Fig. 1. SSPD used in the experiments. (a) Optical design. (b) Image taken by scanning electron microscope.

Fig. 2. Scheme of the coaxial optical system layout and laser-ranging experiments. The receiving optics are designed to meet the requirements of the allowed focus spot size and the allowed divergence angle of the incident light from the multi-mode fiber.

Fig. 3. Experimental setups. (a) Receiving optics, (b) the SSPD package, (c) the retroreflector, (d) the aluminum foil, (e) the solar panel, and (f) the concrete panel.

Fig. 4. Target range determination. (a) Starting and ending time from the waveform. (b) Target peak in statistical histogram. (c) Echo and noise distribution. (d) Polynomial fitting and 3σ iteration results.

Fig. 5. Experimental and theoretical SNR curves for (a) retroreflector and (b) aluminum foil and solar panel.