Improving the Performance of Broadband Source-Driven Resonant Fiber-Optic Gyroscopes

The broadband source-driven resonant fiber-optic gyroscope (RFOG), as a new type of gyroscope, demonstrates impressive advantages in both detection sensitivity and long-term bias stability. To further improve the system performance, this paper investigates the factors affecting the detection sensitivity and long-term bias stability of the broadband source-driven RFOG. Two mathematical models are developed to analyze the relationship between the fiber-optic ring resonator (FRR) parameters and the detection sensitivity, as well as the error induced by imperfect modulation signals. The analysis shows that the detection sensitivity can be improved by optimizing the coupling coefficients of the FRR. Meanwhile, the bias error at the output of the gyroscope caused by imperfect modulation can be effectively suppressed by improving the harmonic suppression ratio of the modulation signal and compensating the phase difference between the first and second harmonics. Finally, after using the optimized FRR and suppressing the error due to imperfect modulation, the experimental results show that the bias stability is in the range of 1°/h to 450 μ°/h for different cavity lengths.