Simultaneous Interrogation of a Hybrid FBG/LPG Sensor Pair Using a Monolithically Integrated Echelle Diffractive Grating

Author

Guo, Honglei ; Xiao, Gaozhi ; Mrad, Nezih ; Yao, Jianping

Author_Institution

Microwave Photonics Res. Lab., Univ. of Ottawa, Ottawa, ON, Canada

Volume

27

Issue

12

fYear

2009

fDate

6/15/2009 12:00:00 AM

Firstpage

2100

Lastpage

2104

Abstract

A simultaneous interrogation technique of a hybrid fiber Bragg grating (FBG) and long-period grating (LPG) sensor pair is proposed and demonstrated using a monolithically integrated echelle diffractive grating (EDG). The operation principle that is based on the monotonic temperature dependence of the EDG transmission wavelengths is presented. Initial results show that a 1-pm resolution and 24-nm interrogation range are achieved by using the proposed interrogation technique, which can effectively be implemented to interrogate hybrid FBG/LPG-based sensor pairs for the discrimination of refractive index (RI)/temperature in RI measurement. The specially designed EDG-based interrogator has the added features of low cost and compact size.

Keywords

Bragg gratings; fibre optic sensors; integrated optics; refractive index measurement; temperature measurement; EDG transmission; EDG-based interrogator; fiber Bragg grating; hybrid FBG-LPG sensor pair; long-period grating sensor; monolithically integrated echelle diffractive grating; refractive index measurement; temperature measurement; wavelength 24 nm; Echelle diffractive grating (EDG); fiber Bragg grating (FBG); long period grating (LPG); refractive index (RI) measurement; sensor interrogation; temperature measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2008.2007426

Filename

4838340