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Proceedings Paper

True-time-delay transmit/receive optical beam-forming system for phased arrays and other signal processing applications
Author(s): Edward N. Toughlian; H. Zamuda; Charity A. Carter
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Paper Abstract

This paper addresses the problem of dynamic optical processing for the control of phased array antennas. The significant result presented is the demonstration of a continuously variable photonic RF/microwave delay line. Specifically, it is shown that by applying spatial frequency dependent optical phase compensation in an optical heterodyne process, variable RF delay can be achieved over a prescribed frequency band. Experimental results which demonstrate the performance of the delay line with regard to both maximum delay and resolution over a broad bandwidth are presented. Additionally, a spatially integrated optical system is proposed for control of phased array antennas. The integrated system provides mechanical stability, essentially eliminates the drift problems associated with free space optical systems, and can provide high packing density. This approach uses a class of spatial light modulator known as a deformable mirror device and leads to a steerable arbitrary antenna radiation pattern of the true time delay type. Also considered is the ability to utilize the delay line as a general photonic signal processing element in an adaptive (reconfigurable) transversal frequency filter configuration. Such systems are widely applicable in jammer/noise canceling systems, broadband ISDN, spread spectrum secure communications and the like.

Paper Details

Date Published: 10 June 1994
PDF: 11 pages
Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); doi: 10.1117/12.177400
Show Author Affiliations
Edward N. Toughlian, Rome Lab. (United States)
H. Zamuda, Stevens Institute of Technology (United States)
Charity A. Carter, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2155:
Optoelectronic Signal Processing for Phased-Array Antennas IV
Brian M. Hendrickson, Editor(s)

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