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Laser transmitter with fiber
Hašek, Jaroslav ; Němeček, Jiří (referee) ; Wilfert, Otakar (advisor)
This master´s thesis deals with communication which is provided by optical devices. Optical wireless links are enforced due to high bit rate, responsibility and noise immunity. Main part of this master´s project is devoted to optical fibre, its characteristic and its usage in laser transmitter.
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The audit methology of optical networks
Štěpán, Petr ; Münster, Petr (referee) ; Reichert, Pavel (advisor)
This work deals with summary of optical system audit in the terms of all layer of the reference model ISO/OSI. Introduction of the work focuses on exploring issues of management networks control, the description of ISO/OSI model and explanation of the terms QoS and SLAs. The description of the optical fiber transmission follows after that. The characteristics of the waveguide and optical communication system components with regard to its reliable operation and management are analyzed. Some major types of optical networks are described. Following section contains a description of methods used in the audit, further the methods for measuring physical, connection and network layer of the reference model are discussed more thoroughly. The work also contains a partial analysis of the audit of the physical layer of the selected section of the Brno academic network optical line. Of all these methods for networks control the final audit report for the optical network with selected limits is compiled as a conclusion of the work.
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Model of the Surface Optical Intensity Distribution in the Beam
Wintr, Aleš ; Hudcová, Lucie (referee) ; Wilfert, Otakar (advisor)
The aim of the thesis is first to describe the light beam spreading through free space and its characteristics. The theoretical part of the thesis developed programs that display models of beams. Given the parameters, theses models depict areal dispersion of optical intensity in the cross-section of beams. More specifically, I developed both a 2-dimensional and 3-dimensional model of beam depiction and a 3-dimensional model with variable angle of rotation of the beam trace. For this purpose I used the software Matlab R2007a. In the experimental part of the thesis I assembled a measurement chain and measured optical intensity of selected optical fibre. The measurement chain included laser Promax Prolite 80, optical source LED Promax Prolite 81, optic power meter Exfo 67A, collimator Thorlabs F810FC-1550 and optical fibres with various characteristics. The measured values were used to plot graphs depicting aerial dispersion of optical intensity and these graphs were compared with the theoretical computer model developed in the theoretical part of the thesis.
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Topology for next generation access networks
Kovář, Adam ; Sládok, Ondřej (referee) ; Grenar, David (advisor)
This thesis consists of basic requirements, application of optical fibres and final simulation of this network in specific location. This template shows ideal construction of optical fibre network for this specific location and also displays expected price of building this kind of network. In this thesis will be described this location and its problematic parts which can have critical impact on building of this network. As a part of design of this network we chose optical fibre and technology for protection of optical fibres. All of these items are collected and we can see approximate price. This thesis shows how the customer will be connected to network and also to this thesis is attached the map which shows exact position of the network. Simulation will prove networks stability and shows delay which can occur during using basic and expected applications on network.
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Design of EMC optical converter
Štěpánek, Adam ; Hruboš, Zdeněk (referee) ; Krutílek, David (advisor)
Master's thesis is focused on designing optical converter for EMC measurement transfering signal through noisy enviroment. First part contains analysis of electromagnetic interference and its coupling and measurement, especially types of probes for interference maesurement. Next part passing through designing of optoelectric and electrooptic converter with digital intensity modulation. Last part is about realization of optical converter.
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The Optical Fibre Dispersion Effects on Multiplex Transmission Systems
Kyselák, Martin ; Filka, Miloslav (advisor)
This doctoral thesis deals with present trend to turn up the bit rate of the optical fibres making use of wavelenght multiplex systems. There are new theoretical and practical problems caused by the new technologies. Except the known modal dispersion there exist problems caused by chromatical and polarization mode dispersion. In the opening of the thesis the known effects, which influence the payload signal, are introduced. The polarization mode dispersion has the main attention. Within the scope of this thesis there has been programmed the statistical calculator which can analyses the measured values of differential group delay by Monte Carlo calculation. Next meaningful output is the designating application of the optical routes. It is possible to mathematicaly unambiguously define the polarization mode dispersion by Jones, Stokes and Poynting vectors. This complicated calculations are mechanized and in the simulation application make possible to simulate the signification of the PMD influence at different input parameters. The thesis includes the study of the PMD modulation format impact with the results of simulations and confrontation with other scientists results. The significant output are the final practical results examinations, which can be implemented thanks to the possibility of using the FTB-5500B measuring device.
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GUI for the processing of measurements from the optical reflectometer
Vitek, Vojtech ; Jurčík, Michal (referee) ; Münster, Petr (advisor)
This diploma thesis is focused on realisation of the application, that process and display measured data from OTDR device. The first section describes optical fibers, transmission characteristics of fibers and measurement methods of the attenuation on optical path. The second section describes the principle of the OTDR method and measured events on optical path. Final part is dedicated to realisation of the appication by the assignment.
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Optical fiber as a distributed temperature sensor
Vošček, Jakub ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
The financial requirements between fiber optic sensors and conventional sensors are gradually declining, which, despite many advatages and wide range of applicationas, has slowed down the demand for these sensors. With the demand for fiber optic sensors also grow the requirements for the parameters of these sensors. This thesis deals with distributed temperature fiber optic sensors. Non--linear phenomen in optical fibers, such as Raman scattering is used for measuring with these sensors. This scatterin was used to obtain information about temperature, which effected the optical cable under the test.
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The combined structures in optical fiber
Klvaňa, Jakub ; Čučka, Milan (referee) ; Urban, František (advisor)
The aim of this master’s thesis is familiar with the problems of optical fibers and possi- bilities creating functional optical structures in optical fibers. first section focuses on the optical fibers and their properties. Another chapter deals with the functional structures of optical fiber and their production. Next section is devoted to the analysis of combinations of these functional structures and their potential applications in sensors. Subsequently, a combined structure is proposed, which is later produced, measured and evaluated for possible use in the sensors
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