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Proceedings Paper

Ultra-Wideband Direction Finding Using A Fiber Optic Beamforming Processor
Author(s): Stephen A Pappert
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Paper Abstract

This paper describes a wideband electro-optic direction finding (DF) processor employing an array of laser diodes, an array of photodetectors, and a network of fiber optic delay lines. This DF filter offers a potential operational bandwidth in excess of 10 GHz and allows for multiple, simultaneous beam angular responses with peaks which are independent of frequency. Two eight-laser, two-beam laboratory test model DF devices, one utilizing multimode optical fiber and the other single-mode fiber, were constructed. These experimental optical beamforming filters are operable in the 100-2000 MHz frequency range and can simultaneously monitor two angles of arrival. Experiments were performed to determine the two system's sensitivity, dynamic range, angular resolution, and frequency response. It is concluded from theoretical and experimental results obtained that the multimode DF device is slightly superior in performance to the single-mode system due to the higher throughput optical power levels possible with multimode systems. Further, it is concluded that this fiber optic beamforming processor can be a useful device for ultra-wideband DF.

Paper Details

Date Published: 12 April 1988
PDF: 8 pages
Proc. SPIE 0886, Optoelectronic Signal Processing for Phased-Array Antennas, (12 April 1988); doi: 10.1117/12.944202
Show Author Affiliations
Stephen A Pappert, Naval Ocean Systems Center (United States)

Published in SPIE Proceedings Vol. 0886:
Optoelectronic Signal Processing for Phased-Array Antennas
Kul B. Bhasin; Brian M. Hendrickson, Editor(s)

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