Back to results
US 11,681,169 B2Granted
Electrically configurable optical filters
AssigneeRaytheon Company
InventorsGary M. Graceffo, Andrew Kowalevicz, Benjamin P. Dolgin
Life of this patent
Estimating the term…
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.
Claims17
An optical infinite impulse response 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 input filter taps coupled to the input and configured to provide a corresponding plurality of weighted signal taps of the input optical signal;
- a plurality of output filter taps coupled the output and configured to provide a corresponding plurality of weighted signal taps of the output optical signal, each of the plurality of input filter taps and each of the plurality of output filter taps including a variable delay implemented in 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 and the plurality of weighted signal taps of the output optical signal to produce the output optical signal at the output.
5 more elements
A method of operating an optical infinite impulse response filter, comprising:
- receiving, at an input coupled to a first substrate, 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 of the plurality of input filter taps including a variable delay implemented on a second substrate and an individually addressable attenuator;
- and
- operating a plurality of output filter taps to provide a corresponding plurality of weighted signal taps of the output optical signal, each of the plurality of output filter taps including a variable delay implemented on a second substrate and an individually addressable attenuator;
- and
- operating a plurality of summers to receive and sum the plurality of weighted signal taps of the input optical signal and the plurality of weighted signal taps of the output optical to produce an output optical signal, the output optical signal being a filtered version of the input optical signal.
3 more elements
Dependencies are inferred from the claim text.