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Application of plasma absorption method in transient radiation-induced loss analysis of optical fibers

The radiation effect of gamma rays on optical fibers is introduced. The experiments of measuring the induced loss of optical fibers by steady-state and transient gamma rays are carried out. The electron density, collision frequency and plasma oscillation frequency of optical fibers under high dose rate pulsed gamma radiation are calculated. A transient radiation-induced loss model based on low temperature plasma absorption is proposed. The transient radiation-induced loss of optical fibers at 600-1600 nm is calculated and measured. The results show that: (1) At the wavelength of 1310 and 1550 nm, the results calculated on plasma absorption method and measured results of transient radiation-induced loss of optical fibers are in the same order of magnitude, and the experimental results verify the applicability of the plasma absorption model; (2) Plasma absorption and atomic defect absorption coexist when pulsed gamma rays act on optical fibers. The transient radiation-induced loss of optical fibers is the result of the interaction of two mechanisms; (3) In the range of 600-1600 nm, with the increase of detection wavelength, the radiation-induced loss of optical fibers is dominated by plasma absorption.