紫外调制光产生及检测技术

针对紫外光通信接收端机无法校准的问题,为了验证其抑制背景杂散光的能力,定义了"背景光抑制比"作为衡量接收机抑制背景光能力的定量参数,设计并实现了一种基于紫外激光器外调制的标准紫外调制光源,并利用探测器和锁相放大器对调制光源信号进行了检测。实验结果表明,锁相放大器能够有效抑制噪声,准确测量标准紫外调制光信号的功率,保证了"背景光抑制比"的量值准确可靠。

For the UV communication receiver cannot be calibrated, this paper defines ‘background light rejection ratio’as measure of the receiver to suppress background light in order to verify receiver’s ability to suppress the background of stray light. Design and implement a UV modulation signal based on UV laser and acoustic-optical modulator. The modulation signal was detected by Si detector and lock-in amplifier. The experimental results show that, the lock-in amplifier can effectively suppress the noise and measure the pow-er of modulation signal accurately. So the traceability of‘background light rejection ratio’can be guaranteed.