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US 11,886,004 B2Granted
Planer lightwave circuit
AssigneeNippon Telegraph and Telephone Corporation
InventorsJunji Sakamoto, Toshikazu Hashimoto
Life of this patent
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Abstract
Provided is a planar lightwave circuit in which stress on a substrate is reduced to decrease the curve of the substrate. The planar lightwave circuit is formed by layering a glass film on the substrate. When the optical axis direction from an input waveguide toward an output waveguide is in the longitudinal direction of the substrate, a plurality of grooves are formed in a line in the transverse direction of the substrate.
Claims7
A planar lightwave circuit formed by:
- layering a glass film on a substrate;
- forming a plurality of input waveguides;
- forming an output waveguide that is coupled to the plurality of input waveguides;
- and
- forming a plurality of grooves in a line in central part of the substrate between the plurality of input waveguides and the output waveguide.
2 more elements
Dependencies are inferred from the claim text.