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US 6,674,950 B2Granted
Optical waveguide crossing and method of making same
AssigneeSarnoff Corporation
InventorsLiyou Yang, Nagandranath Maley
Life of this patent
Estimating the term…
Abstract
A photonic device including: at least first and second optical waveguides; and, a buffer at least partially interposed between the first and second optical waveguides where they at least partially overlie one-another so as to at least partially mitigate interference between optical signals traversing the first and second optical waveguides.
Claims32
A photonic device comprising:
- at least first and second optical waveguides;
- and,
- a buffer at least partially interposed between said first and second optical waveguides and forming a sufficiently smooth profile elevating said second of said optical waveguides with respect to said first of said optical waveguides where they at least partially overlie one-another so as to at least partially mitigate loss in optical signals traversing said second optical waveguide due to said elevation.
A method for making a photonic integrated circuit, said method comprising:
- forming a first optical waveguide;
- forming a buffer over at least a portion of said first optical waveguide;
- and,
- forming a second optical waveguide over at least a portion of said buffer;
- wherein said buffer forms a sufficiently smooth profile elevating said second of said optical waveguides with respect to said first of said optical waveguides where they at least partially overlie one-another so as to at least partially mitigate interference between optical signals traversing said first and second optical waveguides.
2 more elements
An optical communications device comprising:
- a plurality of optical waveguides crossing one another;
- and,
- a buffer positioned above at least one of said waveguides and forming a sufficiently smooth profile elevating at least one other of said waveguides over said at least one of said waveguides where they cross to at least partially mitigate losses in signals traversing said at least one and one other of said plurality of waveguides due to said crossing and losses in optical signals traversing said at least one other of said optical waveguide due to said elevation.
Dependencies are inferred from the claim text.