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Reflectivity and Braggs Wavelength in FBG

Author(s): Dinesh Arora, Dr.Jai Prakash, Hardeep Singh & Dr.Amit Wason

Journal: International Journal of Engineering
ISSN 1985-2312

Volume: 5;
Issue: 5;
Start page: 341;
Date: 2011;
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Keywords: Fiber Bragg Grating | Bragg Wavelength | Reflection | Number of Grids | Grating length | Pitch

We have presented an analytical model of splitters based on Fiber Bragg Grating used to detect a Braggwavelength from the number of wavelengths which are traveling in an optical fiber. The number of gridsand grating length can be used as a wavelength shifter. This paper presents experimental results that areused to show the effect of number of grids, the length of the grating on the Bragg wavelength andreflectivity of Fiber Bragg Grating (FBG). The pitch of grating is directly proportional to the grating lengthand inversely proportional to number of grids. When the grating length is fixed and the number of grids isincreased, the Bragg wavelength decreases resulting in increased reflectivity. This increased reflectivity isvery small. Further when the number of grids is kept constant and the grating length is increased theBragg wavelength increases. The effect of this increase in grating length on reflectivity is a very small. Inour model, the effectiveness of the grating in extracting the Braggs wavelength is nearly 100%.
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