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对倍增型共振隧穿弱光探测器(RTDPD,resonant tunneling diode as photodetector)的噪声性能进行研究。设计了具有倍增区的RTDPD结构。对探测器电流-电压(I-V)特性的模拟发现,加入倍增区以后探测器的光电流和暗电流均被放大,其峰值电流增大了1.7倍。对RTDPD的噪声分布模拟发现,1/f噪声比散粒噪声和热噪声高出10个数量级左右。对倍增区的电场强度和过剩噪声因子进行了模拟,并计算了过剩噪声的功率谱密度。分析了倍增型RTDPD的总噪声,并对有、无倍增区时RTDPD的噪声等效功率进行了计算。结果显示,倍增区引入的噪声不仅不会影响探测器有效信号的提取,而且提高了探测器响应弱光的能力。
The noise performance of RTDPD (tunable tunneling diode as photodetector) was studied. The RTDPD structure with multiplication area is designed. Simulation of detector current-voltage (I-V) characteristics found that both the photocurrent and the dark current of the detector were amplified and the peak current increased by 1.7 times after adding the multiplier. The RTDPD noise distribution simulation shows that 1 / f noise is about 10 orders of magnitude higher than shot noise and thermal noise. The electric field intensity and excess noise factor in the multiplication zone are simulated and the power spectral density of excess noise is calculated. The total noise of multiplicative RTDPD is analyzed, and the noise equivalent power of RTDPD with and without multiplication is calculated. The results show that the noise introduced in the multiplication zone not only does not affect the extraction of the effective signal from the detector, but also improves the detector’s ability to respond to weak light.