US 12,460,931 B2
Mitigating bias instabilities in optical gyroscopes
Nathan Abrams, Santa Clara, CA (US); Mario Paniccia, Santa Clara, CA (US); and Mike Horton, Santa Clara, CA (US)
Assigned to Anello Photonics, Inc., Santa Clara, CA (US)
Filed by Anello Photonics, Inc., Santa Clara, CA (US)
Filed on Sep. 13, 2024, as Appl. No. 18/885,420.
Application 18/885,420 is a continuation of application No. 18/626,209, filed on Apr. 3, 2024, granted, now 12,123,718.
Claims priority of provisional application 63/495,513, filed on Apr. 11, 2023.
Prior Publication US 2025/0003751 A1, Jan. 2, 2025
Int. Cl. G01C 19/72 (2006.01); G01C 19/10 (2006.01); G01C 19/64 (2006.01); G01C 19/66 (2006.01)
CPC G01C 19/661 (2013.01) [G01C 19/10 (2013.01); G01C 19/64 (2013.01); G01C 19/72 (2013.01); G01C 19/725 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical gyroscope comprising:
a first photodetector to measure a first signal associated with a first beam in isolation;
a second photodetector to measure a second signal associated with a second beam in isolation, wherein the first beam and the second beam are counter-propagating with respect to each other;
a third photodetector to measure a rotation signal associated with an interferometric combination of the first beam and the second beam;
one or more control integrated circuits (ICs) to remove one or more bias instabilities from the rotation signal using the first signal and the second signal, wherein the one or more control IC generates a secondary modulation frequency that introduces a secondary bias with minimal sensitivity to rotation; and
a waveguide coil with a plurality of turns acting as a rotation sensing element.