摘要
分析了相位载波（PGC）技术的模拟数字混合解调方案，提出了一种改进的模拟数字混合系统。此系统可降低采样频率，消除寄生调幅的影响，同时克服了因载波漂移带来的解调困难。采用多量子阱激光器作为光源，使载波信号工作在较高的频率范围（0-20MHz），从而提高了系统带宽和动态范围。试验表明，通过该方案建立的系统满足解调要求。由于较低的采样频率，该方案适合时分复用的光纤传感器阵列。
An improved analog-digital mixed system is put forward on the bases of scheme of phase generated carrier（PGC）. This scheme can greatly reduce sampling frequency, eliminate the effect of the parasitic amplitude modulation and overcome the carrier frequency drift. At the same time, a multi-quantum well laser is used as laser LED, which makes the carrier frequency have a wide range（0-20 MHz）, and so enhances the frequency bandwidth and dynamical range of PGC demodulation. Experiment shows that it meets the demodulation requirement. Besides, because of its lower sampling frequency , this scheme can be well applied to the time division multiplexing optical sensor array.
出处
《压电与声光》
CSCD
北大核心
2008年第5期538-540,共3页
Piezoelectrics & Acoustooptics
关键词
相位载波
模拟数字混合系统
采样频率
载波频率
寄生调幅
多量子阱激光器
PGC
analog-digital mixed system
sampling frequency
carrier frequency
parasitic amplitude modulation
multi-quantum well laser
