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《Acta Photonica Sinica》 2017-07
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Effect of L-C Combination Circuit on Electronic Noise of Shot Noise Photodetector

WANG Shao-feng;DONG Rui-fang;LIU Tao;ZHANG Shou-gang;Key Laboratory of Time and Frequency Primary Standards,National Time Service Center,Chinese Academy of Science;University of Chinese Academy of Sciences;  
By analyzing the electronic noise sources of shot noise photodetector based on the L-C coupled transimpedance amplifier circuit,the effect of the parasitic capacitance of the utilized inductance on the electronic noise was theoretically investigated and experimentally validated.The result shows that the parasitic capacitance of the inductor may increase the electronic noise of the detector via increasing the input voltage noise gain of the transimpedance amplifier.Given that the total inductance of the L-C circuit is 1 mH,the contribution to the electronic noise of choosing two series inductor with 0.5 mH each is much smaller than that of choosing a single inductor with 1mH.Furthermore,the higher the self resonant frequency of the inductor is,the smaller the parasitic capacitance and thus the smaller the electronic noise will be.The experiment results show that,at the analyzing frequency of 2.5 MHz,the electronic noise reduction of the two inductors in series with inductance of two 0.5 mH and resonance frequency of 6 MHz can reach up to 3dB,compared to that using a single 1 mH inductor with the resonance frequency of 1.6 MHz.Under a certain incident optical power,the signal-to-noise ratio of the detector can be thus improved effectively.
【Fund】: 国家自然科学基金(Nos.91336108 11273024 91636101 Y133ZK1101);; 中组部“青年拔尖人才”支持计划项目(No.中组字[2013]33号);; 中国科学院科研装备研制项目和中国科学院前沿科学重点研究项目(No.QYZDB-SSWSLH007)资助~~
【CateGory Index】: O431.2
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