Temperature drift suppression by symmetric extended square-wave modulation in interferometric fiber-optic gyroscopes for precision measurement applications

Temperature variations cause drifts in modulation depth, degrading the stability of interferometric fiber-optic gyroscopes. A symmetric extended square-wave modulation method with real-time feedback is proposed to suppress this effect. Compared with the conventional modulation method, experimental validation under varying thermal conditions demonstrates a 29.7-fold reduction in the deviation of modulation depth, a 2.1-fold improvement in bias instability, and a twofold extension in minimum stable time, confirming that the proposed method can suppress the effect of temperature variations on the stability of interferometric fiber-optic gyroscopes.