摘要
提出一种新的基于分布布拉格反射可调激光器的光外差频率响应测试系统,并给出了准确有效的校准方法来消除输出光功率和拍频线宽的波动等引起的误差,从而可以精确表征高速光探测器的频率响应特性.通过对标准高速光探测器的测试和校准,得到的结果与制造商提供的数据表相当符合,证明了该测试方法的准确性和有效性.文中也研究了系统中可能会影响频响特性测量的其他因素,如光源的边模抑制比、波长调谐速度等.
A novel optical heterodyne system with a distributed Bragg reflector （DBR） tunable laser is proposed,and an efficient calibration method is also put forward for removing errors caused by the fluctuations of optical power and the linewidth of the beat signal. Accurate frequency response of high-speed photodetectors can be obtained with this method. Results calibrated by our method agree well with data provided by the manufacturer, thereby demonstrating the accuracy and effectiveness of this method. Side-mode suppression ratios and dynamic behavior of wavelength transients, which probably affect the measurement of frequency response, are also investigated.
