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Proceedings Paper

Sluggish light and its applications in true-time-delay beam forming for wideband RF phased-array antennas
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Paper Abstract

In this paper, we present a new photonic technique for producing large time delay of radio-frequency (RF) modulated optical signals and its application in a novel true-time-delay (TTD) multiple beam-forming system for wideband RF phased-array antennas using Fourier optics. The RF signal to be delayed is modulated onto a broadband optical carrier in a frequency-mapped manner by an acousto-optic tunable filter (AOTF). Due to the phased-matched acousto-optic interaction and the moving nature of the acoustic waves in the AOTF, di.erent frequency components of the optical carrier are only modulated and Doppler-shifted by the corresponding frequencies of the modulating RF signal. Heterodyne detection between the modulated optical beam and a timealigned reference beam from the same light source can recover the modulating RF signal. When a small optical path length di.erence is introduced between the heterodyne beams, a large RF time delay magnified by the frequency ratio between the optics and the RF will be generated, which we refer to as the sluggish-light effect. Sluggish light has potential applications in TTD beam forming for wideband RF phased-array antennas and proof-of-concept experiments of the sluggish-light based TTD beam forming for an emulated 2- and 4-channel RF array will be presented in this paper.

Paper Details

Date Published: 6 February 2007
PDF: 10 pages
Proc. SPIE 6482, Advanced Optical and Quantum Memories and Computing IV, 648205 (6 February 2007); doi: 10.1117/12.716387
Show Author Affiliations
Lu Gao, Univ. of Colorado, Boulder (United States)
Sandrine I. Herriot, Univ. of Colorado, Boulder (United States)
Kelvin H. Wagner, Univ. of Colorado, Boulder (United States)


Published in SPIE Proceedings Vol. 6482:
Advanced Optical and Quantum Memories and Computing IV
Zameer U. Hasan; Alan E. Craig; Selim M. Shahriar; Hans J. Coufal, Editor(s)

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