Reference for citation: Khisamov D. V., Perminov A. V., Azanova I. S., Lunegova E. A., Vakhrushev A. S. Assessment of radiation- induced losses in fiber-optic systems. Journal of Instrument Engineering. 2025. Vol. 68, N 12. P. 1066–1078 (in Russian). DOI: 10.17586/0021-3454-2025-68-12-1066-1078.

Abstract. Experimental results of a study of the effect of ionizing radiation with different dose rates on fiber-optic systems using fibers with a germanosilicate core (GeO2) and an undoped pure silica core (SiO2) are presented. A mathematical approximation of the experimental curves for the growth of radiation-induced optical losses in the fiber is performed using a modified power-law equation that includes the contribution of the ionizing radiation dose rate. A correlation between the values of empirical coefficients and the dose rate of ionizing radiation is experimentally established. A natural logarithmic function equation is proposed for describing the dependence of the empirical coefficients defining the shape of the radiation-induced loss growth curve on the dose rate. An approach to reconstructing the radiation-induced loss growth curve using equations for the dependence of the empirical approximation coefficients on the dose rate is proposed; this technique enables predicting the radiation response of the optical fiber under new conditions without experimental setup. The method demonstrates applicability for single-mode fibers with silica and germanosilicate fiber cores of different designs. Based on the described approach, a methodology is developed for determining correlation equations for empirical coefficients.

Keywords: radiation resistance, optical fiber, radiation-induced optical losses, ionizing effect, mathematical approximation

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