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Delay-time-enhanced photonic crystal fiber array for wireless communications using two-dimensional X-band phased-array antennas

Continuously tunable optical true time-delay (TTD) modules based on dispersion-enhanced photonic crystal fibers (DEPCFs) are demonstrated to provide continuous microwave squint-free beam scanning for an X-band phased-array antenna (PAA) system. The dispersion of the fabricated photonic crystal fiber...

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Bibliographic Details
Published in:Optical Engineering 2005-12, Vol.44 (12), p.125001-125008
Main Authors: Jiang, Yongqiang, Shi, Zhong, Howley, Brie, Chen, Xiaonan, Chen, Maggie Y, Chen, Ray T
Format: Article
Language:English
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Summary:Continuously tunable optical true time-delay (TTD) modules based on dispersion-enhanced photonic crystal fibers (DEPCFs) are demonstrated to provide continuous microwave squint-free beam scanning for an X-band phased-array antenna (PAA) system. The dispersion of the fabricated photonic crystal fibers (PCFs) is as high as at . By employing PCFs to increase the dispersion, the TTD module size can be proportionally reduced. The time delay is continuously tunable from between adjacent delay lines by tuning the laser wavelength continuously from . The far-field radiation patterns of a subarray were measured from scanning angles. Squint-free operation is experimentally confirmed. Wavelength conversion is also demonstrated to confirm that time-delay information can be successfully transferred from one wavelength to the other without being changed, which is suitable to be implemented in 2-D phased-array antenna systems. The TTD formation idea presented is suitable for not only the X band, but also the other higher microwave frequencies, such as the K band.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.2149327