Fig. 1. IFM structure diagram based on DP-MZM modulated AC/DC power detection

Fig. 2. Relationship curves of amplitudes of DC and AC of each order under different modulation coefficients m

Fig. 3. Theoretical curves. (a) AC/DC power and ACF curves; (b) relationship between time delay and ACF

Fig. 4. Comparison of theoretical and simulation curves. (a) AC/DC power and ACF curve; (b) relationship between time delay and ACF

Fig. 5. Comparison of theory and simulation curves. (a) Instantaneous frequency; (b) frequency measurement error

Fig. 6. System experimental setup

Fig. 7. Comparison of simulation and experimental results. (a) ACF; (b) frequency measurement error

Fig. 8. Effect of modulation coefficient on system performance. (a) Modulation coefficient varying with ACF; (b) modulation coefficient varying with frequency measurement error

Fig. 9. Predicted error curves of system and its simulation curves under different modulation coefficients

Fig. 10. Effect of upper sub-modulator bias voltage drift on system. (a) ACF varying with bias voltage drift; (b) bias voltage drift varying with frequency measurement error

Fig. 11. Effects of bias voltage drifts of two sub-modulators on system. (a) ACF varying with bias voltage drift; (b) frequency measurement error varying with bias voltage drift

Fig. 12. Effect of main arm bias voltage drift on system performance. (a) ACF varying with bias voltage drift; (b) frequency measurement error varying with bias voltage drift

Fig. 13. Effect of extinction ratio on system performance. (a) Relationship between extinction ratio and ACF; (b) relationship between extinction ratio and frequency measurement error