US 12,392,612 B2
Systems and methods for effective relative intensity noise subtraction for a broadband resonator optical gyroscope
Tiequn Qiu, Glendale, AZ (US); Jianfeng Wu, Tucson, AZ (US); Glen A. Sanders, Scottsdale, AZ (US); Matthew Wade Puckett, Phoenix, AZ (US); and Steven Tin, Edina, MN (US)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Oct. 2, 2023, as Appl. No. 18/479,505.
Prior Publication US 2025/0109941 A1, Apr. 3, 2025
Int. Cl. G01C 19/72 (2006.01); G02B 6/293 (2006.01); H01S 3/067 (2006.01)
CPC G01C 19/727 (2013.01) [G01C 19/721 (2013.01); H01S 3/06791 (2013.01); H01S 3/06795 (2013.01); G02B 6/2934 (2013.01); G02B 6/29347 (2013.01); H01S 2301/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A resonator optical gyroscope, comprising:
a broadband light source configured to generate optical signals having a broadband frequency range;
an optical resonator;
a first optical coupler configured to receive the optical signals from the broadband light source and couple the optical signals into the optical resonator such that the optical signals propagate in a first direction through the optical resonator;
a second optical coupler coupled to the optical resonator, wherein the second optical coupler is configured to couple optical signals out of the optical resonator after the optical signals pass through the optical resonator in the first direction;
a phase modulator configured to apply a phase modulation to optical signals that have been coupled out of the optical resonator by the second optical coupler to generate phase-modulated optical signals;
an optical filter configured to filter a first portion of the phase-modulated optical signals to generate filtered, phase-modulated optical signals;
wherein the second optical coupler is configured to couple a second portion of the phase-modulated optical signals into the optical resonator such that the phase-modulated optical signals propagate in a second direction through the optical resonator, wherein the first optical coupler is configured to couple the second portion of the phase-modulated optical signals out of the optical resonator after the phase-modulated optical signals pass through the optical resonator in the second direction;
a relative intensity noise detector configured to convert the filtered, phase-modulated optical signals to first electrical signals indicative of a power level of the filtered, phase-modulated optical signals and relative intensity noise;
a second photodetector configured to convert the phase-modulated optical signals to second electrical signals indicative of a power level of the phase-modulated optical signals after passing through the optical resonator in the second direction; and
one or more circuits configured to determine a rate of rotation based on the first electrical signals and the second electrical signals.