Fig. 1. Schematics of WRR structures. (a) Transmissive; (b) reflective

Fig. 2. Schematic diagram of multiple propagation of light waves around cavity

Fig. 3. Relationship among resonator power multiplication factor and F/π and resonator parameters. (a) M_R in reflective WRR; (b) M_T in transmissive WRR; (c) F/π in reflective WRR; (d) F/π in transmissive WRR

Fig. 4. Photo of transmissive silica WRR chip

Fig. 5. Resonant curve test system

Fig. 6. Test results of resonant curves of three transmissive silica WRRs. (a) WRR with diameter of 4.20 cm; (b) WRR with diameter of 5.95 cm; (c) WRR with diameter of 5.96 cm

Fig. 7. Relationship between optical Kerr effect-induced error coefficient and modulation frequency of CW optical path

Fig. 8. Block diagram of single-loop RMOG system for testing optical Kerr effect-induced error in WRR

Fig. 9. Measured results of optical Kerr effect-induced errors in RMOG with three different WRRs as core sensitive units. （a） D=4.20 cm， f₁=2.0 MHz， f₂=2.1 MHz； （b） D=4.20 cm， f₁=2.0 MHz， f₂=2.5 MHz； （c） D=5.95 cm， f₁=2.0 MHz， f₂=2.1 MHz； （d） D=5.95 cm， f₁=2.3 MHz， f₂=2.5 MHz； （e） D=5.96 cm， f₁=2.0 MHz， f₂=2.1 MHz； （f） D=5.96 cm， f₁=2.6 MHz， f₂=2.7 MHz

Fig. 10. RMOG system containing laser power feedback loop

Fig. 11. Relationship between output voltage of second harmonic demodulation and input power of CCW beam

Fig. 12. Test results of input optical power fluctuations before and after laser power feedback