The paper describes that the addition of nanosized particles of fumed silica to the polymer coating of fused silica optical fiber is shown to improve long- term mechanical properties of the fiber.Experiment shows that the presence of the additive dramatically reduces the rate of development of surface roughness and that the effect of the additive is to suppress surface dissolution processes.By this method

it delays the onset of the fatigue transition and reduces the strength degra- dation due to zero stress aging.