SYSTEMS AND METHODS FOR RESONATOR FIBER OPTIC GYROSCOPE INTENSITY MODULATION CONTROL
First Claim
1. A resonant fiber optic gyroscope (RFOG) having a residual intensity modulation (RIM) controller, the controller comprising:
- an intensity modulator optically coupled to receive a light beam from a laser source modulated at a resonance detection modulation frequency;
an optical tap device optically coupled to the intensity modulator; and
a feedback servo coupled to the optical tap device and the intensity modulator, the demodulating feedback servo generating a sinusoidal feedback signal to the intensity modulator;
wherein the feedback servo adjusts an amplitude and phase of the sinusoidal feedback signal provided to intensity modulator based on a residual intensity modulation detected by the demodulating feedback servo.
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Abstract
Systems and methods for improved resonator fiber optic gyroscope intensity modulation control are provided. In one embodiment, a resonant fiber optic gyroscope (RFOG) having a residual intensity modulation (RIM) controller comprises: an intensity modulator optically coupled to receive a light beam from a laser source modulated at a resonance detection modulation frequency; an optical tap device optically coupled to the intensity modulator; and a feedback servo coupled to the optical tap device and the intensity modulator, the demodulating feedback servo generating a sinusoidal feedback signal to the intensity modulator. The feedback servo adjusts an amplitude and phase of the sinusoidal feedback signal provided to intensity modulator based on a residual intensity modulation detected by the demodulating feedback servo.
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Citations
20 Claims
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1. A resonant fiber optic gyroscope (RFOG) having a residual intensity modulation (RIM) controller, the controller comprising:
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an intensity modulator optically coupled to receive a light beam from a laser source modulated at a resonance detection modulation frequency; an optical tap device optically coupled to the intensity modulator; and a feedback servo coupled to the optical tap device and the intensity modulator, the demodulating feedback servo generating a sinusoidal feedback signal to the intensity modulator; wherein the feedback servo adjusts an amplitude and phase of the sinusoidal feedback signal provided to intensity modulator based on a residual intensity modulation detected by the demodulating feedback servo. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A residual intensity modulation (RIM) servo device for a resonant fiber optic gyroscope (RFOG), the device comprising:
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a first control loop comprising an in-phase demodulator that receives digital data samples of a light beam, the first control loop generating a first error signal that is a function of an in-phase component of residual intensity modulation in the light beam; a second control loop comprising a quadrature-phase demodulator that receives the digital data samples of the light beam, the second control loop generating a second error signal that is a function of a quadrature-phase component of residual intensity modulation in the light beam; an amplifier coupled to the first control loop and the second control loop, the amplifier generating a sinusoidal feedback signal that drives an intensity modulator that modulates the light beam, wherein the amplitude and phase of the sinusoidal feedback signal are controlled with the first error signal and the second error signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for controlling intensity modulation in a resonating fiber optic gyroscope (RFOG), the method comprising:
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generating in-phase intensity modulation error signal by demodulating digital samples of a light beam using a first sinusoidal reference generated at a resonance detection modulation frequency; generating quadrature-phase intensity modulation error signal by demodulating digital samples of the light beam using a second sinusoidal reference generated at the resonance detection modulation frequency, wherein the second sinusoidal reference is out- of-phase from the first sinusoidal reference by 90 degrees; producing a sinusoidal feedback control signal from the in-phase intensity modulation error signal and the quadrature-phase intensity modulation error signal; and driving an intensity modulator with the sinusoidal feedback control signal, wherein the intensity modulator cancels residual intensity modulation from the light beam. - View Dependent Claims (17, 18, 19, 20)
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Specification