Fig. 1. Schematics of preamplifier-free high-speed hybrid quenching circuit

Fig. 2. Structure of integrated low noise InGaAs near-infrared single-photon detector based on NFAD. (a) Section view of the detector; (b) Heat dissipation structure of the detector (The red dashed circle indicates the position which is attached to the anti-interference shielding material, the blue area indicates the contact of NFAD housing and the heat sink)

Fig. 3. Waveforms at the non-inverting (solid) and inverting (dashed) inputs of the comparator

Fig. 4. Detection efficiency (P_de) as a function of excess bias

Fig. 5. Dark count rate as a function of dead time at different detection efficiencies

Fig. 6. Total afterpulse probability as a function of dead time at different detection efficiencies

Fig. 7. Total afterpulse probability versus dead time at different detection efficiencies