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POF - Polymer optical fibers
Janovský, Marek ; Šifta, Radim (referee) ; Filka, Miloslav (advisor)
This document informs readers with polymer optical fibres (POF). The first section summarizes basic properties and differences between polymer and glass optical fibres. The second section contains list of POF types, their differences in the structure and refractive indexes. Further is described preparation of fibre surface for connector pin and connector types, which are used for POF. Next section contains usage of POF in access networks, types of access networks and FTTx network types. The document continues design of FTTH, FTTB and LAN for home application. The practical part deals with basic measurements with POF, production of coupler and measuring response at test ranges. The final section summarizes the overall findings and results.
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The utilization of POF in access networks
Doležal, Ondřej ; Šporik, Jan (referee) ; Filka, Miloslav (advisor)
In this work, the reader familiares with plastic optical fiber (POF). Firstly are mentioned the basics of the optical transmission. Then there are the main features and parameters POF and a historical overview, detailed description of the types of POF, their important strengths and weaknesses, comparison with glass fiber, installation, available POF connectors and procedure of measurements and a summary of key findings from the practice, including a description of existing experiments and projects. The second part focuses on the use of POF in access networks. There are described present trends in access networks, an overview of optical access networks and explaination the concept with the inclusion of POF in optical networks (FTTX). Furthermore, there are possibilities of POF fibers in segment of local networks and their readiness for advanced network services, such as IPTV. The penultimate chapter contains design test polygon and final part summarizes all findings and results of this work.
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Experimental work with POF - Polymer optical fibers
Doležal, Ondřej ; Urban, František (referee) ; Filka, Miloslav (advisor)
In this diploma thesis, the reader is familiarized with polymer optical fiber (POF). Firstly is mentioned theoretical background of optical fibers and optical transmission. The following are the basic properties and significant parameters of POF, a more detailed description of each type POF and their essential advantages and disadvantages in comparison with established optical fibers based on glass. The next chapter describes the area of practical issues: working with fibers and fiber installation, as well as the available connectors and methods of measurement of POF. Closely are analyzed knowledge of the practice, including the utilize in the aerospace and automotive industries, as well as in industrial networks, access data networks and local area networks. The practical part includes the measurement of basic transmission and mechanical parameters, including analysis of the results. The conclusion summarizes all the findings and results of this work, including possible future developments.
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Polymer optical fibers - POF
Mitrič, Martin ; Dostál, Otto (referee) ; Filka, Miloslav (advisor)
Polymer Optical Fibers - POF in recent years reach into values attenuation about 10 dB • km-1. This is the value that makes these fibers applicable for data transmissions over short distances. Between the great advantages of these fibers include simple installation and easy preparation of the connectors. The aim of of this work is to introduce the issue of the POF fiber. The work begins with becoming familiar with different types of fiber POF, their basic characteristics and differences. It also deals with methods of linking these different types of fibers and connectors designed for these fibers. Another chapter focuses on the possible use of these fibers in FTTx networks and their future. Work continues overview of the types of optical access network and transmission design polygon using POF fibers for laboratory purposes. The final part presents the results of measurements of fundamental properties of the POF fiber.
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Standards for application of polymer optical fibres
Stiburek, Martin ; Tejkal, Vladimír (referee) ; Šporik, Jan (advisor)
The aim of thesis is description of polymer optical fiber (POF). In particular, focusing on their application and its associated standardization. After explaining the principle of signal transmission by polymer fibers, glass fibers are compared with the polymer fibers. The attention is then paid to the types of POF and their connectors. Another part is engaged in standards of polymer fibers, according to their area of application. Following chapter describes the application of polymer fibers in practice, especially in the automotive industry and sensor technology. Standalone chapter is dedicated to deploying POF fibers in LANs. It mentions comparasion with copper and wireless networks, summarizes the advantages and disadvantages. Chapter also provides an overview of the components used in POF - optical converter, switch with optical interfaces, optical network card, etc. In the practical part is created the design of home network for two-storey family house. The proposal was implemented by CableProject CAD software, first using copper cabling (UTP category 5e) and then using polymer fibers. Finally, both proposals are compared with each other. It has been made detailed financial analysis, compared performance of instalation and methods of cable instalallation. The practical part is also dedicated to measuring the parameters of POF networks, the impact of the attenuation loss, explores methods of joining glass and polymer fibers and is engaged in IPTV transmission simulation in real conditions.
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POF - polymer optical fibres
Mikulec, Matěj ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
This work focuses on polymer optical fiber (POF). It describes basic properties of polymer optical fibers, materials for production and methods of manufacturing processes. In following chapters are given individual fibers that vary different refractive indexes and diameter of fiber. Also there are analyse connectors which are used for joining. As very suitable solution for home installation seems to be using the system Optolock without connectors. In the work is also written several areas where it is possible to use the POF. It can break through in automotive industry, home networks or as a sensor. The practical part contains measuring polygon draft and FTTH proposal using POF for distribution system in the house, where P2P topology is choosen. It´s also made a proposal for distribution of POF in the apartment. For installation in the apartment prices of network components are compared between POF distribution and UTP cat.6 cabling. UTP cat.6 is in this comparison many times more cheaply. Final chapter evaluate demands on work with POF fibers. Describes preparation of fiber before communication and creation of small experimental network. Important findings of the work are summarized in the conclusion.
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The effects of epigenetic factor PRDM9 on the fertility of rodent females
Gašić, Srdan ; Trachtulec, Zdeněk (advisor) ; Děd, Lukáš (referee) ; Fulková, Helena (referee)
The Prdm9 gene encodes a histone-3-lysine-4,36-trimethyltransferase that specifies meiotic recombination sites and guides programmed double-strand breaks (DSBs) in mice, rats, and humans. Some vertebrates lost Prdm9 but not fertility throughout evolution, while the removal of Prdm9 caused sterility in some mouse strains, such as C57BL/6 (B6). The reasons for such species-specific fertility differences are unknown. To resolve these different requirements for PRDM9 in fertility, we produced Prdm9 mutants in another mammalian species, Rattus norvegicus, strain SHR/OlaIpcv. The removal of Prdm9 function did not completely abolish fertility in rats (as in B6 mice). Here I demonstrate that the loss of rat PRDM9 delayed female meiosis and caused synapsis and DSB repair defects that lead to a significant oocyte loss. However, unlike Prdm9-deficient B6 mouse oocytes, about 10-15% of pachytene-like mutant rat oocytes synapsed their chromosomes and repaired DSBs to the levels similar to controls. Because of this, female rats lacking PRDM9 maintained some oocytes until adulthood and yielded offspring, while B6 mice lost oocytes around the time of birth. Nevertheless, the adult rat mutant oocytes were exhausted earlier than the control adult rat oocytes. Therefore, PRDM9-lacking female rats suffered from...
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POF - Polymer optical fibers
Janovský, Marek ; Šifta, Radim (referee) ; Filka, Miloslav (advisor)
This document informs readers with polymer optical fibres (POF). The first section summarizes basic properties and differences between polymer and glass optical fibres. The second section contains list of POF types, their differences in the structure and refractive indexes. Further is described preparation of fibre surface for connector pin and connector types, which are used for POF. Next section contains usage of POF in access networks, types of access networks and FTTx network types. The document continues design of FTTH, FTTB and LAN for home application. The practical part deals with basic measurements with POF, production of coupler and measuring response at test ranges. The final section summarizes the overall findings and results.
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