Optical bend sensor based on measurement of resonance mode splitting of long-period fiber grating

Author

Liu, Yanbing ; Williams, J.A.R. ; Bennion, I.

Author_Institution

Photonics Res. Group, Aston Univ., Birmingham, UK

Volume

12

Issue

5

fYear

2000

fDate

5/1/2000 12:00:00 AM

Firstpage

531

Lastpage

533

Abstract

We report an effective new method of realizing optical bend sensing based on the measurement of bending-curvature encoded resonance mode splitting of long-period fiber grating. The bending induced mode splitting exhibits a near-linear response and the bending sensitivity achieved by this method is nearly four times higher than the previously reported wavelength shift detection method. The evolution of the transmission loss under bending appears dependent on the initial mode coupling strength.

Keywords

diffraction gratings; fibre optic sensors; optical fibre losses; sensitivity; waveguide discontinuities; bending induced mode splitting; bending sensitivity; bending-curvature encoded resonance mode splitting; initial mode coupling strength; long-period fiber grating; near-linear response; optical bend sensor; resonance mode splitting; transmission loss; wavelength shift detection method; Fiber gratings; Optical coupling; Optical fiber devices; Optical fiber sensors; Optical losses; Optical refraction; Optical sensors; Optical variables control; Resonance; Wavelength measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.841276

Filename

841276