distributed Algorithm

Abstract

The distributed OTDR measuring system based on correlation degree spectrum of UWFBGs is proposed. The traditional OTDR system uses a white light source to reduce the noise signal induced by the interference from multiple reflections between UWFBGs (reflectivity of each to be 0.1%), in addition we used the optical pulse with high extinction ratio (>40dB) to reduce the noise floor of OTDR trace, so that the large number (330) of the FBGs can be detected at the end of 850m due to the low noise floor. The spectrums of 330FBGs have been characterized with a high-precision tunable filter at the receiver end. By calculating the correlation degree of adjacent spectrum we improved SNR to 35dB. The wavelength shift accuracy is 3.2pm. The accuracy of measured temperature and strain are respectively 3.2and 0.32øC.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Rong Zhou
AU  - Qi Zhang
PY  - 2018/02
DA  - 2018/02
TI  - The Distributed OTDR Measuring System with UWFBGs based on Correlation Degree Spectrum
BT  - Proceedings of the 2nd International Forum on Management, Education and Information Technology Application (IFMEITA 2017)
PB  - Atlantis Press
SP  - 542
EP  - 549
SN  - 2352-5398
UR  - https://doi.org/10.2991/ifmeita-17.2018.94
DO  - 10.2991/ifmeita-17.2018.94
ID  - Zhou2018/02
ER  -