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Organic semiconductors properties
Kočer, Martin ; Vaněk, Jiří (referee) ; Špinka, Jiří (advisor)
This diploma thesis deals with optical properties of organic semiconductors and measuring method of absorption edge. Project is focused on absorption of light in organic semiconductors. This work also describes device for measuring of absorption edge.
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Parameters of FTTx networks - Quality of services
Winkler, Aleš ; Reichert, Pavel (referee) ; Münster, Petr (advisor)
The main subject of this diploma thesis is to make a proposal to improve the optical access network for the transmission of Triple play services. I would here to the reader clarify method of proposal of optical network. There are described the kinds of optical access networks with parameters, for which we must look by their construction. There are described the modern methods of construction optical network too. In the theoretical part are discussed used architecture of networks too. I met here known standards, which I compared for big importance by their choice. A reason of construction of optical network are services known like Triple play. These services together with their problems and parameters are here discussed too. At the end of theoretical part I listed here measuring method for getting negative attribute distorting the led signal. In practical part the locality witch use the optical signal as the source of information is ordered. These network use unfit connections and has less possibilities than usual and this is the reason, why is the network not able to supply Triple play in requested quality. At first the analysis of ordered network was needed. Situation was complicated by the fact, that it has been prohibited entrance to me. The structure of network and network parts was known and documented by me. I made the proposals to improve this network in practical part. By the first proposal remained original kind of access network FTTB, but used new parts with higher performance. By the second proposal I made the network FTTH, by which it was possible to use the last haul optical cables with treatment and using new elements. It was needed to create solution by flat units. The resulting proposals are here evaluated, compared and cost evaluated. For rejection of access to optical network I did not make measuring, so I made simulation for variant FTTH for getting some parameters negative acting transmission.
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Parameters of FTTx networks - Quality of services
Winkler, Aleš ; Reichert, Pavel (referee) ; Münster, Petr (advisor)
The main subject of this diploma thesis is to make a proposal to improve the optical access network for the transmission of Triple play services. I would here to the reader clarify method of proposal of optical network. There are described the kinds of optical access networks with parameters, for which we must look by their construction. There are described the modern methods of construction optical network too. In the theoretical part are discussed used architecture of networks too. I met here known standards, which I compared for big importance by their choice. A reason of construction of optical network are services known like Triple play. These services together with their problems and parameters are here discussed too. At the end of theoretical part I listed here measuring method for getting negative attribute distorting the led signal. In practical part the locality witch use the optical signal as the source of information is ordered. These network use unfit connections and has less possibilities than usual and this is the reason, why is the network not able to supply Triple play in requested quality. At first the analysis of ordered network was needed. Situation was complicated by the fact, that it has been prohibited entrance to me. The structure of network and network parts was known and documented by me. I made the proposals to improve this network in practical part. By the first proposal remained original kind of access network FTTB, but used new parts with higher performance. By the second proposal I made the network FTTH, by which it was possible to use the last haul optical cables with treatment and using new elements. It was needed to create solution by flat units. The resulting proposals are here evaluated, compared and cost evaluated. For rejection of access to optical network I did not make measuring, so I made simulation for variant FTTH for getting some parameters negative acting transmission.
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Optical spectrometer designing
Dohnal, Marek ; Křivák, Petr (referee) ; Hudcová, Lucie (advisor)
This project focuses the problems of projection and design of optical instruments being instrumental to determination of elements in various material compounds. There are described here the structures of fundamental optical instruments and their possible variants, one of which has been chosen and further entered into details. The work specifically refers to an optical spectrometer, which by its nature, ranges the bands both of visible and near-infrared radiation. The work presents basic principles of particular parts, which the existent instrument can consist of, the advantages and disadvantages brought by the single parts. For specifically proposed configuration, intentionally set in such a way it uses state-of-the art measurement methods obtaining the best possible measurement results, the work analyzes in details the method of operation and solves numerically the theoretical assumptions for correct operation of the spectrometer. A constituent of the project is an experimental measurement testifying, with certain errors, to the theoretical solutions. The measurement errors that could result from chosen arrangement and chosen measurement method are numerically expressed in a separate sub-chapter. Further various calibration methods are mentioned, based on which the calibration method used during the experimental measurement was selected. The last part of project is focused on circumferential design of the optical spectrometer, where series of suitable circumferential elements was scrutinized. For basic elements there are presented their parameters and possible troubles related to the implementation. Furthermore the realisation of project was carried out and the spectrometer was assembled with the parts available in laboratory. The results were elaborated with a computer programme created specially for this application and then compared to a professional spectrometer.
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Monocrystalic silicon - optical properties
Kahánek, Tomáš ; Vaněk, Jiří (referee) ; Špinka, Jiří (advisor)
This diploma thesis deals with optical properties of silicon. The main task of the work was to create silicon samples with ohmic contacts. Suitable radiation source was designed to measure absorption edge of monocrystalline silicon. Designed measuring station was realised. Measurements were performed on samples of p-type monocrystalline silicon provided by ON Semiconductor Rožnov. p. Radhoštěm. The absorbtion edge was measured.
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Centre-fed microstrip patch antenna
Jireček, Martin ; Láčík, Jaroslav (referee) ; Raida, Zbyněk (advisor)
Systems with extreme bandwidth are part of advanced modern systems at radio high capacitive communication. Originally this technology was intended for radar scan. Thanks to wide frequency band had radar possibility „ see" a behind crimp, e.g. behind woody partitions etc . To his noise immunity, fail safe tapping plus small wattage heftiness began use for datal systŽm function. If is elementary antenna compound from coaxial probe and shorting outlet, it is possible use to actuating separate narrow slot placed in the middle of incandescent dabs. Impedance and radiating characteristics conventionally plumbed phlobaphene antennae excited tape lead and suggested microstrip phlobaphene antennae are experimentally explored plus collated. Explored is so and effect changes slotted longitude slot on characteristics elementary antenna.
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Spectral properties of daylight as time-spatial function
Mayer, Jan ; Drápela, Jiří (referee) ; Baxant, Petr (advisor)
Graduation thesis describes basic data about Sun, suns constant, solar radiation thoroughfare by the earth's atmosphere. Thesis describes effects of components of optical radiation and physical character of solar radiation. Thesis also describes character of day lighting in nature, spectral distribution of natural lighting, average time of sunshine. The next point of thesis is description of measuring equipment Konica Minolta. In chapter measuring procedure is described measuring process of the sky radiance. Measurement analysis is mentioned in conclusion.
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Model of the metropolitan optical network
Prudík, Jiří ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
The purpose of this master’s thesis is foremost to provide a simple guide how to build elements of optical metropolitan area network. The basic model consists to sequence of construction, network topology, passive and active parts. The collection contains examples of alternative technology such as Wireless LAN with different frequency. The optical network construction based on optical cable, fibres, splices, trays, adapters, connectors and active parts for example a lot of media convertor models. After that there are demonstrating type of wavelength division multiplexer used in metropolitan area network – passive planar PCL splitter. One of the passive planar splitter are used to increase optical fibre channel. At the end of the collection a simplified examples of used measurements – optical time domain reflectometry and optical fibre transmission. Contains standard protocols or reflectogram. The conclusion of this thesis summarizes costs of FTTb (Fibre To The Building) model of optical metropolitan area network in Czech republic and future contribution for society.
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