Abstract
Superstructure fiber Bragg gratings (FBGs) have been comprehensively analyzed with Fourier theory and experimentally demonstrated. By using Fourier transforms, it has been proven that (1) the traditional uniform FBG produces only a single response in the spectrum, (2) multiple phase-sampled gratings can be regarded as independent interleaved FBGs with different phases, and (3) the multiple phase sampling technique has the capacity to densify the spectral channels. Based on Fourier theory, for the first time to the author's knowledge, a kind of superstructure FBGs with multiple ultranarrow transmission windows, obtained by introducing a phase shift into the center of grating, is proposed and has been confirmed experimentally.
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