为了实现可见光通信系统的探测器模块微小型化, 设计并制作了一款50 cm3的温控APD探测器模块, 并对模块的稳定性、温控效果和噪声特性进行了检测。结果表明, APD探测器模块的光电流测量平均相对偏差为0.795%; APD探测器的雪崩增益和响应度随着温度的降低而提高; APD探测器电阻的变化影响负载电阻分压, 使得过剩噪声因子的测量值远大于真实值, 且会随着入射光功率的增大而增大。可以得出结论: 提高反向偏置电压与降低温控温度相配合, 更有利于弱光信号检测; 检测电路中的负载电阻影响APD探测器噪声特性。

In order to realize the miniaturization of the detector module of visible light communication system, a 50 cm3 temperature-controlled avalanche photodiode (APD) detector module was designed and fabricated, and the stability, temperature control effect and noise characteristics of the module were tested. The results show that the average relative deviation of photocurrent measurement of APD detector module is 0.795%; the avalanche gain and responsivity of APD detector increase with the decrease of temperature; the change of the resistance of the APD detector affects the load resistor divider so that the measured value of the excess noise factor is much larger than the true value and increases as the incident light power increases. It can be concluded that increasing the reverse bias voltage in combination with lowering the temperature control temperature is more conducive to weak light signal detection;the load resistance in the detection circuit affects the noise characteristics of the APD detector.