Figure 3
Schematic layout of the experiment. EDFL erbium doped mode-locked fiber laser, YDFL ytterbium doped mode-locked fiber laser, ISO isolator for removing back-reflecting light, Pre-Amp amplifying system using erbium doped fiber, SHG second harmonic generation port using a PPLN crystal, DM1 dichroic mirror for separating signals (transmitted) and idlers (reflected), BPF band pass filter for cutting SPDC pump and extracting the corresponding signals, IRF infrared pass filter. Spectral Shape: Chirped fiber Bragg grating with 0.6-nm reflection band. Amp: Amplifying system using ytterbium-doped double-clad fiber and grating pairs for compensating its dispersion. DM2 Dichroic mirror for coupling the idlers and the UPC pump. SPF short pass filter for cutting the UPC pump, Si SPAD Si-based single photon counting avalanche photodiode, TCSPC Time correlated single photon counting module.
