Analysis on Reducing the Bandwidth of Kelly Sidebands in Mode-Locking Fiber Laser for Narrow Terahertz Signal Generation

Weiqian Zhao; Youyou Hu; Mingya Shen; Qiyan Feng

doi:10.3390/photonics11121124

Photonics (Nov 2024)

Analysis on Reducing the Bandwidth of Kelly Sidebands in Mode-Locking Fiber Laser for Narrow Terahertz Signal Generation

Weiqian Zhao,
Youyou Hu,
Mingya Shen,
Qiyan Feng

Affiliations

Weiqian Zhao: School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China
Youyou Hu: School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China
Mingya Shen: Institute of Applied Photonic Technology, Yangzhou University, Yangzhou 225002, China
Qiyan Feng: School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China

DOI: https://doi.org/10.3390/photonics11121124
Journal volume & issue: Vol. 11, no. 12
p. 1124

Abstract

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The bandwidth of the ±1-order Kelly sidebands of mode-locking fiber lasers is investigated for narrow terahertz (THz) signal generation. Four key factors influencing the bandwidth of Kelly sidebands are found and analyzed in detail. Then, a numerical model is presented for manipulating the parameters of the mode-locking fiber laser. Two mode-locking fiber lasers are designed for generating narrow sidebands. The bandwidth of the ±1-order Kelly sidebands is reduced to 0.041 nm and 0.021 nm for the sidebands with different spacings. Using the data obtained from the optical spectra with narrow bandwidth Kelly sidebands, the frequency spectra of the generated THz signals are obtained. Finally, the bandwidth of the generated THz signals is reduced to 7.16 GHz and 3.4 GHz, respectively.

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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