Mr. Lukas Hajek Profile

Lukas Hajek

at VŠB-Technical Univ of Ostrava

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Publications (22)

Proceedings Article | 2 July 2019 Open Access

The company at university laboratory like efficient means for training of future engineers

Vladimir Vasinek, Vladimira Rasnerova, Lukas Hajek, Jan Latal

Proceedings Volume 11143, 111431X (2019) https://doi.org/10.1117/12.2523894

KEYWORDS: Fiber optics sensors, Photonics, Fiber optics, Sensors, Optical fibers, Optical communications, Education and training, Safety, Fiber optics tests, Magnetism

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Proceedings Article | 1 December 2017 Paper

The behavior of the geometrical parameters of optical beam of optical passive components under the long time thermal load

Frantisek Perecar, Jan Latal, Lukas Bednarek, Lukas Hajek, David Hruby, Vladimir Vasinek, Jan Nedoma, Jakub Jaros

Proceedings Volume 10603, 106030S (2017) https://doi.org/10.1117/12.2292422

KEYWORDS: Geometrical optics, Fiber couplers

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Proceedings Article | 27 April 2017 Paper

The influence of temperature loading on the optical fiber passive components

Frantisek Perecar, Lukas Bednarek, Lukas Hajek, Jakub Jaros, Marcel Fajkus, Ales Vanderka, Jan Nedoma, Vladimir Vasinek

Proceedings Volume 10208, 1020812 (2017) https://doi.org/10.1117/12.2262425

KEYWORDS: Temperature metrology, Optical fibers, Optical networks, Optical components, Applied research, Safety, Environmental sensing, Light sources, Modulators, Spectrometers, Single mode fibers, Distance measurement, Fiber lasers, Cladding, Optical testing, Optical filters

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Proceedings Article | 23 December 2016 Paper

Design of an all-fiber erbium-doped laser system for simulating power load in backbone networks

Radek Pobořil, Lukáš Bednárek, Aleš Vanderka, Lukáš Hájek, Ondřej Zbořil, Vladimír Vašinek

Proceedings Volume 10142, 101421W (2016) https://doi.org/10.1117/12.2263335

KEYWORDS: Laser systems engineering, Optical simulations, Erbium, Fiber lasers, Optical amplifiers, Optical fibers, Absorption, Optical isolators, Erbium lasers, Wavelength division multiplexing

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Proceedings Article | 23 December 2016 Paper

Simulation of turbulences and fog effects on the free space optical link inside of experimental box

Jan Latal, Jan Vitasek, Lukas Hajek, Ales Vanderka, Petr Koudelka, Stanislav Kepak, Vladimir Vasinek

Proceedings Volume 10142, 101421O (2016) https://doi.org/10.1117/12.2257443

KEYWORDS: Fiber optic gyroscopes, Free space optics, Signal attenuation, Turbulence, Atmospheric optics, Fluctuations and noise, Thermal effects, Sensors, Distance measurement, Velocity measurements

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Proceedings Article | 23 December 2016 Paper

Influence of load by high power on the optical coupler

Lukas Bednarek, Radek Poboril, Ales Vanderka, Lukas Hajek, Jan Nedoma, Vladimir Vasinek

Proceedings Volume 10142, 1014218 (2016) https://doi.org/10.1117/12.2256824

KEYWORDS: Optical amplifiers, Laser optics, Optical components, Fiber amplifiers, Fiber lasers, Optical testing, Optical fibers, Erbium, Sensors, Time metrology

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Proceedings Article | 23 December 2016 Paper

Measurement of the optical fiber numeric aperture exposed to thermal and radiation aging

Ales Vanderka, Lukas Bednarek, Lukas Hajek, Jan Latal, Radek Poboril, Petr Zavodny, Vladimir Vasinek

Proceedings Volume 10142, 1014224 (2016) https://doi.org/10.1117/12.2257339

KEYWORDS: Optical fibers, Gamma radiation, Sensors, Cladding, LabVIEW, Optical testing, Multimode fibers, Signal attenuation, Refractive index, Telecommunications

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Proceedings Article | 19 September 2016 Paper

Testing FSO WDM communication system in simulation software optiwave OptiSystem in different atmospheric environments

Ales Vanderka, Lukas Hajek, Lukas Bednarek, Jan Latal, Jan Vitasek, Stanislav Hejduk, Vladimir Vasinek

Proceedings Volume 9979, 997914 (2016) https://doi.org/10.1117/12.2237903

KEYWORDS: Free space optics, Wavelength division multiplexing, Modulation, Signal to noise ratio, Telecommunications, Quadrature amplitude modulation, Signal attenuation, Phase shift keying, Head, Eye

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Proceedings Article | 19 September 2016 Paper

Optical intensity scintillation in the simulated atmospherical environment

Lukas Hajek, Jan Latal, Ales Vanderka, Jan Vitasek, Marian Bojko, Lukas Bednarek, Vladimir Vasinek

Proceedings Volume 9979, 997915 (2016) https://doi.org/10.1117/12.2237969

KEYWORDS: Atmospheric optics, Refractive index, Sensors, Receivers, Scintillation, Free space optics, Turbulence, Mathematical modeling, Data modeling, Atmospheric scintillation

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Proceedings Article | 7 September 2016 Paper

The influence of thermal aging on the optical coupler

Lukas Bednarek, Lukas Hajek, Ales Vanderka, Jan Nedoma, Marcel Fajkus, Ondrej Zboril, Vladimir Vasinek

Proceedings Volume 9958, 99580X (2016) https://doi.org/10.1117/12.2236294

KEYWORDS: Thermography, Optical components, Optical testing, Temperature metrology, Time metrology, Error analysis, Signal attenuation, Optical fibers, Sensors, Optical sensors

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Proceedings Article | 4 September 2015 Paper

Statistical prediction of the atmospheric behavior for free space optical link

Lukas Hajek, Jan Vitasek, Ales Vanderka, Jan Latal, Frantisek Perecar, Vladimir Vasinek

Proceedings Volume 9614, 96140V (2015) https://doi.org/10.1117/12.2180338

KEYWORDS: Free space optics, Solar radiation models, Statistical analysis, Atmospheric optics, Refractive index, Data modeling, Atmospheric modeling, Signal attenuation, Head, Mathematical modeling

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Proceedings Article | 4 September 2015 Paper

Testing resistance modulation formats for FSO communication in turbulent environment, with used simulation box

Ales Vanderka, Lukas Hajek, Jan Latal, Jan Vitasek, Stanislav Hejduk, Vladimir Vasinek

Proceedings Volume 9614, 96140S (2015) https://doi.org/10.1117/12.2180335

KEYWORDS: Eye, Modulation, Fiber optic gyroscopes, Free space optics, Signal attenuation, Fluctuations and noise, Phase shift keying, Receivers, Semiconductor lasers, Atmospheric modeling

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Proceedings Article | 26 August 2015 Paper

The impacts of ageing effects due to radiation burden on optical fiber couplers

F. Perecar, O. Marcinka, L. Bednarek, M. Lucki, A. Liner, L. Hajek, M. Papes, J. Jaros, V. Vasinek

Proceedings Volume 9586, 95860E (2015) https://doi.org/10.1117/12.2187517

KEYWORDS: Optical fibers, Gamma radiation, Radiation effects, Optical components, Cladding, Optical networks, Nickel, Optical filters, Coating, Fiber lasers

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The paper discuss about accelerated ageing of optical fiber elements in their burdened with gamma radiation. In addition to the destruction of coating materials, gamma radiation has its effect on the internal structure of the optical fiber. It is necessary to specify the changes in the optical coupler and find out why these changes occur.

This article contains experimental measurement of the impact of gamma radiation Cobalt-60 on the optical couplers of various split performance ratio. The couplers were exposed to gradually increasing doses of 60Co. Measurements are focused on the overall distribution of the energy in the core and cladding various branches of SM optical fiber couplers. This article focuses on applied research and experimental development of resources for safety operation of optical networks since monitoring of ageing substantially contributes to its security. It addresses issues of accelerated ageing of optical fiber elements in their burdened with gamma radiation. How does radiation energy of gamma radiation influence optical network elements? This effect is explored just very little bit and is yet another unanswered question. In addition to the destruction of coating materials, gamma radiation has its effect on the internal structure of the optical fiber. It is necessary to specify the changes in the optical coupler and find out why these changes occur. This article contains experimental measurement of the impact of gamma radiation Cobalt-60 on the optical couplers of various split performance ratio. Optical passive components, couplers, were exposed to gradually increasing doses of ⁶⁰Co. Measurements are focused on the overall distribution of the energy of LP₀₁ mode in the core and cladding various branches of SM optical fiber couplers. Graphical and mathematical detect changes in the dissemination of energy coupler after single doses of gamma radiation are useful to understand the phenomenon of accelerated ageing elements of optical networks in environments with an increased incidence of radiation energy. Keywords: 2-D view, 3-D view, coupler, gamma radiation, Cobalt-60, ageing, energy

Proceedings Article | 26 August 2015 Paper

The aging process of optical couplers by gamma irradiation

Lukas Bednarek, Ondrej Marcinka, Frantisek Perecar, Martin Papes, Lukas Hajek, Jan Nedoma, Vladimir Vasinek

Proceedings Volume 9586, 958613 (2015) https://doi.org/10.1117/12.2187044

KEYWORDS: Signal attenuation, Gamma radiation, Artificial intelligence, Optical components, Optical testing, Optical fibers, Sensors, Crystals, Multiplexers, Optical communications

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Proceedings Article | 29 July 2015 Paper

Influence of gamma radiation on optical fibers and devices

Vladimir Vasinek, Lukas Hajek, Lukas Bednarek, Ales Vanderka, Tomas Hlavinka, Ondrej Marcinka

Proceedings Volume 9659, 965913 (2015) https://doi.org/10.1117/12.2196372

KEYWORDS: Signal attenuation, Optical fibers, Gamma radiation, Temperature metrology, Breakout cables, Fiber optics sensors, Fiber optics, Telecommunications, Fiber optic communications, Environmental sensing

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Proceedings Article | 29 July 2015 Paper

Novel optical fiber design for DTS measurement purposes

Petr Siska, Lukas Hajek, Vladimir Vasinek, Petr Koudelka, Jan Latal

Proceedings Volume 9659, 96591O (2015) https://doi.org/10.1117/12.2196296

KEYWORDS: Multimode fibers, Optical fibers, Refractive index, Optical design, Temperature metrology, Fiber optic communications, Optical communications, Raman scattering, Raman spectroscopy, Sensors

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Proceedings Article | 29 July 2015 Paper

Measurement of turbulences influence on the laser beam polarization state

Jan Latal, Jan Vitasek, Lukas Hajek, Petr Koudelka, Petr Siska, Stanislav Hejduk, Ales Vanderka, Vladimir Vasinek

Proceedings Volume 9659, 96591L (2015) https://doi.org/10.1117/12.2196261

KEYWORDS: Polarization, Turbulence, Free space optics, Polarimetry, Optical spheres, Optical simulations, Networks, Atmospheric optics, Thermography, Jones vectors

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Proceedings Article | 7 February 2015 Paper

Software design of segment optical transmitter for indoor free-space optical networks

Jan Latal, Jan Vitasek, Petr Koudelka, Petr Siska, Andrej Liner, Lukas Hajek, Ales Vanderka, Vladimir Vasinek, Michal Lucki

Proceedings Volume 9387, 93870Y (2015) https://doi.org/10.1117/12.2087118

KEYWORDS: Transmitters, Free space optics, Optical networks, Adaptive optics, Free space, Optical design, Eye, Telecommunications, Safety, Standards development

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Proceedings Article | 7 February 2015 Paper

Software design of optical link for indoor wireless optical communication network used LEDs as source visible light communication

Andrej Liner, Martin Papes, Jakub Jaros, Petr Koudelka, Jan Latal, Jan Vitasek, Lukas Hajek, Vladimir Vasinek

Proceedings Volume 9387, 938710 (2015) https://doi.org/10.1117/12.2087120

KEYWORDS: Light emitting diodes, Channel projecting optics, Optical communications, Optical networks, Visible radiation, Transmitters, Optical design, Light sources and illumination, Receivers, Wireless communications

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Proceedings Article | 7 February 2015 Paper

RFoG deployment into the next-generation networks

Petr Siska, Tomas Hlavinka, Petr Koudelka, Jan Latal, Jan Vitasek, Lukas Hajek, Radek Poboril

Proceedings Volume 9388, 93880R (2015) https://doi.org/10.1117/12.2087121

KEYWORDS: Network architectures, Networks, Image quality, Passive optical networks, Electronic filtering, Optical amplifiers, Signal attenuation, Optical networks, Receivers, Video

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Proceedings Article | 6 January 2015 Paper

New approach to design of optical transmitter for indoor free space optical network

Jan Latal, Petr Koudelka, Jan Vitasek, Lukas Hajek, Stanislav Hejduk, Andrej Liner, Petr Siska, Vladimir Vasinek

Proceedings Volume 9450, 94501D (2015) https://doi.org/10.1117/12.2073495

KEYWORDS: Free space optics, Transmitters, Adaptive optics, Optical design, Telecommunications, Free space, Optical networks, Light emitting diodes, Free space optical communications, Geometrical optics

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Proceedings Article | 6 January 2015 Paper

Security risk assessment of the primary layer of wavelength division multiplexing passive optical network

Petr Koudelka, Petr Siska, Jan Latal, Radek Poboril, Lukas Hajek, Stanislav Kepak, Vladimir Vasinek

Proceedings Volume 9450, 94500U (2015) https://doi.org/10.1117/12.2070468

KEYWORDS: WDM-PON, Network security, Phased array optics, Passive optical networks, Networks, Wavelength division multiplexing, Optical networks, Time division multiplexing, Computer security, Channel projecting optics

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Showing 5 of 22 publications

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