Secondly, in light signal reception unit, low noise avalanche diode, due to its high responsivity to special wavelength, acts as optical receiver, extracting useful signal with the combination of high bandwidth amplifier and high speed comparator; 其次,在光信号接收方面,使用对特殊波长响应度极高的低噪声的雪崩二极管作为接收器件,利用高带宽信号放大芯片对信号进行放大,并结合高速比较器来提取有用信号;