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设计并实现了一种结构简单的全光纤1.55μm相干多普勒激光雷达系统。该系统以窄线宽高功率的分布反馈式光纤激光器为光源,偏振无关的光纤环行器为光开关,由光纤准直器和透镜组成收发合一的天线。利用 PIN 光电二极管为光电探测器,对取得的外差电信号进行快速傅里叶变换后,得到了带有固体目标纵向运动速度信息的多普勒频谱信号,改变目标的运动速度,明显观察到多普勒频谱信号频率也随之改变。
A simple all-fiber 1.55μm coherent Doppler lidar system is designed and implemented. The system uses a narrow-bandwidth, high-power distributed feedback fiber laser as a light source, and a polarization-independent optical fiber circulator as an optical switch. The optical fiber collimator and the lens form a transmitting / receiving antenna. Using PIN photodiode as photodetector, the obtained heterodyne signal is subjected to fast Fourier transform to obtain the Doppler spectrum signal with the information about the longitudinal movement speed of the solid target. It is obvious that the moving speed of the target is obviously changed Doppler spectrum signal frequency also changes.