基于相位偏移伺服系统的光电探测器频响测试方法研究

Research on Frequency Response Testing Method of Photodetector Based on Offset Phase Lock Servo System

本文主要介绍了基于相位偏移伺服系统的光电探测器频响测试方法,利用光外差法与反馈系统产生较为稳定的拍频信号,主要可以用于光电探测器频响指标测试。该系统采用光外差方法产生拍频信号,并将拍频信号输入相位伺服系统进行锁相,对从激光器进行微调从而达到稳频目的。将激光器在需求波段进行扫描,来得到光电探测器的频率响应曲线。

This paper mainly introduces the method of measuring the frequency response of photodetectors based on off phase lock servo system, which uses optical heterodyne and feedback system to produce more stable beat frequency signals that can be used to test the frequency response of photodetectors. The system uses optical heterodyne to produce beat frequency signal, which is input to off phase lock servo system to lock phase, so that the laser can be tuned to achieve the purpose of stabilizing. The frequency response curve of the photodetector is obtained by scanning the laser in the demand band.