Method for making planar lightwave guides

Details Method for making planar lightwave guides Method for making planar lightwave guides

1986-10-16

1988-08-23

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 182, 65 31, 65 602, 350 9612, 372 45, C03B 804, C03C 2100

Patent

active

047658193

ABSTRACT:
A planar lightwave guide with light-conducting core zones in light conducting strips is made by the precipitation out of a gaseous phase onto a substrate a thin, glass-like strata in accordance with a programmed schedule so as to allow a predetermined refractive index curve to be obtained to thereby form a light-conducting core zone and protective sheathing layers adjacent to the core zone. The improvement in the method is characterized in that the precipitation out of the gaseous phase is obtained by application of a heterogeneous reaction and in that after the formation of the light-conducting strips, the refractive index of the core-forming strata is modified in a targeted manner in a lateral marginal region of the strips by diffusing out the doping substance which determines the refractive index curve in the core zones. Subsequently these strips and the substrate are coated with a covering layer of a material having a lower refractive index than that of the core zone material.

REFERENCES:
patent: 3647406 (1972-03-01), Fisher
patent: 3817730 (1974-06-01), Uchida
patent: 3843228 (1974-10-01), Yoshiyagawa
patent: 4652290 (1987-03-01), Cho
Hass et al; Physics of Thin Films, vol. 5, 1969; Academic Press, N.Y., p. 238.

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