Definitions for "Bragg Grating"
a periodic or aperiodic perturbation of the effective absorption coefficient and/or the effective refractive index of an optical waveguide
a region of a fiber where the refractive index has been modified so that it varies in a precise and periodic way, causing the grating to reflect light of a specific wavelength
a section of glass that has stripes in it where the refractive index has been changed