Method of measuring the refractive index profile of optical fibers
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United States of America Patent
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Oct 25, 1988
Grant Date -
N/A
app pub date -
Sep 8, 1986
filing date -
Sep 8, 1986
priority date (Note) -
Expired
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Abstract
A method is disclosed for determining the refractive index profile of an optical fiber wherein light from an intense optical source is focused at the bare fiber end portion of the test fiber. A small amount of light will be coupled into the optical fiber where for the short length of uncoated fiber only cladding modes are excited. The index of refraction is determined directly by analyzing the intensity distribution emitted from the optical fiber with a lens system having a limited numerical aperture.
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