宽带光电探测器的仿真分析与实验研究  

Simulation and Analysis of the Wideband Photodetector with Transimpedance Operational Amplifier

作　　者：刘惠 张卓 凌志强 刘建丽 LIU Hui;ZHANG Zhuo;LING Zhi-qiang;LIU Jian-li(School of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《量子光学学报》2023年第1期42-49,共8页Journal of Quantum Optics

基　　金：国家自然科学基金(11504217)。

摘　　要：宽带光电探测器广泛应用于量子光学和快速量子信息处理实验系统中。本文介绍了一种基于跨阻放大电路的宽带光电探测器,详细分析了光电探测器的等效噪声模型,理论上给出了光电探测器的电子学噪声和信号噪声输出特性;作为比对分析,同步建立了探测器的PSpice软件仿真模型,分析了运算放大器的电压噪声、电流噪声以及寄生电容等参数对光电探测器性能的影响。在理论和仿真分析的基础上,利用增益带宽积为3.9 GHz的低噪声运算放大器OPA847研制了宽带光电探测器,光电探测器在分析频率100 MHz内的噪声功率谱线比较平坦,-3 dB带宽约为110 MHz。Broadband photodetectors play a significant role in quantum optics and quantum information processing including the detection of squeezed pulses,quantum state reconstruction,and continuous-variable quantum key distribution system.By the noise analysis model of the photodetector based on transimpedance amplifier circuit,the electronic noise and signal noise characteristics are theoretically analyzed.And based on the PSpice simulation model,the effects of the main parameters on the performance of the photodetector are analyzed in detail.The input voltage noise of the operational amplifier is the main noise source of electronic noise,and the current noise of the operational amplifier affects the magnitude of the low-frequency noise.The input parasite capacitances play a non-negligible influence on the noise power spectrum.With the increase of the input parasitic capacitance,the electronic noise increases and the signal-to-noise ratio decreases.Through the comparisons between the theoretical calculation and the simulation results,these two analysis methods are equivalent.A wideband photodetector is developed by using a low-noise operational amplifier of OPA847.The experimental noise power spectrum is in good agreement with the simulation results,and the-3dBbandwidth of thephotodetector is 110MHz.

关 键 词：宽带 光电探测器 寄生电容 电压噪声 电流噪声 

分 类 号：O431.2[机械工程—光学工程]