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US 5,179,614 AGranted
Quartz optical waveguide and method for producing the same
AssigneeSumitomo Electric Industries, Ltd.
InventorsHiroo Kanamori, Masumi Ito, Shinji Ishikawa, Haruhiko Aikawa, Sumio Hoshino
Life of this patent
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Abstract
A quartz optical waveguide comprising a substrate, a ridge-form core part formed on said substrate and a part which surrounds said core part and has a lower refractive index than that of said core part, wherein a refractive index changes continuously at an interface between said core part and said part having the lower refractive index, which has a decreased transmission loss and a connection loss when connected with an optical fiber.
Claims2
A method for producing a quartz optical waveguide which comprises the steps of:
- forming a buffer layer on a substrate;
- forming a ridge form core layer on said buffer layer;
- forming a cladding layer on said buffer layer and ridge form core layer, said cladding layer and buffer layer each having a lower refractive index than that of said ridge form core layer;
- and
- heating to diffuse a component contained within at least one of said ridge form core layer, said cladding layer and said buffer layer which changes a refractive index of an interface between said ridge form core layer and said buffer and cladding layers, said refractive index of said interface varies continuously in a direction away from a center of said ridge form core layer.
2 more elements
Dependencies are inferred from the claim text.