Liquid-crystal-based optical controllers for phased-array antennas

Nabeel A. Riza

doi:10.1117/12.177399

10 June 1994 Liquid-crystal-based optical controllers for phased-array antennas

Nabeel A. Riza

Proceedings Volume 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV; (1994) https://doi.org/10.1117/12.177399
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

Citation Download Citation

Nabeel A. Riza "Liquid-crystal-based optical controllers for phased-array antennas", Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); https://doi.org/10.1117/12.177399

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