基于高速微弱光电探测相关技术的浅析研究

Study of High Speed Weak Optical Photoelectric Detection Techniques

高速微弱光电探测技术在激光通信中应用广泛,如何在噪声环境中检测出所需信号是一个难点。首先对光电探测器主要部分(光电二极管与放大器)的参数进行分析,然后分析了光电二极管输出信噪比,得出提高光电探测灵敏度关键在于选择恰当的器件以及设计合理的放大电路。通过搭建具体的实验电路,经过测试,该电路在工作波长为1 550 nm脉冲信号,传输速率为2.5 Gb/s条件下,误码率为10-12时,探测器灵敏度可达到-24.8 dBm,实现了高速微弱信号的探测。

High speed weak optical detection technique is widely used in laser communication. It is difficult to detected desired signal in a noisy environment. The parameters of photodiode and amplifier and the signal to noise ratio were analyzed. The key to improve the photoelectric detection sensitivity is to choose the right components and design of reasonable amplifier circuit. By building specific experimental circuit, the operating wavelength of 1 550 nm pulse signal, the transmission rate of 2.5 Gb/s conditions. The photodetector sensitivity can reach -24. 8 dBm in the case of bit error rate of 10-12. It has realized the detection of high speed of weak signal.