基于噪声平衡抑制的近红外单光子高速探测方法

Spike-noise balanced technique for high-speed detection of near-infrared single photons

针对现有基于尖峰噪声电容平衡方法的单光子探测技术工作频率较低的问题,设计了利用高速二极管平衡的InGaAs/InP雪崩光电二极管信号提取方案.配合高速信号处理电路,实现了工作频率最高达700 MHz的近红外单光子探测器.雪崩二极管制冷至218 K,在脉宽小于1 ns、重复频率700 MHz的门脉冲触发下,当探测效率为10%时,暗计数率为7×10^(-6)/pulse,后脉冲率为7.4%.该方案提供了一种重复频率连续可调宽带高速单光子探测方法,结构简单且性能良好.

An efficient single-photon detector was realized using high-speed diode to eliminate the spike of In GaAs/InP avalanche photodiode（ APD）. The repetition rate of the single-photon detector reached up to 700 MHz. With the APD operating at the temperature of 218 K and the detection efficiency of10%,we demonstrated that the typical dark-count and after-pulse probability was 7 × 10^-6/ pulse and7. 4%,respectively. This scheme provides a simple and robust method to realize high-speed singlephoton detection.