Abstract
We demonstrate an innovative method for a real-time interrogation of fiber
Bragg gratings based on low-coherence spectral interferometry of noiselike
pulses. By analyzing the spectral interference at the output of a Michelson
interferometer we obtained the impulse response of the grating with a time
resolution of . Using the Gabor transformation, we could directly detect nonuniform
regions inside the grating and could measure the spatial dependence of the
resonance wavelength along the grating.
© 2001 Optical Society of America
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