Fig. 1. Design schematic of homodyne detection experiment

Fig. 2. Experimental optical path of homodyne detection

Fig. 3. Design schematic of balanced detection experiment

Fig. 4. Experimental optical path of balanced detection

Fig. 5. Rotational velocity spectrum of homodyne detection

Fig. 6. Rotational velocity spectrum of balanced detection

Fig. 7. Relative error changes with rotational velocity

Fig. 8. Analysis of SNR