Fig. 1. Simulation results of the relationship between the powers of two output optical signals after demultiplexing under different working points.

Fig. 2. Experimental setup of a high-stability channel-interleaved PADC system with a feedback link. AMLL, actively mode-locked laser; AMP, optical amplifier; MZM, Mach–Zehnder modulator; TDL, time delay line; PD, photodiode; ADC, analog-to-digital converter; OC, optical coupler; BPD, balanced photodiode; DSP, digital signal processor; PPS, programmable power supply.

Fig. 3. Experimental results of the relationship between demultiplexing performance and driving voltage in the PADC system when the frequency of the input signal to be sampled is (a) 2.4 GHz and (b) 12.4 GHz.

Fig. 4. Experimental results of the relationship between the feedback signal and transmission function of the photonic switch (MZM2).

Fig. 5. (a) Measured result of the amplitude mismatch between channels after demultiplexing in a channel-interleaved PADC system without a feedback link. (b) Measured result of the amplitude mismatch between channels after demultiplexing in a channel-interleaved PADC system with the feedback optimization.