基于OPA847和OPA657跨阻放大的平衡光电探测器  

Balanced Photodetectors Based on Transimpedance Amplifiers with OPA847 and OPA657

作　　者：王鼎康 武晋泽 宋志刚 李晋红[1] WANG Ding-kang;WU Jin-ze;SONG Zhi-gang;LI Jin-hong(Shanxi Center of Technology Innovation for Light Manipulations and Applications,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China;Laboratory of Solid-State Optoelectronics Information Technology,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China)

机构地区：[1]山西省光场调控与融合应用技术创新中心,太原科技大学应用科学学院,山西太原030024 [2]中国科学院固态光电信息技术重点实验室,中国科学院半导体研究所,北京100083

出　　处：《量子光学学报》2024年第4期108-118,共11页Journal of Quantum Optics

基　　金：国家重点研发计划(2021YFB2800304);国家自然科学基金(12004334)。

摘　　要：OPA847和OPA657是Texas Instruments公司生产的两款广泛用于研制平衡光电探测器的高速、低噪声运算放大器。本文研究了基于OPA847和OPA657跨阻放大平衡光电探测器的带宽和噪声特性。在理论上计算了探测器的-3 d B带宽和等效噪声功率(Noise Equivalent Power,NEP)对跨阻增益的依赖关系。OPA847在跨阻增益较小(带宽较大)时给出更小的NEP,而OPA657在跨阻增益较大(带宽较小)时给出更小的NEP。在实验上实现了跨阻增益分别为2 k V/A和200 k V/A的平衡光电探测器,并测量了探测器的频率和噪声性能。跨阻增益为2 k V/A时,OPA847和OPA657分别给出了220 MHz和130 MHz的-3 d B带宽以及8.2pw√Hz和22pw√Hz的NEP。跨阻增益为200 k V/A时,两者分别给出了9.2 MHz和8.5 MHz的-3 d B带宽以及4.3pw√Hz和2.3pw√Hz的NEP。这四种配置的探测器在-3 d B带宽范围内都实现了大于30 d B的共模抑制比。最后,测量了这些探测器在不同本振光功率下的噪声功率谱,在饱和功率范围内都实现了高于电子学噪声10 d B的散粒噪声测量。Objective Balanced photodetectors are a kind of high-sensitivity,low-noise photodetectors with two optical signal receivers,and the output signal is proportional to the difference between the two input optical powers.Owing to the differential detection technique,balanced photodetectors can effectively suppress common-mode noise,greatly improving the sensitivity and signal-to-noise ratio(SNR)of the optoelectronic system.Balanced photodetectors have been widely used in the fields such as laser coherent detection,coherent optical communication,and quantum optics.The performance parameters such as bandwidth,conversion gain,and noise equivalent power(NEP)of balanced photodetectors are mainly determined by the transimpedance amplifier(TIA).OPA847 and OPA657 produced by Texas Instruments are two high-speed,low-noise operational amplifiers that are suitable for implementing TIA and are widely used in commercial photodetectors and related research.Studying the performance of the TIAs based on OPA847 and OPA657 has important reference significance for designing different types of balanced photodetectors.Methods This paper theoretically and experimentally studies the bandwidth and noise characteristics of balanced photodetectors based on TIAs with OPA847 and OPA657.The dependence of the−3 dB bandwidth and the NEP of the balanced photodetectors on the transimpedance gain of TIA is theoretically calculated by using the equivalent circuit and noise model of photodiodes and TIA.The performance difference between the OPA847-and OPA657-based TIAs are compared.The contributions of the voltage and current noises of the operational amplifier and the thermal noise of the feedback resistor to the NEP are analyzed in detail.The balanced photodetectors based on OPA847 and OPA657 with transimpedance gains of 2 kV/A and 200 kV/A are experimentally performed,and their frequency and noise performances are measured.The−3 dB bandwidth is obtained from the frequency response and the NEP is obtained from the noise power spectrum.The measure

关 键 词：平衡光电探测器 跨阻放大器 OPA847 OPA657 

分 类 号：O431.2[机械工程—光学工程]