Time-Domain Distributed Fiber Sensor With 1 cm Spatial Resolution Based on Brillouin Dynamic Grating

Author

Song, Kwang Yong ; Chin, Sanghoon ; Primerov, Nikolay ; Thévenaz, Luc

Author_Institution

Inst. of Electr. Eng., Ecole Polytech. Fed. de Laussane, Lausanne, Switzerland

Volume

28

Issue

14

fYear

2010

fDate

7/15/2010 12:00:00 AM

Firstpage

2062

Lastpage

2067

Abstract

We demonstrate an optical time-domain distributed fiber sensor showing the highest spatial resolution ever reported based on Brillouin dynamic grating in a polarization-maintaining fiber. In our scheme, the acoustic gratings containing the information on the local Brillouin frequency are generated by a long pump pulse in one polarization, and read out by a short probe pulse in the orthogonal polarization at a clearly distinct optical frequency from the pump. In the experiment, distributed temperature measurements over a 20 m fiber are performed with 1.2 cm spatial resolution.

Keywords

Brillouin spectra; diffraction gratings; fibre optic sensors; optical fibre polarisation; temperature measurement; Brillouin dynamic grating; acoustic grating; distance 20 m; distributed temperature measurement; high spatial resolution; local Brillouin frequency; long pump pulse; orthogonal polarization; polarization maintaining fiber; short probe pulse; time domain distributed fiber sensor; Brillouin scattering; gratings; optical fiber measurements; optical fibers;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2010.2050763

Filename

5473122