Fig. 1. Structural diagram of RFOG system

Fig. 2. Change of resonant signal in frequency sweep process

Fig. 3. Corresponding relation between output optical power and driving current of laser

Fig. 4. Out-of-lock frequency-tracking control scheme of RFOG based on temperature closed-loop feedback

Fig. 5. Division of FPGA digital working region in out-of-lock control scheme

Fig. 6. Photograph of RFOG prototype

Fig. 7. Temperature drift of resonator affected by environment

Fig. 8. Output comparison of RFOG at room temperature. (a) Before out-of-lock control; (b) after out-of-lock control

Fig. 9. Performance test of RFOG at room temperature. (a) Photograph of testing; (b) result of 1-h static test