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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References

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2006 (2)

2004 (2)

N. K. Berger, B. Levit, A. Bekker, and B. Fischer, IEEE Photon. Technol. Lett. 16, 1855 (2004).
[CrossRef]

J. Azaña, N. K. Berger, B. Levit, V. Smulakowsky, and B. Fischer, Opt. Lett. 29, 2849 (2004).
[CrossRef]

1998 (1)

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Figures (2)

Fig. 1
Fig. 1

Schematic of the experimental setup. EDFRL, erbium-doped fiber ring laser; Modul., EO phase modulator; EDFA, erbium-doped fiber amplifier; RFA, RF amplifier; Synch., synchronization; Trigg., triggering; Synth., RF synthesizer; OSA, optical spectrum analyzer; Oscill., sampling oscilloscope.

Fig. 2
Fig. 2

(a) Modulated pulse train experimentally measured at the system output (inset, measured input laser pulse spectrum). (b) Detail of the measured individual pulses with a nearly flat-top shape (inset, calculated RF spectrum of one of these pulses). The input modulation frequency is 3.680 GHz , and the multiplied output frequency (repetition rate) is 18.22 GHz .

Equations (3)

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E out ( t ) = n = N N J n ( A ) exp ( i β 2 L n 2 ω m 2 2 ) exp ( i n ω m t ) .
F com ( ω ) = n = N N J n ( A ) F las ( ω n ω m ) exp [ i M t β 2 ( 1 ) L 1 ( ω n ω m M t ) 2 2 ] × exp [ i β 2 ( 2 ) L 2 n 2 ω m 2 ( 2 M t ) ] ,
E com ( t ) = E str ( t ) n = N N J n ( A ) exp [ i M t β 2 ( 2 ) L 2 n 2 ( ω m M t ) 2 2 ] exp [ i n ( ω m M t ) t ] ,

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