Numerical analysis of reflection spectrum of linearly chirped fiber Bragg gratings
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Optical Engineering Key Laboratory of Chongqing City, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China
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Corresponding author:
LIANG Yi-ping, liangyipinglyp@yahoo.com.cn
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Received Date:
2011-12-05
Accepted Date:
2011-12-23
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Abstract
In order to study the properties of linearly chirped fiber Bragg grating(LCFBG),and further use it in optical fiber lasers,the coupling theory of the LCFBG was introduced.By using four-order Runge-Kutta method,transfer matrix method and the control variable method,the dependence of reflectivity of the LCFBG on chirp coefficient,direct current index change spatially averaged over a grating period,and the dependence of full width at half maximum on the length of the LCFBG were simulated.The results show that linearly chirped fiber Bragg gratings can broaden the bandwidth.Based on this conclusion,the gratings are used as cavity mirrors of fiber lasers can expand the output spectrum,which can be used as a broadband light source.
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