Resonator fiber optic gyroscope without frequency overlap in sideband-heterodyne-detection modulations
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United States of America Patent
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Sep 1, 2015
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app pub date -
May 8, 2014
filing date -
May 8, 2014
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Abstract
A resonator fiber optic gyroscope (RFOG) is provided. The RFOG includes a fiber coil, first and second lasers, first and second phase modulators, and a common phase modulator. The first laser generates CW input light for propagation in the CW direction of the fiber coil. The second laser generates CCW input light for propagation in the CCW direction of the fiber coil. The first phase modulator modulates the CW input light with modulation frequency f1=(n+0.5)*FSR. The second phase modulator modulates the CCW input light with modulation frequency f2=(m+0.5)*FSR so that overlap of major sidebands is avoided. The phase modulation amplitudes of the first and second modulators substantially suppress the optical carrier components of the CW and CCW input light. The common phase modulator is configured to modulate the CW and CCW input light with a common phase modulation frequency and a common phase amplitude.
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