Fig. 1. Basic structure of cascaded RF amplification balanced homodyne detector circuit

Fig. 2. Circuit equivalent model of photodiodes

Fig. 3. Equivalent model of BHD AC amplification circuit

Fig. 4. Two-port equivalent model and simulation link diagram of AC amplification circuit

Fig. 5. S parameters simulation results of the AC amplification circuit

Fig. 6. Stability simulation result of the AC amplification circuit

Fig. 7. Sensitivity analysis results of AC amplification circuit

Fig. 8. Optimized simulation results of AC amplification circuit

Fig. 9. Schematic diagram of balanced homodyne detector

Fig. 10. Performance test device diagram of balanced homodyne detector

Fig. 11. Performance test results of balanced homodyne detector. (a) Detection bandwidth and signal-to-noise ratio; (b) variation curve of noise power with incident light power

Fig. 12. Common mode rejection ratio test results

Fig. 13. Collaborative simulation result diagram of AC amplification circuit. (a) Stability simulation results; (b) reflection coefficient of the access port of photodiodes PD1 and PD2