Abstract
A new and nondestructive method is described to measure the refractive-index profile of GeO2-doped optical fibers and preforms within seconds and with accuracy comparable with the best existing techniques. The method is based on the fact that germanium-doped optical fibers and preforms fluoresce at a wavelength near 420 nm when excited by UV radiation below 350 nm. The GeO2-absorptiog spectrum, measured by utilizing a preform slab-sample illuminated with a deuterium lamp coupled to a grating monochromator, exhibits a relatively broad absorption curve centered at 240 nm with a tail extending to nearly 380 nm. The proportionality of fluorescent intensity to dopant concentration arm hence to the index difference has been established for the GeO2-SiO2 binary system by measurements made on preforms with the arrangement shown in Fig. 1.
© 1981 Optical Society of America
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