论文部分内容阅读
介绍了一种利用光外差技术测量光电探测器超宽带频率响应的测试方法。将一个可调谐外腔激光器和一个固定波长的分布反馈激光器(DFB-LD′s)产生的激光输入到光电探测器进行混频。通过对可调激光器腔长的控制,可以在光电探测器产生从DC到上百GHz的拍频信号,在无需额外校准光源的情况下就可以进行光电探测器超宽带频率响应特性的测试,这是该方法最突出的优点。实验证明该方法比较准确、简便、易于操作。在实验中,对两个不同的InGaAs p-i-n探测器进行测量,得到器件的3 dB带宽分别为14.4 GHz和40 GHz。该测量方法对同类实验的研究和应用都具有实用意义。
A test method for measuring ultra-wideband frequency response of photodetector using optical heterodyne technique is introduced. A tunable external cavity laser and a fixed-wavelength distributed feedback laser (DFB-LD’s) generate laser light that is input to the photodetector for mixing. Through the control of tunable laser cavity length, the beat signal from DC to hundreds of GHz can be generated in the photodetector, and the ultra-wideband frequency response characteristics of the photodetector can be tested without additional calibration of the light source, which This method is the most prominent advantages. Experiments show that the method is more accurate, simple and easy to operate. In the experiment, two different InGaAs p-i-n detectors were measured and the resulting 3 dB bandwidth was 14.4 GHz and 40 GHz, respectively. This measurement method is of practical significance for the research and application of similar experiments.