Mr. Frantisek Perecar Profile

Frantisek Perecar

at VŠB-Technical Univ of Ostrava

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Author

Publications (13)

Proceedings Article | 1 December 2017 Paper

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

Paper

Analysis of the impact of the deposition optical fibers on the deformation measurement with a distributed system BOTDR

M. Fajkus, J. Nedoma, R. Martinek, L. Bednarek, J. Jaros, D. Hruby, F. Perecar, V. Vasinek

Proceedings Volume 10208, 102080X (2017) https://doi.org/10.1117/12.2256720

KEYWORDS: Light scattering, Acoustics, Scatter measurement, Raman scattering, Optical fibers, Fiber optics sensors, Scattering

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Proceedings Article | 27 April 2017 Paper

Paper

Influence of different encapsulation types and shapes of polydimethylsiloxane on the temperature sensitivity of the FBG

J. Nedoma, M. Fajkus, R. Martinek, M. Novak, O. Zboril, J. Jargus, K. Witas, F. Perecar, V. Vasinek

Proceedings Volume 10208, 102080U (2017) https://doi.org/10.1117/12.2256716

KEYWORDS: Prototyping, Silicon, Dielectrics, Temperature metrology, Refractive index, Fiber Bragg gratings, Fiber optics sensors, Light emitting diodes, Optical fibers, Sensors, Analytical research, Shape analysis, Liquids, Light, Spectrum analysis

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Proceedings Article | 27 April 2017 Paper

Paper

Masonry moisture measurement using the distributed temperature sensing system

David Hruby, Tomas Kajnar, Stanislav Kepak, Jakub Jaros, Jan Nedoma, Marcel Fajkus, Frantisek Perecar, Vladimir Vasinek

Proceedings Volume 10208, 1020814 (2017) https://doi.org/10.1117/12.2262511

KEYWORDS: Raman scattering, Fiber optics, Optical fibers, Sensing systems, Sensors, Temperature metrology, Distance measurement, Environmental sensing, Fiber optics sensors, Reflectometry, Temperature sensors, Nonlinear optics

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Proceedings Article | 27 April 2017 Paper

Paper

Various optical fibers fixing methods for mechanical stress measurements

Jakub Jaros, David Hruby, Vladimir Vasinek, Frantisek Perecar, Marcel Fajkus, Jan Nedoma, Tomas Kajnar

Proceedings Volume 10208, 1020813 (2017) https://doi.org/10.1117/12.2262471

KEYWORDS: Optical fibers, Scattering, Distributed computing, Sensors, Buildings, Optical testing, Fiber optics tests, Fiber optics, Light scattering, Telecommunications, Temperature metrology

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Proceedings Article | 27 April 2017 Paper

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 | 4 September 2015 Paper

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 | 26 August 2015 Paper

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

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

Paper

Temperature measurement inside metallic cables using distributed temperature system

Jakub Jaros, Martin Papes, Andrej Liner, Vladimir Vasinek, Veleslav Mach, David Hruby, Tomas Kajnar, Frantisek Perecar

Proceedings Volume 9659, 96591I (2015) https://doi.org/10.1117/12.2196115

KEYWORDS: Temperature metrology, Optical fibers, Raman scattering, Distributed computing, Raman spectroscopy, Scattering, Light scattering, Molecules, Spatial resolution, Electrical engineering

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Proceedings Article | 7 May 2015 Paper

Paper

Investigation of optical thin films printed on the surface of facets of photonic crystal fibers

M. Lucki, S. Kraus, R. Zeleny, Johann Zehetner, Dana Seyringer, J. Latal, F. Perecar

Proceedings Volume 9507, 95070A (2015) https://doi.org/10.1117/12.2182203

KEYWORDS: Thin films, Photonic crystal fibers, Laser ablation, Gold, Optical filters, Free space optics, Waveguides, Metals, Filtering (signal processing), Polarization

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Optical fibres are widely used in various applications as a medium for optical signals or optical transfer. This transport can be realized on long distance, compared to free space optics, which significantly extends reach of applications. Free space optics and fibre optics are combined in practice to yield the maximum performance of individual components forming a particular system. In such cases, light coupling from free space into fibres is required and it is frequently implemented with the use of lenses. An optical signal coupled into a fibre may also need certain modifications of spectral and spatial properties to allow its propagation down the fibre or reduce the amount of power carried in. The above requirement has been fulfilled by modifying surface of facets of photonic crystal fibres. By extrusion of a certain amount of host material from the surface, it is possible to obtain a structure resembling a thin film or an opaque layer for certain wavelengths. Several different structures of photonic crystal fibres and materials are considered to show influence of such thin-film on signal properties. This investigation is carried out in context of abilities of ablation of material from surfaces of photonic crystal fibres. Only certain shapes and geometrical arrangements can be considered. One of the goals is to specify, which of them are key for potential modification of spectral characteristics of photonic crystal fibres. The printed structures could potentially work like a thin-film ablation. Rigorous and versatile finite difference method has been employed to model propagation of light, its incidence onto a surface of the photonic crystal fibre, and subsequent propagation down the fibre. The simulations are carried on small pieces of photonic crystal fibres, with the length of tens of micrometres, due to well-known demands of the simulation technique on computational resources. Nevertheless, such a simplification is valid, since the structure is longitudinally uniform beyond the thin-film layer. However, this is aspect is not covered in the presented paper and it is our ongoing effort. Finally, the goal is to verify if the investigated structures can work as a slot waveguide.

Proceedings Article | 6 January 2015 Paper

Paper

Measurement of the temperature distribution inside the power cable using distributed temperature system

Jakub Jaros, Andrej Liner, Martin Papes, Vladimir Vasinek, Veleslav Mach, David Hruby, Tomas Kajnar, Frantisek Perecar

Proceedings Volume 9450, 94500K (2015) https://doi.org/10.1117/12.2070412

KEYWORDS: Temperature metrology, Optical fibers, Raman scattering, Distributed computing, Raman spectroscopy, Scattering, Sensors, Light scattering, Molecules, Telecommunications

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Proceedings Article | 21 May 2014 Paper

Paper

Features and range of the FSO by use of the OFDM and QAM modulation in different atmospheric conditions

Liner Andrej, Frantisek Perecar, Jakub Jaros, Martin Papes, Petr Koudelka, Jan Latal, Jakub Cubik, Vladimir Vasinek

Proceedings Volume 9103, 91030O (2014) https://doi.org/10.1117/12.2050279

KEYWORDS: Modulation, Orthogonal frequency division multiplexing, Free space optics, Quadrature amplitude modulation, Fiber optic gyroscopes, Signal attenuation, Phase shift keying, Amplitude shift keying, Receivers, Radio optics

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Showing 5 of 13 publications

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