Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 21, Number 1, 2025
|
|
---|---|---|
Article Number | 2 | |
Number of page(s) | 12 | |
DOI | https://doi.org/10.1051/jeos/2024046 | |
Published online | 22 January 2025 |
Review Article
A review of research on optical true time delay technology
Army Engineering University Shijiazhuang Campus, Shijiazhuang 050003, China
* Corresponding author: antinghbdl@163.com
Received:
4
August
2024
Accepted:
13
November
2024
Light controlled phased array has the advantages of fast response speed, compact system, diverse functions, and flexible control, and has been widely applied in many scientific and technological fields. Optical true delay technology (OTTD) is the most direct technical means to achieve phase delay of optical carrier signals, and it is also the most basic technical means to implement optical controlled beamforming systems. In order to fully understand the optical true delay technology, this article first elaborates on the principle of phased array antennas and the reasons for beam squint, and analyzes the impact of true delay on the performance of phased array radar. Then, the basic principle, technological progress, and related applications of optical true delay are introduced. Taking four common structures of optical true delay lines as examples, which are micro-ring resonant cavity array, grating true time delay line, multi-path switchable optical true time delay line (OTTDL), and wavelength selective optical delay line, their performance in delay accuracy, adjustable delay range, and frequency bandwidth are compared. Finally, the current problems and future development trends of optical controlled beamforming technology were summarized.
Key words: Microwave photonics / True time delay (TTD) / Optical true delay technology (OTTD) / Optically controlled beamforming network / Light controlled phased array
© The Author(s), published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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