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

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...

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Bibliographic Details
Published in:Journal of lightwave technology 1999-05, Vol.17 (5), p.831-836
Main Authors: Rochford, K.B., Dyer, S.D.
Format: Article
Language:English
Subjects:
Applied sciences
Bragg gratings
Demultiplexing
Exact sciences and technology
Fiber gratings
Frequency
Optical filters
Optical interferometry
Optical sensors
Reflectivity
Sensor arrays
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Wavelength measurement
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Summary: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.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.762900