New method to control the shape of spectral characteristics of Bragg gratings in electrooptical materials

A new method is proposed to control the shape of spectral characteristics of Bragg gratings, which is based on the introduction of electrically controlled shifts of the average refractive index. The shape of the spectral characteristics of Bragg gratings with a complex step structure of the spatial distribution of the average refractive index is calculated. The operative electric control of their shape in a channel optical LiNbO₃ crystal waveguide is experimentally demonstrated.