Opt Lett. 2013 Oct 15;38(20):4256-9. doi: 10.1364/OL.38.004256.
A scheme for photonic generation of pulsed microwave signals with tunable frequency and phase based on optical spectral-shaping and frequency-to-time mapping is proposed and experimentally demonstrated. The spectral shaping is realized by a tunable optical comb filter consisting of a differential group delay (DGD) element, a polarization modulator (PolM), and a polarizer. By passing a short optical pulse through the tunable comb filter and a dispersive element (DE), a pulsed microwave signal is generated after optical-to-electrical conversion. The phase of the generated microwave signal can be continuously tuned by tuning the voltage applied to the PolM. The frequency of the microwave signal can be tuned by changing the DGD and/or the dispersion of the DE. An experiment is performed. The generation of a pulsed microwave signal with tunable frequency and phase is demonstrated.
提出并实验演示了一种基于光光谱整形和频域到时域映射的光子产生可调谐频率和相位脉冲微波信号的方案。光谱整形通过由差分群延迟（DGD）元件、偏振调制器（PolM）和偏振器组成的可调谐光梳滤波器来实现。通过将短光脉冲通过可调谐梳滤波器和色散元件（DE），在光-电转换后产生脉冲微波信号。通过调节施加到 PolM 的电压，可以连续调节所产生的微波信号的相位。通过改变 DGD 和/或 DE 的色散，可以调节微波信号的频率。进行了实验。演示了具有可调谐频率和相位的脉冲微波信号的产生。
