US 12,247,909 B2
Tunable add-drop filter with an active resonator
Sahin Kaya Ozdemir, St. Louis, MO (US); Lan Yang, St. Louis, MO (US); Bo Peng, St. Louis, MO (US); and Faraz Monifi, San Diego, CA (US)
Assigned to Washington University, St. Louis, MO (US)
Filed by Washington University, St. Louis, MO (US)
Filed on May 23, 2023, as Appl. No. 18/322,118.
Application 18/322,118 is a continuation of application No. 17/446,525, filed on Aug. 31, 2021, granted, now 11,754,488.
Application 17/446,525 is a continuation of application No. 15/981,228, filed on May 16, 2018, granted, now 11,131,619, issued on Sep. 28, 2021.
Application 15/981,228 is a continuation of application No. 15/801,823, filed on Nov. 2, 2017, granted, now 10,782,289, issued on Sep. 22, 2020.
Application 15/801,823 is a continuation of application No. 15/019,942, filed on Feb. 9, 2016, abandoned.
Application 15/981,228 is a continuation of application No. 14/659,427, filed on Mar. 16, 2015, abandoned.
Application 14/659,427 is a continuation in part of application No. 13/460,170, filed on Apr. 30, 2012, granted, now 9,012,830, issued on Apr. 21, 2015.
Application 13/460,170 is a continuation in part of application No. 12/966,785, filed on Dec. 13, 2010, granted, now 8,704,155, issued on Apr. 22, 2014.
Application 15/981,228 is a continuation of application No. 15/185,369, filed on Jun. 17, 2016, abandoned.
Application 15/981,228 is a continuation of application No. 15/430,426, filed on Feb. 10, 2017, abandoned.
Application 15/981,228 is a continuation of application No. 15/677,646, filed on Aug. 15, 2017, abandoned.
Application 15/185,369 is a continuation of application No. 14/897,863, granted, now 9,766,402, issued on Sep. 19, 2017, previously published as PCT/US2014/041877, filed on Jun. 11, 2014.
Claims priority of provisional application 62/113,610, filed on Feb. 9, 2015.
Claims priority of provisional application 61/285,869, filed on Dec. 11, 2009.
Claims priority of provisional application 62/181,180, filed on Jun. 17, 2015.
Claims priority of provisional application 62/333,667, filed on May 9, 2016.
Claims priority of provisional application 62/293,746, filed on Feb. 10, 2016.
Claims priority of provisional application 61/834,113, filed on Jun. 12, 2013.
Prior Publication US 2023/0304916 A1, Sep. 28, 2023
Int. Cl. G01N 15/14 (2024.01); G01N 15/1434 (2024.01); G01N 21/77 (2006.01); G01N 21/65 (2006.01)
CPC G01N 15/1434 (2013.01) [G01N 21/7746 (2013.01); G01N 2021/655 (2013.01); Y10S 977/88 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An add-drop filter for transmitting at least one optical signal, the add-drop filter comprising:
a first optical waveguide and a second optical waveguide, the first optical waveguide defining a through channel from an input port to an output port configured to carry the at least one optical signal; and
at least one active resonator coupled between the first and second optical waveguides, the at least one active resonator comprising a passive resonator and a gain medium, the gain medium configured to provide an optical gain to the at least one active resonator when the gain medium is excited by light received from a pump laser;
wherein the first and second optical waveguides and the at least one active resonator define:
an add channel configured to insert an add optical signal from an add port in the second optical waveguide through the at least one active resonator and into the at least one optical signal in the through channel; and
a drop channel configured to remove a drop optical signal from the at least one optical signal in the through channel through the active resonator and out a drop port of the second optical waveguide; and
wherein the at least one active resonator is configured by the gain medium and the power of the light received from the pump laser to provide an add efficiency of the add channel essentially equal to a drop efficiency of the drop channel.