NDLI: Integrated MicroPhotonic Beamformer for Broadband Adaptive Nulling in Smart Antennas

Content Provider	IEEE Xplore Digital Library
Copyright Year	2006
Abstract	Summary form only given. The enormous growth of the number of broadband wireless subscribers has driven the need for increasing the capacity of wireless networks to accommodate larger volumes of broadband subscribers. Digital signal processing is currently thwarted by the limited bandwidth of analog-to-digital converters and conventional radio frequency (RF) signal processing is also limited by the loss of metallic media at RF frequencies. Photonic RF signal processing is a promising approach which allows wideband RF signals to be delayed in the optical domain with negligible loss. This paper presents an integrated microphotonic beamformer that processes RF-modulated optical signals to adaptively synthesise multiple broadband nulls in smart phased-array antennas. In this system, the incoming antenna RF signals are split and converted into modulated optical beams via a vertical cavity surface emitting laser (VCSEL) array and routed into a multi-cavity optical substrate, which generates different true-time delayed versions of the input RF signals. A photoreceiver array, operating in ON-OFF mode, integrated onto the optical substrate converts the modulated light beams into RF signals and combines them to produce the output RF signal. By selecting and combining appropriate delayed signals arbitrary broadband spatial nulls can be synthesised. The beamformer is designed to operate at 5.6 GHz with 1 GHz bandwidth. Results showing the design and performance of the different photonic and RF components were presented.
Starting Page	1
Ending Page	1
File Size	58885
Page Count	1
File Format	PDF
ISBN	1424408482
DOI	10.1109/WAMICON.2006.351937
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadband antennas Adaptive arrays Optical modulation Optical signal processing Radio frequency Stimulated emission Optical arrays Delay Vertical cavity surface emitting lasers Digital signal processing Photonic RF signal processing Adaptive nulling Broadband beamforming Phased array antennas True-time-delay generation
Content Type	Text
Resource Type	Article

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