光生频率大范围可调的相位编码微波信号  

Photonic Generation of Phase-Coded Microwave Signal with Large Frequency Tunability

作　　者：刘双[1] 钱祖平[1] 王荣[1] 蒲涛[1] 

机构地区：[1]中国人民解放军理工大学通信工程学院,江苏南京210007

出　　处：《光学学报》2013年第4期29-33,共5页Acta Optica Sinica

基　　金：国家自然科学基金重点项目(61032005);国家自然科学基金(61177065);国家973计划(2012CB315603)资助课题

摘　　要：提出并验证了一种光生相位编码微波信号的方法,其主要原理是对编码的相干光边带进行差拍,从而得到高频率、高编码数率、低噪声的相位编码微波信号。该方法简单易行,利于集成,能适应不同的编码速率,产生的微波信号频率大范围可调,能解决电子电路方法中遇到的"电子瓶颈"问题。介绍了所提方法的原理,并进行了理论推导,在系统分析中加入了对调制器驱动信号相位噪声的分析,使得系统建模更加科学完善;实验设计制作了所需的光纤光栅带阻滤波器,产生了20GHz和25GHz的相位编码微波信号,实验结果与理论值几乎吻合,证明了所提方法提高脉冲压缩比的能力。A photonic approach to generating a phase-coded microwave signal is proposed and demonstrated. The main principle is to beat the encoded coherent optical sideband to obtain high-frequency, high-coding rate, low-noise encoded microwave signals. The proposed technique, which is simple and conducive to integration, can adapt to different coding rates, generate phase-coded microwave signals with tunable frequency, and solve the bottleneck problem of traditional electronic approaches. The principle is discussed in detail. Mathematical models are developed to consider perturbation on the generated coded signal caused by the phase fluctuations of the microwave driving signal and the optical carrier. The required fiber Bragg grating notch filter is fabricated, and 20 GHz and 25 GHz phase-coded microwave signals are experimentally generated, respectively. The experimental results agree well with theoretical values, and it is proved that the proposed method improves the pulse compression capability.

关 键 词：光通信 微波光子学 光生微波 光纤布拉格光栅 脉冲压缩 

分 类 号：TN929.11[电子电信—通信与信息系统]