High performance optical comb filter using full duty cycle based periodically chirped- sampled fiber Bragg grating

A novel design of optical comb filter using the effect of periodic chirp and full duty cycle sampling in sampled fiber Bragg grating is proposed and numerically demonstrated. The spectral Talbot phenomenon is realized in the proposed periodically chirped Gaussian-sampled fiber Bragg grating (PC-GSFBG). The channel counts of the filter can be controlled either or both by using FWHM and chirp coefficient. The lesser index modulation can be used to improve channel spacing.