Chirped fiber-optic Bragg grating interrogator in a multiplexed Bragg grating sensor configuration

Author

Chtcherbakov, Anatoli A. ; Swart, Pieter L.

Author_Institution

Dept. of Electr. & Electron. Eng., Rand Afrikaans Univ., Johannesburg, South Africa

Volume

22

Issue

6

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1543

Lastpage

1547

Abstract

This paper presents a chirped grating interrogator for fiber Bragg grating sensors. The interrogator uses the wavelength dependence of the phase group-delay response of a chirped fiber Bragg grating to determine the Bragg wavelength of the sensor. The sensitivity of the interrogator is determined by the selection of the grating length and the bandwidth. The experimental results demonstrated strain measurements over a range of more than 10 000 μm per meter. Multiplexing can be achieved by using an arrayed-waveguide grating that allows the interrogation of more than one grating sensor with a single chirped grating.

Keywords

Bragg gratings; arrayed waveguide gratings; fibre optic sensors; multiplexing; strain measurement; strain sensors; Bragg grating strain sensor; Bragg wavelength; arrayed-waveguide grating; chirped fiber-optic Bragg grating interrogator; grating sensor; interrogating technique; multiplexed Bragg grating sensor configuration; multiplexing; phase group-delay response; single-chirped grating; strain measurement; wavelength sensitive component; Bragg gratings; Chirp; Fiber gratings; Intensity modulation; Optical fiber sensors; Optical interferometry; Optical modulation; Photodetectors; Propagation delay; Sensor arrays; AWG; Arrayed-waveguide grating; FBG; chirped fiber grating; fiber Bragg grating; multiplexing; strain sensor;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2004.829227

Filename

1303730