光子学报, 2014, 43 (7): 0706015, 网络出版: 2014-08-18
基于十倍光学拉伸的5GHz微波信号模数转换研究
Demonstration of a 10Fold StretchFactor Photonic AnalogtoDigital Converter For a 5 GHz RadioFrequency Signal
模数转换器 光子学 色散 拉伸 谐波失真 AnalogtoDigital Conversion Photonics Dispertion Stretching Harmonic distortion
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5 GHz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5 GHz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8 GHz,有效采样率为200 GS/s.
Abstract
A 10fold stretchfactor photonic TimeStretch AnalogtoDigital Converter (TSADC) system for a 5 GHz radiofrequency signal is achieved.By adopting the photonic time stretch scheme to compress the bandwidth of RadioFrequency,the effective analog bandwidth and effective sampling rate of the posterior electronic AnalogtoDigital Conversion were improved.The dispersioninduced power penalty of the stretched signal as well as the modulationinduced harmonic distortion were analyzed and simulated.The theoretical analysis and experimental results indicate that the SignaltoNoise And Distortion ratio of the photonic timestretch process is high enough to maintain the high effective number of bit of the posterior electronic AnalogtoDigital Conversers in the bandwidth of 0~5 GHz.In addition,the designed TSADC system can achieve an effective analog bandwidth of 8 GHz and an effective sampling rate of 200 GS/s.
彭迪, 张旨遥, 杨帆, 袁飞, 刘永. 基于十倍光学拉伸的5GHz微波信号模数转换研究[J]. 光子学报, 2014, 43(7): 0706015. PENG Di, ZHANG Zhiyao, YANG Fan, YUAN Fei, LIU Yong. Demonstration of a 10Fold StretchFactor Photonic AnalogtoDigital Converter For a 5 GHz RadioFrequency Signal[J]. ACTA PHOTONICA SINICA, 2014, 43(7): 0706015.