Novel signal demodulation technique to estimate the amount of chirp in fiber Bragg gratings

Kondiparthi, Mahesh (2010) Novel signal demodulation technique to estimate the amount of chirp in fiber Bragg gratings. In: Conference on Fiber Optic Sensors and Applications VII, APR 07-08, 2010, Orlando, FL.

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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.

Item Type:	Conference Paper
Series.:	Proceedings of SPIE-The International Society for Optical Engineering
Publisher:	The International Society for Optical Engineering.
Additional Information:	Copyright of this article belongs to The International Society for Optical Engineering.
Keywords:	Reflectivity; central wavelength; fiber Bragg grating; linear chirp; strain/temperature gradient
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	07 Mar 2011 06:35
Last Modified:	07 Apr 2011 07:08
URI:	http://eprints.iisc.ac.in/id/eprint/35915

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