Realization of true-time delay lines based on acoustooptics

A true-time optical delay line for short radiofrequency (RF) pulses using path length dispersion is proposed. It is an optical implementation of the linear phase-shift theorem of the Fourier transformation. Acoustooptic signal processing is used for conversion into the optical frequency domain and f...

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Bibliographic Details
Published in:Journal of lightwave technology 2002-04, Vol.20 (4), p.730-739
Main Authors: Maak, P., Frigyes, I., Jakab, L., Habermayer, I., Gyukics, M., Richter, P.
Format: Article
Language:English
Subjects:
Acoustooptics
Applied sciences
Circuit properties
Delay lines
Dispersions
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Filtering
Laser radar
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Optical arrays
Optical filters
Optical mixing
Optical pulses
Optical signal processing
Phase shift
Phased arrays
Radar antennas
Radio frequencies
Radio frequency
Theorems
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Summary:A true-time optical delay line for short radiofrequency (RF) pulses using path length dispersion is proposed. It is an optical implementation of the linear phase-shift theorem of the Fourier transformation. Acoustooptic signal processing is used for conversion into the optical frequency domain and for spatial Fourier decomposition of the pulse. The processing of the pulse is obtained by differentially phase shifting the particular frequency components, followed by a heterodyne reconversion into the RF domain. The optical system is intended to be used for delaying, but also for shaping and filtering of RF pulses, mainly in phased array radar antennas. Theoretical analysis of the system principle is given together with experimental results, demonstrating 2-/spl mu/s time delay of 0.5-/spl mu/s-long pulses with maximum optical phase shift of 1.2/spl pi/. A detailed theoretical and experimental bandwidth analysis is carried out, pointing to the main technical problems and their solutions.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.996597