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 feedback servo generating a sinusoidal feedback signal to the intensity modulator;
wherein the feedback servo adjusts an amplitude of the sinusoidal feedback signal provided to intensity modulator based on a residual intensity modulation detected by the 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 is provided. The controller includes an intensity modulator optically coupled to receive a light beam from a laser source modulated at a resonance detection modulation frequency, and an optical tap device optically coupled to the intensity modulator. The controller also includes 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
13 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 feedback servo generating a sinusoidal feedback signal to the intensity modulator; wherein the feedback servo adjusts an amplitude of the sinusoidal feedback signal provided to intensity modulator based on a residual intensity modulation detected by the feedback servo. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling intensity modulation in a resonating fiber optic gyroscope (RFOG), the method comprising:
detecting residual intensity modulation of a light beam from a laser source; producing a sinusoidal feedback control signal based on the residual intensity modulation; and driving an intensity modulator with the sinusoidal feedback control signal, wherein producing the sinusoidal feedback control signal comprises adjusting an amplitude of the sinusoidal feedback signal based on the residual intensity modulation. - View Dependent Claims (9, 10, 11, 12, 13)
Specification