Method for determining the refractive index profile of optical fibers and optical fiber preforms
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United States of America Patent
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Jan 1, 1980
Grant Date -
N/A
app pub date -
Apr 14, 1978
filing date -
Apr 14, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This application describes a nondestructive method for determining the refractive index profile of optical fibers and fiber preforms by measuring the density distribution of the light that is focused by the fiber/preform core acting as the lens. The fiber/preform is immersed in an index matching medium and illuminated by means of a collimated light beam directed at right angles to the fiber/preform axis. The density distribution of the light focused by the fiber/preform core is then measured along a direction normal to the fiber/preform axis at a distance L from the axis that is less than the focal length of the fiber/preform. The index profile is determined from these measurements by two numerical integrations.
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