Methods for measuring dopant concentrations in optical fibers an

Details Methods for measuring dopant concentrations in optical fibers an Methods for measuring dopant concentrations in optical fibers an

1978-03-28

1979-07-17

Smith, Alfred E.

Radiant energy

Luminophor irradiation

Methods

250461R, G01T 110, G01N 2138

Patent

active

041616561

ABSTRACT:
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.

REFERENCES:
patent: 3434774 (1969-03-01), Miller
patent: 4025156 (1977-05-01), Gloge et al.
The Bell System Technical Journal, "Multimode Theory of Graded-Core Fibers", vol. 52, No. 9, Nov. 1973, pp. 1563-1578.

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