Mr. Radek Velc Profile

Radek Velc

at CESNET z.s.p.o.

SPIE Involvement:

Author

Publications (19)

Proceedings Article | 20 October 2023 Presentation + Paper

Presentation + Paper

Towards shared fiber dissemination infrastructure for precise time, coherent optical frequency, and entanglement transfers with sensing option

Josef Vojtech, Tomas Novak, Elisabeth Andriantsarazo, Vladimir Smotlacha, Ondrej Havlis, Rudolf Vohnout, Michal Spacek, Martin Slapak, Tomas Horvath, Lada Altmannova, Radek Velc, Petr Pospisil, Jan Kundrat, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Alexander Kuna, Jaroslav Roztocil

Proceedings Volume 12686, 1268604 (2023) https://doi.org/10.1117/12.2677256

KEYWORDS: Optical transmission, Optical coherence, Time metrology, Quantum entanglement, Quantum networks, Quantum key distribution, Quantum frequencies, Quantum coherence, Wavelength division multiplexing networks

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Proceedings Article | 6 June 2023 Presentation + Paper

Presentation + Paper

National infrastructure for dissemination of precise time and ultra-stable optical frequency also aiming to connect quantum sources: CITAF

Josef Vojtech, Vladimir Smotlacha, Ondrej Havlis, Rudolf Vohnout, Michal Spacek, Tomas Novak, Elisabeth Andriantsarazo, Martin Slapak, Lada Altmannova, Radek Velc, Petr Pospisil, Jan Kundrat, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Alexander Kuna, Jaroslav Roztocil

Proceedings Volume 12570, 1257003 (2023) https://doi.org/10.1117/12.2665497

KEYWORDS: Optical transmission, Time metrology, Quantum frequencies, Clocks, Signal attenuation, Reflection, Quantum sources, Quantum beats

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Proceedings Article | 13 December 2022 Paper

Paper

National infrastructure for dissemination of precise time and interconnection of quantum sources of ultra-stable optical frequency CITAF

Josef Vojtech, Ondrej Havlis, Martin Slapak, Lada Altmannova, Vladimir Smotlacha, Petr Pospisil, Jan Kundrat, Rudolf Vohnout, Radek Velc, Elisabeth Andriantsarazo, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Alexander Kuna, Jaroslav Roztocil

Proceedings Volume 12502, 125020R (2022) https://doi.org/10.1117/12.2663805

KEYWORDS: Optical amplifiers, Time metrology, Quantum key distribution, Optical fibers, Connectors, Signal attenuation, Semiconductor optical amplifiers, Fiber amplifiers, Clocks

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Proceedings Article | 4 October 2022 Presentation + Paper

Presentation + Paper

First cross-border trial of quantum key distribution sharing fiber line with data and accurate time transmissions

Josef Vojtech, Rudolf Vohnout, Ondřej Havliš, Petr Pospíšil, Martin Šlapák, Radek Velc, Lada Altmannová, Tomáš Horváth, Jan Kundrát, Michal Hažlinský, Elisabeth Andriantsarazo, Piotr Ridlichowski

Proceedings Volume 12238, 122380H (2022) https://doi.org/10.1117/12.2633616

KEYWORDS: Quantum key distribution, Networks, Network security, Signal attenuation, Wavelength division multiplexing, Multiplexing, Optical fibers

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Proceedings Article | 30 September 2022 Paper

Paper

National research infrastructure for clock network services: CITAF

Josef Vojtech, Ondrej Havlis, Martin Slapak, Vladimir Smotlacha, Radek Velc, Petr Pospisil, Jan Kundrát, Lada Altmannova, Rudolf Vohnout, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Lukas Slodicka

Proceedings Volume 12233, 122330C (2022) https://doi.org/10.1117/12.2635013

KEYWORDS: Optical fibers, Optical amplifiers, Clocks, Time metrology, Optical networks, L band, Quantum key distribution

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Proceedings Article | 19 May 2022 Paper

Paper

Characterization of bi-directional EDFA fibre amplifier in L-band (1595-1610 nm) for long distance transmissions

Sarbojeet Bhowmick, Josef Vojtech, Lada Altmannová, Radek Velc, Martin Šlapak, Ondrej Havliš

Proceedings Volume 12140, 1214006 (2022) https://doi.org/10.1117/12.2621359

KEYWORDS: Optical amplifiers, L band, Fiber amplifiers, Tunable lasers, Erbium, Dense wavelength division multiplexing, Signal to noise ratio, Signal attenuation, Optical networks, Internet

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Proceedings Article | 1 August 2021 Presentation + Paper

Presentation + Paper

Large scale infrastructure for precise time and frequency bidirectional transmission

Josef Vojtech, Ondrej Havlis, Martin Slapak, Vladimir Smotlacha, Tomas Horvath, Lada Altmannova, Radek Velc, Jan Kundrat, Rudolf Vohnout, Sarbojeet Bhowmick, Michal Hazlinsky, Martin Cizek, Jan Hrabina, Lenka Pravdova, Ondrej Cip, Jaroslav Roztocil

Proceedings Volume 11830, 1183002 (2021) https://doi.org/10.1117/12.2592328

KEYWORDS: Networks, Optical amplifiers, Telecommunications, Radio optics, Clocks, Optical networks, Signal detection, Semiconductor optical amplifiers, Optical clocks, Time metrology

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Proceedings Article | 19 April 2021 Poster + Presentation + Paper

Poster + Presentation + Paper

Towards Czech national research infrastructure for Clock Network Services

Josef Vojtech, Vladimir Smotlacha, Ondrej Havlis, Martin Slapak, Jan Kundrat, Sarbojeet Bhowmick, Rudolf Vohnout, Radek Velc, Lada Altmannova, Tomas Horvath, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Alexander Kuna, Jaroslav Roztocil

Proceedings Volume 11772, 117721H (2021) https://doi.org/10.1117/12.2589156

KEYWORDS: Clocks, Precision optics, Optical fibers, Metrology, Time metrology, Photonics, Optical networks, Electronics, Electrical engineering

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Proceedings Article | 18 April 2021 Presentation + Paper

Presentation + Paper

Optical time domain reflectometry on live bidirectionally used fibres deploying DWDM transmissions

Sarbojeet Bhowmick, Josef Vojtech, Lada Altmannová, Radek Velc

Proceedings Volume 11773, 117730X (2021) https://doi.org/10.1117/12.2585616

KEYWORDS: Reflectometry, Fiber amplifiers, Optical amplifiers, Erbium, Connectors

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SPIE Journal Paper | 17 February 2021 Open Access

Open Access

Influence of phase-sensitive optical time-domain reflectometer on community antenna television transmission

Ondrej Havlis, Josef Vojtech, Radek Velc, Martin Slapak, Miloslav Filka, Edvin Skaljo

OE, Vol. 60, Issue 02, 026103, (February 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.2.026103

KEYWORDS: Sensing systems, Antennas, Analog electronics, Optical fibers, Reflectometry, Optical engineering, Signal attenuation, Image quality, Televisions, Receivers

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Proceedings Article | 20 August 2020 Presentation + Paper

Presentation + Paper

Infrared dissemination of precise time and frequency over optical fibers in Europe

Josef Vojtech, Vladimir Smotlacha, Martin Slapak, Jan Kundrat, Rudolf Vohnout, Radek Velc, Ondrej Havlis, Martin Cizek, Jan Hrabina, Lenka Pravdova, Ondrej Cip, Jaroslav Roztocil

Proceedings Volume 11502, 115020N (2020) https://doi.org/10.1117/12.2568002

KEYWORDS: Optical fibers, Networks, Clocks, Time metrology, Metrology, Optical networks, Telecommunications, Optical clocks, Frequency metrology

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Proceedings Article | 1 April 2020 Presentation + Paper

Presentation + Paper

Scope and application of Bi-directional EDFA for long distance optical transmissions

Sarbojeet Bhowmick, Josef Vojtech, Radek Velc

Proceedings Volume 11355, 113550P (2020) https://doi.org/10.1117/12.2553474

KEYWORDS: Optical amplifiers, Signal to noise ratio, Interference (communication), Fiber amplifiers, Tunable lasers, Transmittance, Erbium, Wavelength division multiplexing, Optical fibers, Dense wavelength division multiplexing

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Alternative spectral windows for photonic services distribution

Josef Vojtech, Ondrej Havlis, Martin Slapak, Sarbojeet Bhowmick, Jan Radil, Petr Munster, Tomas Horvath, Radek Velc, Jan Kundrat, Lada Altmannova, Vladimir Smotlacha, Rudolf Vohnout, Jan Hrabina, Martin Cizek, Lenka Pravdova, Simon Rerucha, Ondrej Cip, Radan Slavik, Libor Marecek, Pavel Skoda, Michal Hazlinsky

Proceedings Volume 11128, 1112806 (2019) https://doi.org/10.1117/12.2529713

KEYWORDS: Remote sensing, Time metrology, L band, Optical fibers, Optical amplifiers, Signal attenuation, Wavelength division multiplexing, S band, Modulation, Single mode fibers, Fiber amplifiers, Dense wavelength division multiplexing

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Proceedings Article | 18 December 2018 Paper

Paper

Optical amplification for quantum sources of ultra-stable optical frequency

Josef Vojtech, Ondrej Havlis, Martin Slapak, Jan Radil, Petr Munster, Tomas Horvath, Lada Altmannova, Radek Velc, Jan Kundrat, Rudolf Vohnout, Pavel Skoda, Michal Altmann, Vladimir Smotlacha, Michal Hazlinsky, Ondrej Cip, Martin Cizek, Jan Hrabina, Lenka Pravdova, Vaclav Hucl, Simon Rerucha

Proceedings Volume 10976, 109760Q (2018) https://doi.org/10.1117/12.2513641

KEYWORDS: Optical amplifiers, Fiber amplifiers, Data transmission, Interference (communication), Photons, Semiconductor optical amplifiers, Quantum optics, S band

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Proceedings Article | 18 September 2018 Paper

Paper

Multi-purpose infrastructure for dissemination of precise stable optical frequency

Josef Vojtech, Ondrej Havlis, Martin Slapak, Radek Velc, Petr Munster, Tomas Horvath, Jan Kundrat, Vladimir Smotlacha, Jan Hrabina, Martin Cizek, Lenka Pravdova, Simon Rerucha, Ondrej Cip, Radan Slavik, Rudolf Vohnout, Jan Radil, Pavel Skoda, Lada Altmannova, Michal Altmann, Michal Hazlinsky

Proceedings Volume 10765, 1076507 (2018) https://doi.org/10.1117/12.2321333

KEYWORDS: Optical amplifiers, Optical fibers, Optical filters, Data transmission, Wavelength division multiplexing, Reflection

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Proceedings Article | 23 August 2017 Paper

Paper

Optical stabilization for time transfer infrastructure

Josef Vojtech, Michal Altmann, Pavel Skoda, Tomas Horvath, Martin Slapak, Vladimir Smotlacha, Ondrej Havlis, Petr Munster, Jan Radil, Jan Kundrat, Lada Altmannova, Radek Velc, Miloslav Hula, Rudolf Vohnout

Proceedings Volume 10373, 1037310 (2017) https://doi.org/10.1117/12.2274815

KEYWORDS: Dense wavelength division multiplexing, Coarse wavelength division multiplexing, Free space optics, Wavelength division multiplexing, Optical networks, Dispersion

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Proceedings Article | 16 May 2017 Paper

Paper

Simultaneous transmission of standard data, precise time, stable frequency and sensing signals and their possible interaction

P. Munster, T. Horvath, O. Havlis, J. Vojtech, J. Radil, R. Velc, E. Skaljo

Proceedings Volume 10231, 102312A (2017) https://doi.org/10.1117/12.2266240

KEYWORDS: Optical amplifiers, Optical fibers, Optical networks, Nonlinear optics, Bragg cells, Polarization, Wavelength division multiplexing, Digital signal processing, Sensors, Fiber optics sensors, Modulation, Transmittance, Reflectometry, Data transmission, Dispersion, Photons, Interference (communication), Optical sensors

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SPIE Journal Paper | 6 February 2017 Open Access

Open Access

Joint accurate time and stable frequency distribution infrastructure sharing fiber footprint with research network

Josef Vojtech, Martin Slapak, Pavel Skoda, Jan Radil, Ondrej Havlis, Michal Altmann, Petr Munster, Radek Velc, Jan Kundrat, Lada Altmannova, Rudolf Vohnout, Tomas Horvath, Miloslav Hula, Vladimir Smotlacha, Martin Cizek, Lenka Pravdova, Simon Rerucha, Jan Hrabina, Ondrej Cip

OE, Vol. 56, Issue 02, 027101, (February 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.2.027101

KEYWORDS: Bragg cells, Picosecond phenomena, Optical amplifiers, Fiber amplifiers, Wavelength division multiplexing, Optical fibers, Transmitters, Optical engineering, Calibration, Fiber Bragg gratings

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Proceedings Article | 19 September 2016 Presentation + Paper

Presentation + Paper

Joint accurate time and stable frequency distribution infrastructure sharing fiber footprint with research network

Josef Vojtech, Martin Slapak, Pavel Skoda, Jan Radil, Ondrej Havlis, Michal Altmann, Petr Munster, Vladimir Smotlacha, Jan Kundrat, Radek Velc, Lada Altmannova, Miloslav Hula

Proceedings Volume 9977, 99770F (2016) https://doi.org/10.1117/12.2237205

KEYWORDS: Atmospheric propagation, Data transmission, Wavelength division multiplexing, Picosecond phenomena, Optical amplifiers, Transmitters, Refractive index, Wave propagation, Geodesy, Astronomy

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Showing 5 of 19 publications

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