Frequency division multiplexing of fiber-optic gyroscopes

The principle of operation of a 2-D frequency-division-multiplexed fiber-optic gyroscope (FDM-FOG) system is presented under the assumption that the two gyro signals do not interfere with each other. The theory is expanded to include the residual cross-interference effect, which may be minimized by proper choice of modulation depths or frequencies. A 2-D FDM-FOG system is realized with a noise equivalent rotation rate of 0.23 degrees /h (0.25 Hz NEB).<
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