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A new kind of multi-channel–channel filter, based on the strongly discretely chirped sampled Bragg grating, has been proposed and studied. Compared with the previous methods, the step-chirp number is much smaller or the nonlinearity chirp inherent in the strongly chirped holographic phase mask can be avoided. Based on the analysis and numerical simulations, it has been shown that high-performance...
Based on a sampled fiber Bragg grating, a novel approach to obtain high channel-count comb filters is proposed for wavelength-division-multiplexing (WDM) system in this letter. There is a non-continuous linear chirped structure like a ladder in grating period. And refractive index modulation amplitude with Hamming spatial profile is used within the samples. The 26-channel comb filter with channel...
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