Digital processing of RF signals from optical frequency combs

Martin Cizek; Radek Smid; Zdeněk Buchta; Břetislav Mikel; Josef Lazar; Ondřej Cip

doi:10.1117/12.2015374

31 January 2013 Digital processing of RF signals from optical frequency combs

Martin Cizek, Radek Smid, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, Ondřej Cip

Proceedings Volume 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation; 87591V (2013) https://doi.org/10.1117/12.2015374
Event: International Symposium on Precision Engineering Measurement and Instrumentation 2012, 2012, Chengdu, China

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, using digital servo-loop techniques for locking free running continuous laser sources on single components of the fs comb spectrum. Secondly, we are experimenting with digital signal processing of the RF beat note spectrum produced by f–2f ¹ technique used for assessing the offset and repetition frequencies of the comb, resulting in digital servo-loop stabilization of the fs comb. 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 frequency of the fs comb.

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Martin Cizek, Radek Smid, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, and Ondřej Cip "Digital processing of RF signals from optical frequency combs", Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87591V (31 January 2013); https://doi.org/10.1117/12.2015374

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KEYWORDS

Digital signal processing

Frequency combs

Laser sources

Continuous wave operation

Femtosecond phenomena

Signal processing

Demodulation

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