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中文摘要：
通过实验证明了光外差法测量光探测器频率响应特性的一种校准方法的有效性。首先根据光外差法的基本原理详细推导了光探测器频率响应的表达式。发现了激光器调谐过程中的输出不稳定性是影响光外差法测量光探测器频率响应特性结果准确性的主要原因。激光器的输出不稳定性主要表现在输出光的偏振方向、光功率以及光谱不稳定造成的拍频信号线宽变化。实验对两个3dB带宽分别为10GHz和50GHz的探测器进行测量，逐一比较了采用与没有采用相应校准方法的结果，验证了该校准方法的有效性。
英文摘要：
A systematic calibration method to measure photodetector frequency response based on optical heterodyne technique is approved. The expression of photodetector frequency response is achieved by analyzing the fundamental principle of optical heterodyne. It is found that the main reason that influences the measurement results is the instable light of lasers during tuning. The instability includes variations in the lasers＇ polarization direction,power and the linewidth of the beat signal. Two photodetectors,of which 3 dB bandwidths are 10 GHz and 50 GHz,are measured. The errors caused by the instable light can be eliminated using the proposed calibration procedures. Experiments improve that the calibration method is feasible and effective.
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