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Based on the coupled-mode equations and transfer matrix theory, the reflective spectrums of a silica FBG centered at 1.9μm and a fluoride FBG centered at 2.8μm with different length and refractive index perturbation were calculated, respectively. The results show that the peak reflectivity and the spectrum width increase and decrease with the increasing FBG length, respectively. An increase in refractive...
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