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Demultiplexing of interferometrically interrogated fiber Bragg grating sensors using Hilbert transform processing

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2 Author(s)
Rochford, K.B. ; Div. of Optoelectron., Nat. Inst. of Stand. & Technol., Boulder, CO, USA ; Dyer, S.D.

The peak reflectance wavelengths of gratings with reflectance maxima separated by less than 2 nm can be accurately determined through a demultiplexing method based on Hilbert transforms of interferograms. We demonstrate a wavelength demultiplexing of three fiber Bragg gratings (FBG's) with less than 4 pm crosstalk and repeatability and less than 19 pm uncertainty. We anticipate that a large number of gratings can be demultiplexed with a single broadband source and a single receiving interferometer, provided that the interferogram is sampled at accurate intervals slightly above the Nyquist rate

Published in:

Lightwave Technology, Journal of  (Volume:17 ,  Issue: 5 )

Date of Publication:

May 1999

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