Li Peng, Yan Lianshan, Ye Jia, Zou Xiha, Luo Bin, Pan Wei
Opt Lett. 2020 Apr 1;45(7):1990-1993. doi: 10.1364/OL.389694.
A photonic approach to generate switchable down-, up-, and dual-chirped linear frequency-modulated (LFM) microwave signals utilizing a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM) is proposed and experimentally demonstrated. By properly controlling the radio frequency signals and baseband LFM signals applied to the DP-DPMZM, switchable down-, up-, and dual-chirped LFM microwave signals with a tunable center frequency and chirp rate can be obtained. Experimental results show that switchable down-, up-, and dual-chirped LFM signals with a center frequency of 5 GHz and chirp rate of 1 GHz/4 µs are generated. In addition, the tunability of the center frequency and chirp rate of the generated microwave signals are also demonstrated.
提出并通过实验证明了一种利用双偏振双平行马赫-曾德尔调制器（DP-DPMZM）产生可切换的下行、上行和双啁啾线性调频（LFM）微波信号的光子学方法。通过适当地控制施加到DP-DPMZM的射频信号和基带LFM信号，可以获得具有可调中心频率和啁啾率的可切换下行、上行和双啁啾LFM微波信号。实验结果表明，产生了中心频率为5 GHz、啁啾率为1 GHz/4 µs的可切换下行、上行和双啁啾LFM信号。此外，还展示了所产生微波信号的中心频率和啁啾率的可调性。
