Fig. 1. Schematic diagram of frequency modulated clock signal waveform inside acousto-optic modulator driver

Fig. 2. Schematic diagram of pulse chopper signal waveform input to acousto-optic modulator driver

Fig. 3. Schematic diagram of pulse modulated signal waveform output by acoustooptic modulator driver

Fig. 4. Pulse-modulated signal curves output from a conventional acousto-optic modulated driver

Fig. 5. Clock homologous (red) and clock nonhomologous (blue) ϕ-OTDR coherent detection system structure

Fig. 6. Pulse modulation signal curves of the acoust-optic modulation driver after clock homology control

Fig. 7. 0.1 Hz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both

Fig. 8. [in Chinese]

Fig. 8. 10 Hz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both

Fig. 9. 500 Hz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both

Fig. 10. 1 kHz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both