Title :
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
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;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2011.2128305
