NDLI: True time delay photonic beamforming: A review

Content Provider	IEEE Xplore Digital Library
Author	Tur, M.
Copyright Year	2009
Description	Author affiliation: Faculty of Engineering, Tel-Aviv University, Tel Aviv, Israel (Tur, M.)
Abstract	Wideband, large phased array antennas, using analog control for angle scanning, require true time delay (TTD), rather than phase shifters, to avoid squint and other impairments in both the temporal and spatial domains. While digital beamforming may eventually become a viable solution for such high-end systems, photonic technology can currently provide the required TTD capabilities. Common to most, if not all photonic solutions is the conversion of the RF signal to light, which after proper photonic processing is detected to produce a delayed RF replica of the input RF signal. This double conversion is quite lossy and often requires optical amplification to achieve the required dynamic range. Many architectures have been proposed for the implementation of TTDs. The talk will discuss some of these proposed architectures, including the use of dispersive components, switched fabrics, chirped Bragg gratings, wavelength division multiplexed approaches, as well as solutions based on nonlinear phenomena such as slow light and stimulated Brillouin scattering. In analyzing these various architectures, the following are among the important characteristics should be examined: (i) Flatness of their RF response; (ii) uniformity among the many TTDs populating the array; (iii) Dynamic range; (iv) Nonlinearities and their implications, as well as complexity, volume, weight and cost. In conclusion, it appears that when properly designed, photonic beamformers have matured to the point, where they can replace classical electronic beamformers, offering extremely wide bandwidth and large scanning angles.
Starting Page	1
Ending Page	2
File Size	61003
Page Count	2
File Format	PDF
ISBN	9781424439850
DOI	10.1109/COMCAS.2009.5385935
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-11-09
Publisher Place	Israel
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phased arrays Radio frequency Optical losses Array signal processing Delay effects Phase shifters Dynamic range Broadband antennas Antenna arrays Photonics
Content Type	Text
Resource Type	Article

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