摘要
在大气激光通信系统中,雪崩光电二极管(APD)常作为接收机实现微弱光信号的检测。首先简述了APD探测器的工作原理,其次仿真分析了影响APD探测灵敏度的因素,最后对APD探测器的动态范围进行了计算。仿真结果表明:存在一个最佳倍增因子,在给定光功率下使APD探测器获得最大信噪比;温度对探测灵敏度的影响可通过最佳偏置电压温度补偿的方法,使APD探测器在-20℃～70℃范围内保持倍增因子的恒定;根据APD探测器的动态范围合理选择通信光功率,防止探测器检测不到光信号,造成通信链路的中断。
An avalanche photodiode （APD） is often used as receiver to detect weak optical signals in atmo- spheric laser communication system. Firstly, the work principle of the APD detector was described,then the factors influencing the sensitivity of APD are simulated and analyzed. Finally, the calculation have been car- ded out to the dynamic range of APD detector. Simulation results show that there is a best multiplication fac- tor that gives the APD detector maximum signal-to-noise ratio at a given optical power. The effect of temper- ature on the detection sensitivity can be achieved by the best bias voltage temperature compensation method to achieve APD detector keeps the multiplication factor constant from -20℃-70 ℃, According to the dynamic range of APD reasonable choice of communication optical power to prevent the detector can not detect the communication light that resulting in communication link interruption.
作者
钱能
QIAN Neng(Zhejiang post and telecommunication college, Shaoxing Zhejiang 312016, China)
出处
《光通信技术》
北大核心
2018年第7期51-54,共4页
Optical Communication Technology
基金
2017年度高校访问工程师"校企合作项目"(FG2017216)资助
关键词
雪崩光电二板管
探测灵敏度
偏压补偿
信噪比
avalanche photodiode
detection sensitivity
bias compensation
signal-to-noise ratio
