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 18.22 GHz, each with a FWHM time width of ≈25 ps, is generated from a sinusoidal RF tone of only 3.680 GHz, 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
Original Manuscript: August 14, 2007
Revised Manuscript: November 19, 2007
Manuscript Accepted: November 29, 2007
Published: January 8, 2008
Naum K. Berger, Boris Levit, Baruch Fischer, and José Azaña, "Picosecond flat-top pulse generation by low-bandwidth electro-optic sinusoidal phase modulation," Opt. Lett. 33, 125-127 (2008)