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本文从化学动力学角度阐述了光纤中含有微量氮元素,会对光纤衰减产生影响,对GeO_2—SiO-2纤芯光纤研究表明:掺40～80ppm氮的光纤吸收带在640nm和近1000nm处。提高温度,光纤衰减相应增大,同时确定了光纤中氮与锗的反应是化学动力学一级连串反应。根据实验测定的反应速率常数并用Arrhenius方程计算出第一步反应的活化能为19.35Kcal/mole,此值与实验测定的活化能值近乎一致。
In this paper, the chemical kinetics of the fiber containing trace amounts of nitrogen will affect the attenuation of the fiber. The study of GeO_2-SiO-2 fiber shows that the optical absorption band of 40-80ppm nitrogen is at 640nm and nearly 1000nm. At the same time, it was confirmed that the reaction between nitrogen and germanium in the optical fiber is a series of chemical kinetic reaction. According to the experimentally determined reaction rate constant and the Arrhenius equation, the activation energy of the first reaction is calculated to be 19.35 Kcal / mole, which is almost the same as the experimentally determined activation energy.