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Picosecond flat-top pulse generation by low-bandwidth electro-optic sinusoidal phase modulation

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Abstract

We report the first experimental demonstration to our knowledge of a microwave frequency upshifting system based on phase modulation. A sequence of flat-top optical and RF pulses at a repetition rate of 18.22GHz, each with a FWHM time width of 25ps, is generated from a sinusoidal RF tone of only 3.680GHz, in good agreement with our analytical and numerical calculations. A simple explanation of this technique based on Talbot effect theory is provided. The practical limitations and capabilities of the phase-modulation-based frequency upshifting approach for ultrabroadband RF waveform generation are also discussed.

© 2008 Optical Society of America

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