Synthesis of flat-top bandpass filters using two-band rejection long-period fiber gratings

Abstract

We propose a synthesis method based on the genetic algorithm for designing flat-top bandpass filters using two-band rejection long-period fiber grating (LPFG) filters. In the proposed method, the LPFG structure constructed by concatenating the twoband rejection filters is used as the initial parameter to easily design good flat-top bandpass filters in a wavelength range.