Gradient index optical waveguide

Details Gradient index optical waveguide Gradient index optical waveguide

G - Physics

02

B

88/97.2

G02B 5/172 (1980.01)

Patent

CA 1133736

Div. I GRADIENT INDEX OPTICAL WAVEGUIDE ABSTRACT OF THE INVENTION In the method of making a preform for a high numerical aperture gradient index optical waveguide, the concentration of two dopant constituents is changed during fabrication. Concentration of the first dopant, GeO2 is changed radially as the preform is built up in order to produce the desired radial refractive index gradient. The concentration of the second dopant, B2O3 is changed radially to compensate for the radial change in thermal expansion coefficient caused by the varying GeO2 concentration. B2O3 is added to the cladding layer to make the thermal expansion coefficient of the cladding equal to or greater than the composite thermal expansion coefficient of the core. The magnitude of residual tension at the inner surface caused by thermal expansion gradients is reduced and premature cracking of the preform is eliminated.

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