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Optical Engineering

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

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 (8 to 12 GHz) phased-array antenna (PAA) system. The dispersion of the fabricated photonic crystal fibers (PCFs) is as high as –600 ps/nm km at 1550 nm. By employing PCFs to increase the dispersion, the TTD module size can be proportionally reduced. The time delay is continuously tunable from –31 ps to 31 ps between adjacent delay lines by tuning the laser wavelength continuously from 1528 to 1560 nm. The far-field radiation patterns of a 1×4 subarray were measured from –45 to 45 deg 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.

Paper Details

Date Published: 1 December 2005
PDF: 8 pages
Opt. Eng. 44(12) 125001 doi: 10.1117/1.2149327
Published in: Optical Engineering Volume 44, Issue 12
Show Author Affiliations
Yongqiang Jiang, The Univ. of Texas at Austin (United States)
Zhong Shi, The Univ. of Texas at Austin (United States)
Brie Howley, The Univ. of Texas at Austin (United States)
Xiaonan Chen, The Univ. of Texas at Austin (United States)
Maggie Yihong Chen, Omega Optics, Inc. (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)

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