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By utilizing the multiple phase-shift and the sampling techniques, we demonstrate, for the first time, a novel multichannel notch filter with a multipliable channel count. Three kinds of notch filters with channel counts of 51, 102, and 153 are obtained by thermally inducing one, two, and three pi phase-shifts into a 51-channel phase-only sampled fiber Bragg grating, respectively. The proposed technique...
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