APD的混频性能受自身散热的影响

APD Mixing Performance is Influenced of by Its Heat Dissipation

雪崩光电二极管(APD)在调频连续波激光雷达接收机中既能实现探测又能完成混频.为了研究APD在光电混频过程中是否受自身温度的影响,依据混频性能定义和已知的APD增益模型建立了混频性能模型,包括混频效率模型和混频信噪比模型.基于APD增益模型和混频性能模型,采用实验研究的方法,探究了APD混频性能受自身散热的影响.实验结果和理论分析一致表明,APD自身散热越差,即APD自身温度越高,其增益越小且混频性能越差,混频效率和混频信噪比都随着APD自身温度的升高而减小.

Avalanche photodiode （APD） can be used as frequency modulation continuous wave （FMCW） ra- dar laser photoelectric detector and can also realize the photoelectric mixing function. In order to study whether APD is influenced by its temperature in the progress of photoelectric mixing, mixing models are constructed accord- ing to the definition of mixing performance and known gain model, including mixing efficiency model and mixing SNR model. Based on APD gain model and mixing performance models, experience research is adopted to explore that mixing performance of APD is influenced by its temperature. The experimental results and theoretical analysis show that the worse is the heat dissipation of APD itself, namely the higher is the temperature, the gain is smaller and the poorer is its mixing performance, the mixing efficiency and mixing signal-to-noise ratio decrease with the rising of temperature of APD.