Figure 3: Experimental setup. | Scientific Reports

Figure 3: Experimental setup.

From: Temporal and spatial multiplexed infrared single-photon counter based on high-speed avalanche photodiode

Figure 3

The pulsed laser at 1550 nm is operated with a repetition rate of 10 MHz. It is strongly attenuated to be used as QDT probe. The delay between the two paths in the fiber loop is adjusted to be 50 ns. The dual-channel single-photon detector based on InGaAs/InP APD is operated at 200 MHz, and the self-differencing technique is used to suppress the spike noise induced by the gating pulse. The outputs of the detector are recorded by the logic analyzer. The synchronization of the whole system is provided by the arbitrary function generator. A1: adjustable attenuator; A2: fixed attenuator; C1 and C2: 50/50 fiber beam-splitters.

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