Generation of Flat Terahertz Noise by Mixing Incoherent Light Fields

Youwen Zhang; Wenjie Liu; Ya Guo; Junbin Liu; Zhiwei Jia; Yuehui Sun; Anbang Wang; Yuncai Wang

doi:10.3390/photonics10070778

Photonics (Jul 2023)

Generation of Flat Terahertz Noise by Mixing Incoherent Light Fields

Youwen Zhang,
Wenjie Liu,
Ya Guo,
Junbin Liu,
Zhiwei Jia,
Yuehui Sun,
Anbang Wang,
Yuncai Wang

Affiliations

Youwen Zhang: Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Wenjie Liu: Key Laboratory of Photonics Technology for Integrated Sensing and Communication, Guangdong University of Technology, Ministry of Education, Guangzhou 510006, China
Ya Guo: School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
Junbin Liu: Key Laboratory of Photonics Technology for Integrated Sensing and Communication, Guangdong University of Technology, Ministry of Education, Guangzhou 510006, China
Zhiwei Jia: Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yuehui Sun: Key Laboratory of Photonics Technology for Integrated Sensing and Communication, Guangdong University of Technology, Ministry of Education, Guangzhou 510006, China
Anbang Wang: Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yuncai Wang: Key Laboratory of Photonics Technology for Integrated Sensing and Communication, Guangdong University of Technology, Ministry of Education, Guangzhou 510006, China

DOI: https://doi.org/10.3390/photonics10070778
Journal volume & issue: Vol. 10, no. 7
p. 778

Abstract

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Terahertz (THz) noise sources play an irreplaceable role in testing THz devices and evaluating THz application systems, and the flatness of their radio frequency (RF) spectra is an important technical parameter. In this paper, a scheme for generating flat THz noise by mixing multiple filtered incoherent light fields is proposed. A theoretical analysis is conducted to investigate the impact of different spectral linewidths and central wavelength differences of incoherent light fields on the noise power and RF spectrum flatness, and an optimized experimental scheme is obtained. The results show that the proposed method can generate a 280–380 GHz flat THz noise signal with an RF spectrum flatness of ±0.5 dB in simulation and ±2.7 dB in our experiments. This article provides an excellent technical solution to the demand for flat THz noise in the THz field.

Published in Photonics

ISSN: 2304-6732 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: http://www.mdpi.com/journal/photonics

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