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Sluggish light for radio-frequency true-time-delay applications with a large time–bandwidth product

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Abstract

A new radio-frequency (RF) photonic technique for achieving large RF time delays has been experimentally demonstrated using femtosecond pulses modulated by an acousto-optic tunable filter in a frequency-mapped and Doppler-shifted modulation scheme. A short optical delay line with length of 240μm produces nearly 3μs RF time delay after optical heterodyne detection, resulting in an effective slow-light velocity of 86ms. A delay-to-pulse-width ratio of 20 based on this technique has been observed, with a larger fractional delay foreseeable.

© 2006 Optical Society of America

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