基于十倍光学拉伸的5GHz微波信号模数转换研究(英文)  

Demonstration of a 10-Fold Stretch-Factor Photonic Analog-to-Digital Converter For a 5GHz Radio-Frequency Signal

作　　者：彭迪[1] 张旨遥[1] 杨帆[1] 袁飞[1] 刘永[1] 

机构地区：[1]电子薄膜与集成器件国家重点实验室电子科技大学光电信息学院,成都610054

出　　处：《光子学报》2014年第7期107-111,共5页Acta Photonica Sinica

基　　金：The National Basic Research Program of China(No.2012CB315701,2012CB315702and 2011CB301705);the National Nature Science Foundation of China(No.60925019,61090393,61205109,61377037);the Science and Technology Innovation Team of Sichuan Province(No.2011JTD0001);the Fundamental Research Funds for the Central Universities(No.ZYGX2011J052)

摘　　要：利用光学时间拉伸法对微波信号进行降频处理,提高了后端电子模数转换器的有效模拟带宽和有效采样速率.设计了一套对5GHz微波信号十倍降频的光学时间拉伸模数转换系统.对色散导致的信号功率损耗特性以及调制引起的谐波失真进行了理论分析和数值仿真,结果表明:当系统带宽为5GHz时,光学时间拉伸引入的信号噪声失真比不会劣化后续电子模数转换器的有效位数,该模数转换系统的有效模带宽可达8GHz,有效采样率为200GS/s.A 10-fold stretch-factor photonic Time-Stretch Analog-to-Digital Converter （TS-ADC） system for a 5 GHz radio-frequency signal is achieved. By adopting the photonic time stretch scheme to compress the bandwidth of Radio-Frequency, the effective analog bandwidth and effective sampling rate of the posterior electronic Analog-to-D^gital Conversion were improved. The dispersion-induced power penalty of the stretched signal as well as the modulation-induced harmonic distortion were analyzed and simulated. The theoretical analysis and experimental results indicate that the Signal-to-Noise And Distortion ratio of the photonic time-stretch process is high enough to maintain the high effective number of bit of the posterior electronic Analog-to-Digital Conversers in the bandwidth of 0-5 GHz. In addition, the designed TS-ADC system can achieve an effective analog bandwidth of 8 GHz and an effective sampling rate of 200 GS/s.

关 键 词：模数转换器 光子学 色散 拉伸 谐波失真 

分 类 号：TN792[电子电信—电路与系统] TN29