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New trends in fibre optic sommunications
Lubajo, Lubajo Moses Wolyan ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
Přenos optickych vláken je jednou z hlavních metod přenosu informací pro přenos na velké vzdálenosti. Byly vyvinuty různé modulační formáty pro maximalizaci informací přenášenych prostřednictvím komunikačního kanálu. Takové formáty sahají od formátů, které přenášejí jeden bit na symbol (jako je například binární fázové posunování klíčů, BPSK), a nebo vice, jako je například Kvadraturní fázové posunovací klíčování, duální polarizační kvadraturní fázové řazení a mnoho dalších ostatní modulace. Cílem diplomové práce je vytvořit a implementovat přenosovy systém s rychlostí 100 Gbps pomocí modulace formátu DP QPSK. Vysledky jsou shrnuty s ohledem na to, co bylo úspěšně implementováno, a zlepšení, která mohou byt ještě učiněna pro zvyšení přenosové vzdálenosti a snížení BER mimo jiné. Použitysimulační software je PHOTOSS.
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Experiments in optics for secondary school
Machalická, Jana ; Kácovský, Petr (advisor) ; Snětinová, Marie (referee)
Title: Experiments in optics for secondary school Author: Jana Machalická Department: Department of Physics Education Supervisor: Mgr. Petr Kácovský, Department of Physics Education Abstract: Within the frame of this thesis has created 12 structured instruction for physical experiments in optics usable in secondary schools teaching. These experiments can be divided into chapters Geometrical optics and Physical optics. Crucial for the creation of this work was repeated testing of experiments to enrich the instructions of the technical notes and recommendations for the preparation and execution. All instructions will be gradually available on the electronic collection of physics experiments which is developed by Department of Physics Education FMP CU. The work also includes classification of experiments and a brief overview of the available materials, printed and electronic, which deal with physical experiments in optics. Keywords: Physics experiment, electronic collection, geometrical optics, physical optics.
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Simulations of spacecraft measurements of electromagnetic waves in the Earth's magnetosphere
Hanzelka, Miroslav ; Santolík, Ondřej (advisor) ; Kolmašová, Ivana (referee)
For more than fifty years simulations of electromagnetic (EM) wave propa- gation are used to study the Earth's magnetosphere and to analyze EM emissions observed by spacecraft. In this work we focus on the propagation of EM waves in the frequency range from 100 Hz to 10 000 Hz within the region of the inner magnetosphere. We use a numerical procedure which performs ray tracing simu- lations and finds the wave trajectory along with other wave properties. Using these simulations we study propagation properties of equatorial noise emissions. Another subject of this work is development of a propagation scheme explaining a conjugate observation of quasiperiodic emissions by the Van Allen Probe A (VAP-A) spacecraft and the ground station in Athabasca. In this case we make use of a density distribution model based on measurements of plasmaspheric electron density done by the EMFISIS instrument onboard VAP-A. 1
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New trends in fibre optic sommunications
Lubajo, Lubajo Moses Wolyan ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
Přenos optickych vláken je jednou z hlavních metod přenosu informací pro přenos na velké vzdálenosti. Byly vyvinuty různé modulační formáty pro maximalizaci informací přenášenych prostřednictvím komunikačního kanálu. Takové formáty sahají od formátů, které přenášejí jeden bit na symbol (jako je například binární fázové posunování klíčů, BPSK), a nebo vice, jako je například Kvadraturní fázové posunovací klíčování, duální polarizační kvadraturní fázové řazení a mnoho dalších ostatní modulace. Cílem diplomové práce je vytvořit a implementovat přenosovy systém s rychlostí 100 Gbps pomocí modulace formátu DP QPSK. Vysledky jsou shrnuty s ohledem na to, co bylo úspěšně implementováno, a zlepšení, která mohou byt ještě učiněna pro zvyšení přenosové vzdálenosti a snížení BER mimo jiné. Použitysimulační software je PHOTOSS.
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Experiments from geometrical optics for teaching at primary and secondary school
Hložek, Filip ; Houfková, Jitka (advisor) ; Gottwald, Stanislav (referee)
Title: Experiments from geometrical optics for teaching at primary and secondary school Author: Ing. Filip Hložek Department: Department of Physics Education Supervisor: RNDr. Jitka Houfková, Ph.D., Department of Physics Education Abstract: This work is focused on experiments in geometric optics. There is a research of textbooks for primary and secondary schools, that deals with this topic of physics. Most of the work is dedicated to the proposed manuals for experiments for the excercise of geometric optics in Practical Course in School Experiments I. The manuals were tested with several groups of students at Practical Course. The test results are briefly summarized here, including several adjustments of the manuals that has risen from it. The work also deals with mirror telescopes, aberrations, and the production of models of two telescopes - Newtonian and Cassegrain printed on a 3D printer. The models are then used in two experiments for Practical Course. Keywords: experiments, geometrical optics, optical instruments
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Simulations of spacecraft measurements of electromagnetic waves in the Earth's magnetosphere
Hanzelka, Miroslav ; Santolík, Ondřej (advisor) ; Kolmašová, Ivana (referee)
For more than fifty years simulations of electromagnetic (EM) wave propa- gation are used to study the Earth's magnetosphere and to analyze EM emissions observed by spacecraft. In this work we focus on the propagation of EM waves in the frequency range from 100 Hz to 10 000 Hz within the region of the inner magnetosphere. We use a numerical procedure which performs ray tracing simu- lations and finds the wave trajectory along with other wave properties. Using these simulations we study propagation properties of equatorial noise emissions. Another subject of this work is development of a propagation scheme explaining a conjugate observation of quasiperiodic emissions by the Van Allen Probe A (VAP-A) spacecraft and the ground station in Athabasca. In this case we make use of a density distribution model based on measurements of plasmaspheric electron density done by the EMFISIS instrument onboard VAP-A. 1
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Experiments in optics for secondary school
Machalická, Jana ; Kácovský, Petr (advisor) ; Snětinová, Marie (referee)
Title: Experiments in optics for secondary school Author: Jana Machalická Department: Department of Physics Education Supervisor: Mgr. Petr Kácovský, Department of Physics Education Abstract: Within the frame of this thesis has created 12 structured instruction for physical experiments in optics usable in secondary schools teaching. These experiments can be divided into chapters Geometrical optics and Physical optics. Crucial for the creation of this work was repeated testing of experiments to enrich the instructions of the technical notes and recommendations for the preparation and execution. All instructions will be gradually available on the electronic collection of physics experiments which is developed by Department of Physics Education FMP CU. The work also includes classification of experiments and a brief overview of the available materials, printed and electronic, which deal with physical experiments in optics. Keywords: Physics experiment, electronic collection, geometrical optics, physical optics.
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Ray-tracing simulations of electromagnetic waves in magnetospheric plasmas
Nečada, Marek ; Santolík, Ondřej (advisor) ; Kouba, Daniel (referee)
This work deals with simulations of wave propagation in magnetospheric plasmas, particularly with numerical ray tracing. It mentions some of the earlier ray tracing implementations that were used in studies of wave propagation in Earth's magnetosphere. The most important parts of linear plasma wave theory are outlined. Some of the existing numerical methods for solving the hot plasma dispersion relation are described. A new ray tracing program, NPR, is presented. It is capable of ray-tracing simulations in cold plasmas and also in non-relativistic hot plasmas via the WHAMP procedure.
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