Title :
Passive, light intensity-independent interferometric method for fibre Bragg grating interrogation
Author :
Todd, M.D. ; Johnson, G.A. ; Chang, C.C.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
10/28/1999 12:00:00 AM
Abstract :
The authors describe a passive technique for sensing the strain-induced wavelength shift of a fibre Bragg grating (FBG) using a Mach-Zehnder interferometer that utilises a 3×3 coupler. Laboratory data show that a resolution of ~10 nε/√(Hz) RMS is achievable with inherent insensitivity to source intensity variations
Keywords :
Bragg gratings; Mach-Zehnder interferometers; fibre optic sensors; optical fibre testing; strain sensors; Mach-Zehnder interferometer; coupler; fibre Bragg grating; fibre optic strain sensor; light intensity dependence; passive measurement; strain-induced wavelength shift;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19991328
