Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1978-03-28
1979-03-20
Newsome, John H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
350 9615, 427 43, 427272, B05D 306
Patent
active
041454570
ABSTRACT:
A method for the production of optical directional couplers has a substrate with optical waveguides formed in a surface thereof which are longitudinally coupled by having the guides extend parallel to each other for a predetermined distance. The waveguides have a higher index of refraction than the substrate. By ion implantation step, the area of the substrate adjacent the surface which is covered has its index of refraction raised, while at the same time, the exposed areas which will form the waveguides is also subjected to the ion bombardment. Thereafter, by a second ion implantation step, the ions penetrate further into the region of the substrate where the waveguides are being formed to raise the index of refraction thereof. By this technique, narrow low-light-loss bends are produced.
REFERENCES:
patent: 3622382 (1971-11-01), Brack et al.
patent: 3666548 (1972-05-01), Brack et al.
Miller, "Bell System Tech. Journ.", Sep. 1969, pp. 2062, 2063.
Mercatili, "Bell System Tech. Journ.", Sep. 1969, pp. 2089-2095.
Schineller et al., "Journ. Opt. Soc. of America", Sep. 1968, pp. 1171-1176.
Newsome John H.
Siemens Aktiengesellschaft
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