Method for determining the refractive index profile of optical f

Details Method for determining the refractive index profile of optical f Method for determining the refractive index profile of optical f

1978-04-14

1980-01-01

Corbin, John K.

Optics: measuring and testing

For optical fiber or waveguide inspection

356128, G01N 2122, G01N 2146

Patent

active

041814339

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.

REFERENCES:
Brinkmeyer, E., "Refractive-Index Profile Determination of Optical Fibers _by Spatial Filtering", Applied Optics, vol. 17, No. 1, 1 Jan. 1978.
Brinkmeyer, E., "Refractive-Index Profile Determination of Optical _Fibers from the Diffraction Pattern", Applied Optics, vol. 16, No. 11, Nov. 1977.
Okoshi, et al. "Refractive-Index Profile of an Optical Fiber: Its Measurement by the Scattering-Pattern Method", Applied Optics, vol. 15, No. 11, Nov. 1976.

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