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US 11,641,531 B2Granted
Multi-mode interference coupler-based flat compressive and transform imager
AssigneeThe Charles Stark Draper Laboratory, Inc.
InventorsMichael Moebius, Julian Brown, Steven Spector, Benjamin Lane, Alan Zhou, Hannah Anne Clevenson, Lucas David Benney
Life of this patent
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Abstract
A compressive/transform imager comprising a lens array positioned above input ports for collecting light into the input ports, waveguides routing the light from the input port to waveguide mixing regions (e.g. multi-mode interference couplers), and detectors for receiving outputs of the waveguide mixing regions.
Claims9
A method of extracting an image from a transform imager, the method comprising:
- receiving light at a first plurality of input ports of a transform imager,
- directing the light to a waveguide mixing region via a waveguide array;
- mixing the light within the waveguide mixing region to produce mixed light;
- receiving the mixed light at a plurality of detectors from the waveguide mixing region;
- measuring responses from the plurality of detectors to the received mixed light in order to perform calibration;
- selecting measured responses corresponding to peaks in the received mixed light;
- adjusting the calibration in order to recover different targeted information;
- and
- wherein the transform imager is a compressive transform imager wherein some outputs from the waveguide mixing region are terminated, such that the first plurality of input ports has a number of input ports greater than a number of detectors in the plurality of detectors.
6 more elements
A transform imager, comprising:
- a first plurality of input ports configured to receive light,
- a waveguide array configured to direct the received light to a waveguide mixing region for mixing the light to produce mixed light at a plurality of outputs thereof,
- a plurality of detectors configured to receive the mixed light and generate responses based on the detection of the received light,
- wherein some of the outputs of the waveguide mixing region are terminated such that a number of the plurality of the input ports is greater than a number of the plurality of the detectors;
- wherein the transform imager is configured to:
- measure the responses from the plurality of the detectors,
- select measured responses corresponding to peaks in the mixed light, and
- adjust a calibration to recover different targeted information.
5 more elements
Dependencies are inferred from the claim text.