Application of plasma absorption method in transient radiationinduced loss analysis of optical fibers

摘要

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