Center wavelength of light reflected from fiber optic grating
An Optical Fiber Bragg Grating (FBG) is a periodic modulation of the refractive index within the core of an optical fiber. This structure acts as a wavelength-selective reflector, transmitting most wavelengths while reflecting a narrow band centered at the Bragg wavelength (λ B). A variation of the period of the grating inscripted in a fiber optic – induced by mechanical or thermal perturbation – causes a shift of the reflected peak wavelength, due to the related optical path length variation.
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