Chiral fiber Bragg gratings for vortex signal generation

In this paper the chiral fiber Bragg gratings (ChFBG) for generation of fiber modes carrying orbital angular momentum (OAM, vortex modes) are considered. Within the framework of the article, a generalized mathematical model of ChFBG is presented including an arbitrary function of apodization and chirping, which makes it possible to calculate gratings that form vortex modes of a given order for the required frequency range with the required reflection coefficient. In addition, a matrix method based on the mathematical apparatus of the coupled modes theory for describing ChFBG is proposed, simulation of the considered fiber structures is carried out.

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