Digital processing of signals from femtosecond combs

Martin Čížek; Radek Šmíd; Zdeněk Buchta; Břetislav Mikel; Josef Lazar; Ondrej Číp

doi:10.1117/12.2010591

18 December 2012 Digital processing of signals from femtosecond combs

Martin Čížek, Radek Šmíd, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, Ondrej Číp

Proceedings Volume 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 86970H (2012) https://doi.org/10.1117/12.2010591
Event: 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2012, Ostravice, Czech Republic

Abstract

The presented work is focused on digital processing of beat note signals from a femtosecond optical frequency comb. The levels of mixing products of single spectral components of the comb with CW laser sources are usually very low compared to products of mixing all the comb components together. RF counters are more likely to measure the frequency of the strongest spectral component rather than a weak beat note. Proposed experimental digital signal processing system solves this problem by analyzing the whole spectrum of the output RF signal and using software defined radio (SDR) algorithms. Our efforts concentrate in two main areas: Firstly, we are experimenting with digital signal processing of the RF beat note spectrum produced by f–2f ¹ technique and with fully digital servo-loop stabilization of the fs comb. Secondly, we are using digital servo-loop techniques for locking free running continuous laser sources on single components of the fs comb spectrum. Software capable of computing and analyzing the beat-note RF spectrums using FFT and peak detection was developed. A SDR algorithm performing phase demodulation on the f– 2f signal is used as a regulation error signal source for a digital phase-locked loop stabilizing the offset and repetition frequencies of the fs comb.

Citation Download Citation

Martin Čížek, Radek Šmíd, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, and Ondrej Číp "Digital processing of signals from femtosecond combs", Proc. SPIE 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 86970H (18 December 2012); https://doi.org/10.1117/12.2010591

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