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Proceedings Paper

Novel signal demodulation technique to estimate the amount of chirp in fiber Bragg gratings
Author(s): Mahesh Kondiparthi
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Paper Abstract

A novel detection technique to estimate the amount of chirp in fiber Bragg gratings (FBGs) is proposed. This method is based on the fact that reflectivity at central wavelength of FBG reflection changes with strain/temperature gradient (linear chirp) applied to the same. Transfer matrix approach was used to vary different grating parameters (length, strength and apodization) to optimize variation of reflectivity with linear chirp. Analysis is done for different sets of 'FBG length-refractive index strength' combinations for which reflectivity vary linearly with linear chirp over a decent measurement range. This article acts as a guideline to choose appropriate grating parameters in designing sensing apparatus based on change in reflectivity at central wavelength of FBG reflection.

Paper Details

Date Published: 20 April 2010
PDF: 9 pages
Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 767716 (20 April 2010); doi: 10.1117/12.856127
Show Author Affiliations
Mahesh Kondiparthi, Indian Institute of Science (India)


Published in SPIE Proceedings Vol. 7677:
Fiber Optic Sensors and Applications VII
Alexis Mendez; Henry H. Du; Anbo Wang; Eric Udd; Stephen J. Mihailov, Editor(s)

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