中文摘要：

InGaAs/InP雪崩二极管（APD）可用于探测光通讯波段的单光子。APD工作于门模盖革模式时,单个光子引起的雪崩电流信号通常淹没在电容瞬时充放电脉冲中,光电流信号提取困难。本文通过调整实验参数和APD的寄生电容,使雪崩信号与放电脉冲在时域上有效叠加,并由高速比较器将光电流信号直接甄别出来。本文设计的基于InGaAs/InP APD的单光子探测系统,运行稳定,方法简单可靠,说明这种利用APD的电容特性提取单光子信号是一种有效的方法。

英文摘要：

InGaAs/InP avalanche photodiode（APD） working in gated Geiger mode can be used to measure single photons in the 1550 nm telecom-band.However,it is difficult to extract the photon induced avalanche current,which is usually buried in the charge and discharge pulses due to junction capacitance.When the avalanche signal and discharge pulse are properly overlaped in the time domain,the avalanche photocurrent is directly discriminated by high-speed comparator.The single photon detection system is simple and stable,which proves that it is efficient to extract the photon with this feature.