US 12,189,221 B2
Electrically configurable optical filters
Gary M. Graceffo, Burke, VA (US); Andrew Kowalevicz, Arlington, VA (US); and Benjamin P. Dolgin, Alexandria, VA (US)
Assigned to Raytheon Company, Tewksbury, MA (US)
Filed by RAYTHEON COMPANY, Waltham, MA (US)
Filed on Jun. 16, 2023, as Appl. No. 18/211,004.
Application 18/211,004 is a division of application No. 16/913,138, filed on Jun. 26, 2020, granted, now 11,681,169, issued on Jun. 20, 2023.
Claims priority of provisional application 62/866,907, filed on Jun. 26, 2019.
Prior Publication US 2023/0333416 A1, Oct. 19, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/03 (2006.01)
CPC G02F 1/0344 (2013.01) 20 Claims
OG exemplary drawing
 
1. 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.