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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 method of photogenerated phase encoding microwave signal is proposed and verified. The main principle of the method is to beat the encoded coherent light sideband to obtain a phase-coded microwave signal with high frequency, high encoding rate and low noise. The method is simple, easy to integrate, is conducive to integration, can adapt to different coding rates, and generates a wide range of microwave signal frequencies and can solve the “electronic bottleneck” problem encountered in electronic circuit methods. The principle of the proposed method is introduced and the theoretical deduction is made. In the system analysis, the phase noise of the modulator drive signal is added to make the system modeling more scientific and perfect. The experimental design and fabrication of the required fiber grating band-stop filter The experimental results agree well with the theoretical ones, which proves that the proposed method can improve the pulse compression ratio.