Optical waveguide fabrication method

Details Optical waveguide fabrication method Optical waveguide fabrication method

1986-02-19

1987-06-30

Bashore, S. Leon

Glass manufacturing

Processes

Forming product or preform from molten glass

65 182, 65 70, C03B 2502

Patent

active

046768203

ABSTRACT:
A method of fabricating an optical waveguide comprising a plane substrate made of a material having a relatively low refractive index, a plane light propagation layer made of a material having a higher refractive index than the substrate, inserted between two strips of a material having a lower refractive index than its own, and a plane light confining layer of a material having a lower refractive index than the propagation layer. At least one of the layer, meaning either the propagation or the confinement layer, is obtained by causing to circulate in a tube of pure silica the vapors of a gaseous compound of silicon transformable into silica and of a gaseous compound of a doping agent transformable into one of its own oxides and heating said vapors sufficiently to obtain the deposit of a layer of doped silica having a refractive index different from that of the pure silica. Modifacations to the refractive indices can be obtained by either diffusing or implanting dopants, or alternatively by selective elimination of dopants.

REFERENCES:
patent: 3884336 (1984-08-01), Huber et al.
patent: 4116530 (1978-09-01), Bellavance et al.
patent: 4243398 (1981-01-01), Nomura et al.
patent: 4262995 (1981-04-01), Tangonan

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