Liquid crystal-based optical controllers for phased-array antennas

Nabeel A. Riza

doi:10.1117/12.177399

Liquid crystal-based optical controllers for phased-array antennas

Nabeel A. Riza

General Electric

Research output: Contribution to journal › Article › peer-review

Abstract

A 25 channel, 1-bit, free-space, nematic liquid crystal (NLC) spatial light modulator (SLM)-based optical time delay unit (OTDU) is demonstrated with worst case rf signal-to-noise ratios (SNRs) ranging from 50-60 dB for various delay/no-delay modes of operation. Single channel performance demonstrating essentially no crosstalk gives rf SNRs from 74-85 dB (all other channels are not fed by optical beams in this mode). A frequency up-conversion method for the phase-based acousto-optic (AO) 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 (I) and quadrature (Q) optical beamformer is demonstrated.

Original language	English
Pages (from-to)	169-180
Number of pages	12
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2155
DOIs	https://doi.org/10.1117/12.177399
Publication status	Published - 10 Jun 1994
Externally published	Yes
Event	Optoelectronic Signal Processing for Phased-Array Antennas IV 1994 - Los Angeles, United States Duration: 23 Jan 1994 → 29 Jan 1994

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10.1117/12.177399

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title = "Liquid crystal-based optical controllers for phased-array antennas",

abstract = "A 25 channel, 1-bit, free-space, nematic liquid crystal (NLC) spatial light modulator (SLM)-based optical time delay unit (OTDU) is demonstrated with worst case rf signal-to-noise ratios (SNRs) ranging from 50-60 dB for various delay/no-delay modes of operation. Single channel performance demonstrating essentially no crosstalk gives rf SNRs from 74-85 dB (all other channels are not fed by optical beams in this mode). A frequency up-conversion method for the phase-based acousto-optic (AO) 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 (I) and quadrature (Q) optical beamformer is demonstrated.",

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N2 - A 25 channel, 1-bit, free-space, nematic liquid crystal (NLC) spatial light modulator (SLM)-based optical time delay unit (OTDU) is demonstrated with worst case rf signal-to-noise ratios (SNRs) ranging from 50-60 dB for various delay/no-delay modes of operation. Single channel performance demonstrating essentially no crosstalk gives rf SNRs from 74-85 dB (all other channels are not fed by optical beams in this mode). A frequency up-conversion method for the phase-based acousto-optic (AO) 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 (I) and quadrature (Q) optical beamformer is demonstrated.

AB - A 25 channel, 1-bit, free-space, nematic liquid crystal (NLC) spatial light modulator (SLM)-based optical time delay unit (OTDU) is demonstrated with worst case rf signal-to-noise ratios (SNRs) ranging from 50-60 dB for various delay/no-delay modes of operation. Single channel performance demonstrating essentially no crosstalk gives rf SNRs from 74-85 dB (all other channels are not fed by optical beams in this mode). A frequency up-conversion method for the phase-based acousto-optic (AO) 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 (I) and quadrature (Q) optical beamformer is demonstrated.

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DO - 10.1117/12.177399

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VL - 2155

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JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Optoelectronic Signal Processing for Phased-Array Antennas IV 1994

Y2 - 23 January 1994 through 29 January 1994

ER -

Liquid crystal-based optical controllers for phased-array antennas

Abstract

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