Long-Period Gratings Dynamic Interrogation With Modulated Fiber Bragg Gratings and Optical Amplification

Author

Carvalho, J.P. ; Coelho, L. ; Pontes, M.J. ; Barbero, A.P. ; Martinez, M.A. ; Ribeiro, R.M. ; Weyl, J. ; Baptista, J.M. ; Giraldi, M.T.R. ; Dias, I. ; Santos, J.L. ; Frazão, O.

Author_Institution

Fac. de Cienc., Univ. do Porto, Porto, Portugal

Volume

12

Issue

1

fYear

2012

Firstpage

179

Lastpage

183

Abstract

It is reported a long-period grating (LPG) dynamic interrogation technique based on the modulation of fiber Bragg gratings located in the readout unit of the system. It permits to attenuate the effect of the noise of the electronics in the resolution of the LPG-based sensing head. The concept is tested to detect variations of the external refractive index and a resolution of 2.010 NIR was achieved without system optimization. Additionally, the effect in the sensor resolution when introducing Erbium and Raman optical amplification is experimentally investigated.

Keywords

Bragg gratings; Raman lasers; erbium; fibre optic sensors; optical fibre amplifiers; Raman optical amplification; dynamic interrogation; long period grating; modulated fiber Bragg gratings; sensor resolution; Fiber gratings; Optical fiber sensors; Optical fibers; Refractive index; Stimulated emission; Fiber Bragg gratings (FBGs); long-period gratings (LPGs); optical fiber sensors; sensor interrogation;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2011.2128305

Filename

5732659