Methods for measuring dopant concentrations in optical fibers and preforms

摘要

Techniques are disclosed for determining the distribution of dopants in optical fibers and fiber preforms by observing the reaction of a fiber/preform to uv illumination. One technique measures the fluorescence induced by the uv. A second method measures the absorption of uv by the dopants. Thus, by determining the intensity distribution of radiant energy from the fiber/preform, the dopant distribution can be determined as a function of distance from the center of the fiber/preform.