Abstract

Subject of study. The study analyzes the change in the spectral characteristics of superimposed chirped fiber Bragg gratings during inscription. Aim of study. The dynamics of changes in the spectral characteristics of chirped fiber Bragg gratings during inscription are evaluated. Method. The diffractive structures consisting of four chirped Bragg gratings with a period variable in length are inscribed in a standard telecommunication single-mode optical fiber (G.657.A2) using a KrF excimer laser system and a Talbot interferometer. During the inscription of the fiber structures, the change in the spectral characteristics is estimated depending on the total irradiation dose. Main results. The dependences of the change in the reflection coefficient, the full width at half maximum of the spectral response, and the Bragg resonance wavelength of each chirped Bragg grating of the superimposed structure on the total dose of irradiation are demonstrated. The numerical values of the modulation of the spectral characteristics are presented. Practical significance. The results are important in the field of fiber optics, especially in the development of fiber-optic devices based on Bragg reflectors. The analysis demonstrates the dependences of the change in the spectral characteristics of fiber structures during inscription. The study can be used to optimize the development of fiber-optic devices based on superimposed chirped Bragg gratings, which helps in achieving the required diffractive structure characteristics with high accuracy.

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