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Generating the orbital angular momentum of radio frequency signals using optical-true-time-delay unit based on optical spectrum processor

A system for generating radio frequency signals with orbital angular momentum (OAM) is proposed and certificated for the first time, which employs an array of multiple optical-true-time-delay elements and circular antennas array (CAAs). A constructive Fourier series theory about CAAs collectively fo...

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Bibliographic Details
Published in:Optics letters 2014-05, Vol.39 (9), p.2652-2655
Main Authors: Gao, Xinlu, Huang, Shanguo, Song, Yunlong, Li, Shangyuan, Wei, Yongfeng, Zhou, Jing, Zheng, Xiaoping, Zhang, Hanyi, Gu, Wanyi
Format: Article
Language:English
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Summary:A system for generating radio frequency signals with orbital angular momentum (OAM) is proposed and certificated for the first time, which employs an array of multiple optical-true-time-delay elements and circular antennas array (CAAs). A constructive Fourier series theory about CAAs collectively forming an OAM radio beam is demonstrated. An optical spectrum processor offers the four lines high-resolution time delay by adding a series of linear optical phase shifts. The OAM radio beam with topological charge L=1 is produced and measured successfully.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.002652