Fig. 1. Effect of MZM curve drift on pulse signal

Fig. 2. MZM bias control system in traditional links

Fig. 3. Relationship between MZM modulation curve and first and second harmonic components of dither

Fig. 4. Pulse modulation output signals of traditional MZM bias control system under different pulse repetition frequencies. (a) 2 kHz; (b) 10 kHz

Fig. 5. MZM bias control system based on DSP

Fig. 6. Effect of half-wave voltage of MZM on output optical power under the same bias voltage range

Fig. 7. Flow chart of MZM bias control based on dither adaptive

Fig. 8. Experimental setup of dither adaptive MZM bias voltage control. (a) MZM system construction; (b) scanning results of MZM half-wave voltage

Fig. 9. Output modulation signals corresponding to pulses with different repetition frequencies. (a) 1 kHz; (b) 2 kHz; (c) 10 kHz; (d) 21 kHz

Fig. 10. Output bias signals corresponding to pulses with different repetition frequencies. (a) 1 kHz; (b) 2 kHz; (c) 10 kHz; (d) 21 kHz

Fig. 11. Adaptive results of dither frequency when the electro-optic modulator bias voltage is stable. (a) 1 kHz; (b) 2 kHz; (c) 10 kHz; (d) 21 kHz