We propose and implement a source-sharing configuration based on fiber-optic gyroscopes for differential-mode and common-mode measurements. By adopting suitable values of the modulation parameters, the effect of relative intensity noise and thermal phase noise can be suppressed. Experimental results show that this configuration can achieve a maximum of 5.78 times self-noise suppression. We also show that the deviation of the modulation frequency from the eigenfrequency or its harmonics leads to an increase of the self-noise level. A deviation of 400 Hz can lead to a degradation of the self-noise level by up to 2.38 times. Finally, we prove the ability of suppression the environmental disturbance through an observation with the effect of natural vibrations.
We propose a structure based on fiber-optic gyroscopes for gravity measurement in accordance with the tilt-coupling effect, where Sagnac effect can remove the coupling between translational and rotational motion in the tilt-coupling effect. A fiber-optic gyroscope with a sensitivity of 2 × 10−11 rad/s2/√ HZ in sub-millihertz frequencies is reported, which can be utilized to measure the rotational motion in gravity measurement. The application of dual-polarization configuration improves the adaptability of exploration environment.
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