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/spl times/3 coupler. Laboratory data show that a resolution of /spl sim/10 n/spl epsiv///spl radic/(Hz) RMS is achievable with inherent insensitivity to source intensity variations.

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