Open AccessPhotonic generation of terahertz dual-chirp waveforms ranging from 364 to 392 GHz
Author(s) -
Shiwei Wang,
Lu Zhang,
Zijie Lu,
Hongqi Zhang,
Mengyao Qiao,
Nazar Muhammad Idrees,
Muhammad Saqlain,
Shilie Zheng,
Xiaofeng Jin,
Xianmin Zhang,
Xianbin Yu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.422407
Subject(s) - chirp , terahertz radiation , optics , broadband , bandwidth (computing) , chirp spread spectrum , ranging , photonics , waveform , physics , radar , optoelectronics , telecommunications , computer science , laser , spread spectrum , direct sequence spread spectrum , channel (broadcasting)
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.