提出了用来探测大气CO2 分布、基于光纤 1.6um波长的微脉冲激光雷达 ,对其性能进行了数值模拟 .微脉冲激光雷达的发射机以半导体激光器加光纤放大器为核心 ,饱和输出功率 37dBm ;接收机采用了近红外光电倍增管和光子计数器 ,量子效率 1% ;一种偏正无关性纤维光学环形器作为发射 /接收转换器 ,分波 /合波器、隔离器、滤波器、耦合器都采用光纤器件 ,使系统更牢固 .该系统的特点是发射脉冲能量低 2 0uJ、重复频率高 2 0KHz、小型化 .(18× 10 6个脉冲累加 )它对近地面 4 .7Km高度内的探测信噪比在 10∶1以上 .光电倍增管的暗计数 2× 10 5/s限制了系统探测距离的增加 .吸收倍增分离的InGaAs/Si雪崩光电二极管将会改善雷达的性能 . The performance of the pulsed laser radar with 1.6um wavelength based on optical fiber is put forward to simulate the atmospheric CO2 distribution.Micropulse Lidar transmitter uses semiconductor laser and optical fiber amplifier as the core and has a saturation output power of 37dBm. The machine uses a near-infrared photomultiplier tube and a photon counter with a quantum efficiency of 1%; a biased positive fiber optic circulator as a transmit / receive converter, a splitter / combiner, an isolator, a filter, and a coupler The use of fiber optic devices to make the system more solid.The system is characterized by the launch pulse energy low 20uJ, high repetition rate 2 0KHz, miniaturization (18 × 10 6 pulse accumulation) It is near the ground within 4 .7Km detection The signal-to-noise ratio is above 10: 1. The dark count of the photomultiplier tube, which limits the system’s detection range by 2 × 10 5 / s, will improve the performance of the radar by absorbing the multiplied separated InGaAs / Si avalanche photodiodes.