介绍了利用边缘技术检测激光频率信号 ,实现大气激光通讯的原理。描述了利用碘分子滤波器作为边缘滤波器的原理性实验系统 ,并介绍和分析了实验结果。基于边缘技术的通讯系统拥有很窄的光学带宽和很高的激光频率稳定性 ,系统的光学信号带宽在 40 0MHz以内 ,并且接收系统仅对激光信号的频率敏感 ,可以剔除大气中绝大部分的干扰。对于原理实验的不足之处 ,文中进行了初步的探讨 Introduced the principle of using edge detection laser frequency signal to achieve atmospheric laser communication. The principle experiment system using iodine molecular filter as edge filter is described, and the experimental results are introduced and analyzed. The edge-based communication system has very narrow optical bandwidth and high laser frequency stability. The optical signal bandwidth of the system is within 40 MHz and the receiving system is only sensitive to the frequency of the laser signal, so that most of the atmospheric interference. For the lack of the principle experiment, the paper conducted a preliminary discussion