Broadband high-channel-count phase-only sampled fiber Bragg gratings based on spectral Talbot effect

A novel method of generating broadband high-count-channel optical filters in phase-only sampled fiber Bragg grating based on spectral Talbot effect is presented. Integer and/or fractional Talbot effects are examined using both Dammann and multi-level discrete phase-only sampling function. It is found that very high-count channels in a wide spectral band that covers the whole C band can be obtained with very limited number of discrete phase transitions in each sampling period. It provides a novel method for making high-channel-count FBG filters that is otherwise difficult or impossible using conventional discrete phase-only sampled FBGs.