Method of measuring the refractive index profile of optical fibe

Details Method of measuring the refractive index profile of optical fibe Method of measuring the refractive index profile of optical fibe

1986-09-08

1988-10-25

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356128, G01N 2141, G01N 2184

Patent

active

047799781

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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