Fig. 1. Experimental setup of electro-optic sampling

Fig. 2. Variation of transmission coefficient S21 with frequency

Fig. 3. Time domain pulse waveform of 70 GHz photodetector

Fig. 4. Time domain pulse waveforms with time constants of lock-in amplifier of 1 s, 3 s and 10 s, respectively

Fig. 5. Time domain pulse waveforms with chopper frequency of 0.5 kHz, 1 kHz and 1.5 kHz, respectively

Fig. 6. Time domain pulse waveforms with sampling optical power attenuated of 1%, 10% and 50%, respectively

Fig. 7. Time domain pulse waveforms with different excitation powers

Fig. 8. Optimized time domain pulse waveform of 70 GHz photodetector