Photonic generation of terahertz dual-chirp waveforms ranging from 364 to 392 GHz
Shiwei Wang, Lu Zhang, Zijie Lu, Hongqi Zhang, Mengyao Qiao, Nazar Muhammad Idrees, Muhammad Saqlain, Shilie Zheng, Xiaofeng Jin, Xianmin Zhang, Xianbin Yu
Abstract
In this paper, we propose and experimentally demonstrate a photonic scheme based on frequency doubling and photo-mixing to generate dual-chirp signals in the terahertz (THz) band. A broadband dual-chirp THz signal with 28 GHz bandwidth, ranging from 364 GHz to 392 GHz, is successfully generated in the proof-of-concept experiment, resulting in a chirp rate of 0.028 GHz/ns for both up chirp and down chirp signals. THz dual-chirp signals featuring a large bandwidth are beneficial to enable high resolution and high accuracy by mitigating the range measurement error induced by the range-Doppler coupling effect. Therefore, the proposed system is expected to have a great potential for future THz radar applications.