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

Mahesh Kondiparthi

doi:10.1117/12.856127

20 April 2010 Novel signal demodulation technique to estimate the amount of chirp in fiber Bragg gratings

Mahesh Kondiparthi

Proceedings Volume 7677, Fiber Optic Sensors and Applications VII; 767716 (2010) https://doi.org/10.1117/12.856127
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

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.

Citation Download Citation

Mahesh Kondiparthi "Novel signal demodulation technique to estimate the amount of chirp in fiber Bragg gratings", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 767716 (20 April 2010); https://doi.org/10.1117/12.856127

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