Radiation-Induced Absorption of Light in Undoped-Silica-Core Optical Fibers in the Near-Infrared Range: Effect of Drawing Conditions

Eight identical undoped-silica-core, fluorosilicate-cladding preforms have been drawn into optical fibers under different drawing regimes (temperature T , tension, and speed). Next, the fibers have been γ -irradiated, with radiation-induced absorption (RIA) of light measured at the wavelength λ = 1.55 µ m and at the dose of 2.5 kGy (7.4–7.6 Gy/s). RIA is found to strongly increase with an increase in T , which proves to be the main drawing parameter determining the fiber radiation resistance. It is established that the RIA dependence on T −1 is exponential.