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Wireless optical link
Haňka, Jiří ; Hudcová, Lucie (referee) ; Poliak, Juraj (advisor)
This thesis is aimed at section of transmission of digital data by using two optical wireless communications realized by two free-space optics transcievers working in full-duplex mode. Generally, the work describes present options of optical connections, their principles and comparison with other connections. Basic components of realized transmitter and receiver are mentioned with their characteristics and wirings. The work describes options of transmission and further deals with various external events, which influence characteristics of transmitted optical signal. Thesis describes the optical part of design and construction free-space optic and it’s ending energy balance of this link. Further, the work treats of basic use of ethernet technology in transmissions, coding and modulations of data transmitted by optical connection.
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Optical communication in ultra violet band
Golubev, Martin ; Hudcová, Lucie (referee) ; Poliak, Juraj (advisor)
This bachelor thesis deals with analyzing atmospheric transmission media properties and performance ratio in ultraviolet band optics beam propagating in Earth's atmosphere. In work are definited a optical phenomenons, their implications and use. Description of atmospheric transmission media analyzes the impact of individual particles in the atmosphere on optical beams. There are described a effect of ultraviolet light on living organisms. Simulations of performance ratio using Matlab and proposal of concrete link of UV NLOS for short range are serve as a basis for further research into this field of optical communications.
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Interferometric measurement of phase changes of optical beam in turbulence
Děcká, Klára ; Křivák,, Petr (referee) ; Hudcová, Lucie (advisor)
This master’s thesis deals with the impact of atmospheric turbulence on phase changes of a free space optical signal. This problematic is investigated by the interferometric method. A part of the thesis is focused on the phenomenon of atmospheric turbulence. Then the physical effect of interference is discussed and optical interferometers are described. The experimental part of the thesis is focused on measurement of phase shift of optical signal by interferometric method. The result of the thesis is to determine how phase shift of an optical beam depends on the strength of turbulence.
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Model of atmospheric transmission media for free space optics
Přikryl, Petr ; Vlček, Čestmír (referee) ; Wilfert, Otakar (advisor)
The aim of this thesis is to study the methods of a free space optical link design and its application in the communication technologies. The thesis describes possible intrusive influences on the transmitted optical signal, which are the signal noise, atmospheric attenuation and atmospheric turbulences. The thesis is particulary focused on the influence of the atmospheric turbulences and atmospheric attenuation on the optical beam.
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Low-range high-speed optical transceiver
Pučálka, Jan ; Tošovský, Petr (referee) ; Kubíček, Michal (advisor)
The diploma thesis deals with description and design of a low-cost free-space optical (FSO) link. First, general FSO theory is discussed including their common parameters, properties and topologies. Further, optical signal sources and detectors are proposed. Finally, the selected implementation is described including its design and realization. The proposed FSO consists of two identical segments (modules) to form a full-duplex link. The FSO utilizes LED as a light source, maximum speed data rate is 100 Mb/s with 100Base-TX interface.
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Method of Atmospheric Transmission Media Characteristics Determination in Optical Spectrum
Hudcová, Lucie ; Lazar, Josef (referee) ; Vlček, Čestmír (referee) ; Wilfert, Otakar (advisor)
This dissertation is focused on the determination of turbulent atmospheric transmission media properties. The concept of new method for turbulent attenuation designation is presented – the method of available power. This method comes from laser beam intensity profile analysis. The next point of this work is relative variance of optical intensity study. On the basis of experimental measurements relative variance of optical intensity is non-uniformly distributed in laser beam intensity profile. This non uniform distribution is subordinated to angular coefficient of intensity profile curve. Due to this information we can determine optimal laser beam shape to minimize influence of turbulent atmosphere.
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Interferometric measurement of phase changes of optical beam in turbulence
Děcká, Klára ; Křivák,, Petr (referee) ; Hudcová, Lucie (advisor)
This master’s thesis deals with the impact of atmospheric turbulence on phase changes of a free space optical signal. This problematic is investigated by the interferometric method. A part of the thesis is focused on the phenomenon of atmospheric turbulence. Then the physical effect of interference is discussed and optical interferometers are described. The experimental part of the thesis is focused on measurement of phase shift of optical signal by interferometric method. The result of the thesis is to determine how phase shift of an optical beam depends on the strength of turbulence.
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Wireless optical link
Haňka, Jiří ; Hudcová, Lucie (referee) ; Poliak, Juraj (advisor)
This thesis is aimed at section of transmission of digital data by using two optical wireless communications realized by two free-space optics transcievers working in full-duplex mode. Generally, the work describes present options of optical connections, their principles and comparison with other connections. Basic components of realized transmitter and receiver are mentioned with their characteristics and wirings. The work describes options of transmission and further deals with various external events, which influence characteristics of transmitted optical signal. Thesis describes the optical part of design and construction free-space optic and it’s ending energy balance of this link. Further, the work treats of basic use of ethernet technology in transmissions, coding and modulations of data transmitted by optical connection.
|
|
|
Optical communication in ultra violet band
Golubev, Martin ; Hudcová, Lucie (referee) ; Poliak, Juraj (advisor)
This bachelor thesis deals with analyzing atmospheric transmission media properties and performance ratio in ultraviolet band optics beam propagating in Earth's atmosphere. In work are definited a optical phenomenons, their implications and use. Description of atmospheric transmission media analyzes the impact of individual particles in the atmosphere on optical beams. There are described a effect of ultraviolet light on living organisms. Simulations of performance ratio using Matlab and proposal of concrete link of UV NLOS for short range are serve as a basis for further research into this field of optical communications.
|
|
|
Method of Atmospheric Transmission Media Characteristics Determination in Optical Spectrum
Hudcová, Lucie ; Lazar, Josef (referee) ; Vlček, Čestmír (referee) ; Wilfert, Otakar (advisor)
This dissertation is focused on the determination of turbulent atmospheric transmission media properties. The concept of new method for turbulent attenuation designation is presented – the method of available power. This method comes from laser beam intensity profile analysis. The next point of this work is relative variance of optical intensity study. On the basis of experimental measurements relative variance of optical intensity is non-uniformly distributed in laser beam intensity profile. This non uniform distribution is subordinated to angular coefficient of intensity profile curve. Due to this information we can determine optimal laser beam shape to minimize influence of turbulent atmosphere.
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