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Proceedings Paper

Liquid-crystal-based optical controllers for phased-array antennas
Author(s): Nabeel A. Riza
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Paper Abstract

A 25-channel, 1-bit, free-space, nematic liquid crystal (NLC) spatial light modulator-based optical time delay unit is demonstrated with worst case rf SNRs ranging from 50 to 60 dB for various delay/no-delay modes of operation. Single channel performance demonstrating essentially no crosstalk gives rf SNRs from 74 to 85 dB (all other channels are not fed by optical beams in this mode). A frequency up-conversion method for the phase- based acousto-optic NLC analog optical beamformer is demonstrated at 1015 MHz, showing a record -72.1 dB rf signal power nulling using a parallel-rub NLC device. A novel in-phase and quadrature optical beamformer is demonstrated.

Paper Details

Date Published: 10 June 1994
PDF: 12 pages
Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); doi: 10.1117/12.177399
Show Author Affiliations
Nabeel A. Riza, GE Corporate Research and Development Ctr. (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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