Substrate stack construction for enhanced coupling efficiency of optical couplers
AssigneeTexas Instruments Incorporated
InventorsJerome K. Butler, Lily Y. Pang, Philip A. Congdon
Life of this patent
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Abstract
A grating (461) assisted coupling of a semiconductor waveguide to a dielectric waveguide (451) is provided with one or more reflective stacks (330, 332, 334) to enhance the coupling efficiency. The glass or dielectric core (458) may be efficiently butt-coupled to the core of an optical fiber (470). A laser and semiconductor waveguide, reflective stacks coupling grating, and dielectric waveguide are integrated on a single substrate. Further, multiple lasers (410, 420, 430, 440) with differing lasing frequencies may be integrated and their outputs grating coupled into a single dielectric waveguide (450) for wavelength division multiplexing.
Claims7
A coupler between a semiconductor waveguide and a dielectric waveguide, comprising:
- (a) a grating between said semiconductor waveguide and said dielectric waveguide;
- and
- (b) at least two reflective stacks adjacent said semiconductor and said dielectric waveguides wherein each reflective stack is configured to reflect power lost to the substrate from a leaky mode of the grating into the dielectric waveguide.
An integrated circuit, comprising:
- (a) a semiconductor substrate;
- (b) a semiconductor waveguide on said substrate;
- (c) a dielectric waveguide overlaying said semiconductor waveguide;
- (d) a coupling grating between said semiconductor waveguide and said dielectric waveguide;
- and
- (e) at least two reflective stacks adjacent said grating located below said grating and on said semiconductor substrate wherein each reflective stack is configured to reflect power lost to the substrate from a leaky mode of the grating into the dielectric waveguide.
Dependencies are inferred from the claim text.