Yi Chongyin, Yang Shuna, Yang Bo, Jin Tao, Chi Hao
Opt Lett. 2021 Apr 1;46(7):1578-1581. doi: 10.1364/OL.420988.
A novel photonic approach for generating switchable multi-format chirp RF waveforms is proposed and experimentally demonstrated. The key component in the scheme is a dual-parallel Mach-Zehnder modulator (DPMZM). By properly setting the bias voltage on the DPMZM, different chirp RF waveforms with a doubled bandwidth, including the dual-, up-, and down-chirp waveforms, can be generated, when an unmodulated RF signal and a chirp RF signal are injected. The experiments are implemented to demonstrate the generation of switchable chirp waveforms with bandwidths of 2 and 0.8 GHz. The proposed scheme features its compact structure, easiness in switching control, as well as bandwidth doubling, which has potential applications in multifunctional radars.
提出并通过实验证明了一种用于生成可切换多格式啁啾射频波形的新型光子学方法。该方案的关键组件是一个双并行马赫-曾德尔调制器（DPMZM）。当注入未调制的射频信号和啁啾射频信号时，通过适当设置DPMZM上的偏置电压，可以生成具有两倍带宽的不同啁啾射频波形，包括双啁啾、升啁啾和降啁啾波形。进行实验以演示带宽为2 GHz和0.8 GHz的可切换啁啾波形的生成。所提出的方案具有结构紧凑、切换控制容易以及带宽加倍的特点，在多功能雷达中具有潜在应用。
