| 一种模数混合的PGC解调方案 |
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| 引用本文： | 宫铭举,邓越,乔东海,邵敏,李国新,杨富强.一种模数混合的PGC解调方案[J].压电与声光,2008,30(5). |
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| 作者姓名： | 宫铭举 邓越 乔东海 邵敏 李国新 杨富强 |
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| 作者单位： | 1. 中国科学院,声学所声学微机电实验室,北京,100080;天津理工大学,电信学院,天津,300191
2. 中国科学院,声学所声学微机电实验室,北京,100080 |
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| 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(0~20 MHz),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。
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| 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 |
A Scheme of PGC Demodulation Based on Analog-digital Mixed System |
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| GONG Ming-ju,DENG Yue,QIAO Dong-hai,SHAO Min,LI Guo-xin,YANG Fu-qiang.A Scheme of PGC Demodulation Based on Analog-digital Mixed System[J].Piezoelectrics & Acoustooptics,2008,30(5). |
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| Authors: | GONG Ming-ju DENG Yue QIAO Dong-hai SHAO Min LI Guo-xin YANG Fu-qiang |
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| Abstract: | 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. |
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| Keywords: | PGC analog-digital mixed system sampling frequency carrier frequency parasitic amplitude modulation multi-quantum well laser |
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