Methods of making planar lightwave guides

Details Methods of making planar lightwave guides Methods of making planar lightwave guides

1986-10-16

1988-07-12

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 182, 65 301, 65 602, 350 9612, 372 45, C03P 804, C03C 2100

Patent

active

047567341

ABSTRACT:
A method of making a planar lightwave-guide with light-conducting core zones by precipitation out of a gaseous phase a thin, glass-like strata onto a substrate in accordance with a controlled schedule so as to allow a predetermined refractive index curve to be obtained to thereby form a light-conducting core zone and sheathing layer adjacent to the core zone. The improvement is characterized in that the precipitation out of the gaseous phase is obtained by application of a heterogeneous reaction and in that initially a first layer with a doping medium which decreases the refractive index is applied to the substrate and thereafter a masking layer is applied on top of the first layer to act as a diffusion barrier with respect to the doping medium. The masking layer is structured by conventional masking technology in accordance with a desired strip or band pattern. Thereafter, the substrate provided with these layers is heated to a degree sufficient to diffuse the doping medium out of the unmasked regions of the first layer and thus forming at least a portion of the core zone of the light-conducting regions. Further layers are then applied in which the refractive indices are controlled to complete the lightwave-guide.

REFERENCES:
patent: 4400052 (1983-08-01), Alferless
patent: 4652290 (1987-03-01), Cho
Hass et al.; Physics of Thin Films, vol. 5, 1969; Academic Press, N.Y., p. 238.
Crow et al; Applied Optics, vol. 14, No. 3, 3-1975; pp. 580-585.

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