Chirped Bragg grating is a kind of reflective volume Bragg grating with variable grating period. At the different period of grating, the Bragg wavelength is different, the grating will diffraction the incident light of different wavelength, that is, the position of inflection of incident light at different wavelengths in the grating is different. which is the physical basis of the chirped Bragg grating with large bandwidth and large dispersion.
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