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US 12,189,221 B2Granted
Electrically configurable optical filters
AssigneeRaytheon Company
InventorsGary M. Graceffo, Andrew Kowalevicz, Benjamin P. Dolgin
Life of this patent
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Abstract
Aspects and examples are directed to programmable optical finite impulse response filters and optical infinite impulse response filters, which may be implemented as photonic integrated circuits.
Claims20
An optical filter comprising:
- an input configured to receive an input optical signal;
- a first substrate on which at least a portion of the filter is implemented;
- a second substrate coupled to the first substrate;
- an output configured to provide an output optical signal that is a filtered version of the input optical signal;
- a plurality of filter taps coupled to the input and configured to provide a corresponding plurality of weighted signal taps of the input optical signal, each filter tap including a variable delay implemented on the second substrate and an individually addressable attenuator;
- and
- a plurality of summers configured to receive and sum the plurality of weighted signal taps of the input optical signal to produce the output optical signal at the output.
4 more elements
A method of operating an optical filter, comprising:
- implementing at least a portion of the optical filter as a photonic integrated circuit on a first substrate that is a silicon substrate;
- receiving, at an input, an input optical signal;
- operating a plurality of input filter taps to process the input signal to provide a corresponding plurality of weighted signal taps of the input optical signal, each input filter tap including a variable delay implemented on a second substrate coupled to the first substrate and an individually addressable attenuator;
- operating a plurality of summers to receive and sum the plurality of weighted signal taps of the input optical signal to produce an output optical signal, the output optical signal being a filtered version of the input optical signal;
- and
- providing the output optical signal at an output.
3 more elements
Dependencies are inferred from the claim text.