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Proceedings Paper

Two optical-control techniques for phased array: interferometric and dispersive-fiber true time delay
Author(s): Ronald D. Esman; Michael Y. Frankel; J. L. Dexter; Lew Goldberg; Mark G. Parent; Denzil Stilwell
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Paper Abstract

We describe and present experimental results for two optical control techniques for phased array antennas. The first technique is based on interferometric heterodyning of two narrow- linewidth YAG lasers for the generation of required microwave signal and for simultaneous steering of the radiated beam. The constructed system is simple and well-suited for narrowband applications, and it may be built without any active mechanical components. The measured radiated antenna patterns are in close agreement with the predicted ones. The second technique is a novel and elegant method for implementing a true time-delay function for optical control. It relies on using a wavelength-tunable laser to provide the optical carrier for the microwave signal and a fiber-optic prism--a set of equal delay fibers with differing net dispersion. The relative interelement time-delay (beam angle) adjustment is accomplished by tuning the optical carrier wavelength. The experimental results obtained on a compact antenna range clearly demonstrate beam-steering and true time-delay operation over a two-octave bandwidth.

Paper Details

Date Published: 17 September 1993
PDF: 11 pages
Proc. SPIE 1958, Transition of Optical Processors into Systems 1993, (17 September 1993); doi: 10.1117/12.157123
Show Author Affiliations
Ronald D. Esman, Naval Research Lab. (United States)
Michael Y. Frankel, Naval Research Lab. (United States)
J. L. Dexter, Naval Research Lab. (United States)
Lew Goldberg, Naval Research Lab. (United States)
Mark G. Parent, Naval Research Lab. (United States)
Denzil Stilwell, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 1958:
Transition of Optical Processors into Systems 1993
David P. Casasent, Editor(s)

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