构建了一套基于高速伪随机码调制和光子计数技术的激光测距实验系统,系统采用10阶M序列伪随机码调制1550 nm光纤激光器和具有3级热电制冷能力的InGaAs/InP单光子探测器。利用光纤延时方法进行了测距性能验证实验，在激光器调制速率为622 MHz，伪随机码序列长度1.64 μs和探测器探测效率10%时，当入射到探测器的信号光的平均功率为-76.1 dBm时，得到22.6 dB的系统信噪比和0.95 cm的测距精度，为实际系统验证提供了技术参考。

A laser ranging system based on high speed pseudorandom modulation and photon counting technology is developed. 1550 nm fiber laser modulated by 10 order M sequence pseudorandom code and InGaAs/InP single photon detector with three-stage thermo-electric cooler are implemented in the system. The ranging performance is demonstrated using the optical fiber delay method indoor. Under condition of the laser modulation frequency of 622 MHz, the pseudorandom sequence length of 1.64 μs and the detection efficiency of 10%, the signal-to-noise ratio of 22.6 dB and ranging accuracy of 0.95 cm are obtained with -76.1 dBm input signal average power. This demonstration is useful for developing practiced system.