Process for producing a planar optical waveguide

Details Process for producing a planar optical waveguide Process for producing a planar optical waveguide

1987-12-02

1989-07-25

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 312, 65 182, 65 602, 65DIG15, 65DIG16, 156655, 156657, C03B 804, C03C 2300, C03C 1500

Patent

active

048510254

ABSTRACT:
Planar single-mode optical waveguides which can conduct light with defined polarisation have so far been embedded in, for example, a cladding made from crystalline LiNbO.sub.3. The crystalline structure of the cladding produces disadvantageous properties such as the fact that the birefringence depends on the geometric profile of the guide, relatively high optical loss, poor fibre coupling, birefringence rigidly fixed by material constants, and a costly manufacturing process. The new process results in an optical waveguide in which both the cladding and the actual guide itself are made of glass with a certain composition, thereby avoiding the disadvantages stated. With the help of a non-isothermal plasma CVD process a light-guiding core region (1) is surrounded on a substrate (4) by cladding layers (2, 2') and a cladding region (3, 3'), the thermal coefficient of longitudinal expansion of the cladding region (3, 3') differing markedly from that of the two homogeneous cladding layers (2, 2'). The core region has either a higher or approximately the same refractive index as the cladding region. Use of the optical waveguide is as a polarisation-receiving or polarising single-mode optical waveguide.

REFERENCES:
patent: 4179189 (1979-12-01), Kaminow et al.
patent: 4395270 (1983-07-01), Blankenship
patent: 4549891 (1985-10-01), Plummer
patent: 4652290 (1987-03-01), Cho
patent: 4765819 (1988-08-01), Kersten

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