Long Weak FBG Sensor Interrogation Using Microwave Photonics Filtering Technique

Author

Ricchiuti, Amelia Lavinia ; Barrera, David ; Sales, Salvador ; Thevenaz, Luc ; Capmany, J.

Author_Institution

Opt. Quantum & Commun. Group, Univ. Politec. de Valencia, Valencia, Spain

Volume

26

Issue

20

fYear

2014

fDate

Oct.15, 15 2014

Firstpage

2039

Lastpage

2042

Abstract

A system to interrogate photonic sensors based on long weak fiber Bragg gratings (FBGs) is illustrated and experimentally demonstrated. The FBG sensor is able to detect and measure the precise location of several spot events. The principle of operation is based on a technique used to analyze microwave photonics filters. The long weak FBGs are used as quasi-distributed sensors. Several events can be detected along the FBG device with a spatial accuracy of <;1 mm using a modulator and a photodetector with a modest bandwidth of <;500 MHz. The simple proposed scheme is intrinsically robust against environmental changes and easy to reconfigure.

Keywords

Bragg gratings; distributed sensors; fibre optic sensors; microwave filters; microwave photonics; optical fibre filters; optical modulation; photodetectors; FBG device; long weak FBG sensor interrogation; long weak fiber Bragg gratings; microwave photonics filtering technique; modulator; photodetector; photonic sensors; quasidistributed sensors; spatial accuracy; Band-pass filters; Fiber gratings; Microwave filters; Optical fiber filters; Optical fiber sensors; Discrete-time sensors; fiber Bragg gratings; fiber optic sensors; microwave photonics filters; weak FBGs;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2345611

Filename

6877638