Abstract
A nondestructive on-line monitoring method to estimate the refractive-index profile in vapor-phase axial deposition (VAD) processing has been developed. This technique is developed on the basis of the deposition properties of a SiO 2 -GeO 2 glass particles in the flame hydrolysis reaction. The profile monitoring accuracy is \pm 7 \times 10^{-5} in refractive-index difference. The estimated profiles during the porous preform fabrication are well coincided with those of the consolidated preform. The average bandwidth properties of graded-index fibers produced by adjusting the fabrication conditions, to be optimized with using present method, is 2.5 GHz . km0.9at 1.3-μm wavelength.
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