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根据光电二极管的等效电路图,基于自减方案的平衡零拍探测器的光电管(ETX500)产生的光电流的位相差异主要由等效电容引起,通过给两个光电管施加不同的偏置电来补偿等效电容的差异获得高共模抑制比的平衡零拍探测器,在探测器中安装任意两个ETX500,获得了63.8dB的高共模抑制比,并且当激光功率达到探测器的饱和功率54 mW时,激光光场的噪声谱在2 MHz处高于电子学噪声37dB,该探测器能很好地满足压缩态探测对低噪声、线性增益及高共模抑制比的要求。
According to the equivalent circuit diagram of the photodiode, the phase difference of the photocurrent generated by the phototube (ETX500) of the balanced zero-shot detector based on the self-descend scheme is mainly caused by the equivalent capacitance. By applying different bias voltages to the two phototransistors To compensate for differences in equivalent capacitance Balanced zero-shot detectors with a high common-mode rejection ratio, with any two ETX500s installed in the detector, achieving a high CMRR of 63.8dB, and when the laser power reaches the saturation of the detector When the power is 54 mW, the noise spectrum of the laser light field is 37 dB above the electronic noise at 2 MHz. The detector can meet the requirements of low noise, linear gain and high common mode rejection ratio of the compressed state detection well.