Simultaneous Interrogation of Multiple Fiber Bragg Grating Sensors Using an Arrayed Waveguide Grating Filter Fabricated in SOI Platform

Author

Trita, Andrea ; Voet, Eli ; Vermeiren, Jan ; Delbeke, Danae ; Dumon, Pieter ; Pathak, Shibnath ; Van Thourhout, Dries

Author_Institution

Dept. of Inf. Technol., Ghent Univ., Ghent, Belgium

Volume

7

Issue

6

fYear

2015

Firstpage

1

Lastpage

11

Abstract

A novel fiber Bragg grating (FBG) interrogator is demonstrated based on an optimized arrayed waveguide grating (AWG) filter. The AWG response is optimized to achieve large crosstalk between the output channels, which allows simultaneous detection of multiple FBG peaks, using centroid signal processing techniques, without constraints on the minimum FBG peak spectral width. The measured interrogator resolution is 2.5 pm, and the total measurement range is 50 nm. The device is fabricated in a silicon-on-insulator platform and has a footprint of only 2.2 × 1.5 mm. A novel approach to minimize the polarization dependence of the device is proposed and experimentally demonstrated.

Keywords

Bragg gratings; arrayed waveguide gratings; fibre optic sensors; integrated optics; optical crosstalk; optical filters; silicon-on-insulator; SOI platform; Si; arrayed waveguide grating filter; centroid signal processing; crosstalk; fiber Bragg grating interrogator; multiple fiber Bragg grating sensors; polarization dependence; silicon-on-insulator platform; Arrayed waveguide gratings; Couplers; Fiber gratings; Optical fibers; Wavelength measurement; Integrated optics devices; Wavelength filtering devices; remote sensing and sensors; wavelength filtering devices;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2015.2499546

Filename

7327126