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Development of a method for simultaneous measurement of cathodoluminescence and topography of nanostructures
Vacek, Martin ; Klok, Pavel (referee) ; Nováček, Zdeněk (advisor)
The bachelor thesis focuses on the combined use of SPM and SEM techniques using an optical fiber used to collect cathodoluminescence radiation. The thesis contains of a section summarising the used techniques with more detailed description of the cathodoluminescence phenomenon. Following sections describe the development of the method, including the design and construction of the probe, tuning fork and optical fibre modifications. The results show that the newly developed method is capable of providing accurate and reliable results, thus contributing to the expanded capabilities of nanostructure characterization at the Institute of Physical Engineering.
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Laboratory exercises: Modulation in optical networks
Jurkovič, Martin ; Horváth, Tomáš (referee) ; Münster, Petr (advisor)
The thesis deals with the issue of optical communication systems, which are increasingly used for high-speed data transmissions. The basic principles of signal transmission over optical fibres are described. Furthermore, the techniques accompanying this transmission are outlined. In particular, the focus is on modulations, which undeniably help to increase the transmission speed of the communication. Closely related to the modulation process is the topic of optical modulators and the principle of optical signal detection, which are also included in the work. A simulation application has been created in Python on the discussed topic, the description and creation of which is summarized in the thesis. Using this application, the design of two laboratory tasks was subsequently carried out to demonstrate and help to better understand the issue of fiber optic communication.
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Fiber optic infrastructure security
Děcký, Martin ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This bachelor thesis addresses the problem of security risks of optical fiber infrastructures from the perspective of modification detection. In the first part, the properties of optical fiber, information transmission in optical networks and individual elements of optical infrastructures are theoretically described. The next part is devoted to methods of measuring optical paths and attacks in them. In the last part, the risks of these attacks are analyzed and selected methods for modification detection are validated.
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An Innovative Control System for Water Supply Management at a Farm
Doležal, Aleš ; Sýkora, Tomáš (referee) ; Jirgl, Miroslav (advisor)
The thesis deals with the implementation of an innovative control system for the management and supply of water to the farm. For the innovation, fiber optic communication between the main switchboard and the poles at the wells was chosen. Furthermore, the thesis deals with the selection of components and sensors for the implementation of the system. The program that controls the whole application is written in ladder language in a development environment from Unitronics, from which the control PLC is also supplied.
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Hollow core optical fibers
Burian, Radek ; Horváth, Tomáš (referee) ; Münster, Petr (advisor)
The main goal of this work is to study of optical hollow core fibers and the optimalization of the splicing process for interconnection between hollow core fiber and single mode fiber. The splicing automat Fujikura FSM-100P is used in this work. On this automat is created a new splicing profile for our connection. Created splicing profile is applied to various connection methods and has been tracked a considerable impact on reducing backscattering at a splice point.
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Design and optimization of technological procedures for writing apodized Bragg fiber gratings
Folk, Jan ; Čučka, Milan (referee) ; Urban, František (advisor)
This master thesis deals with the problem of Fiber Bragg Gratings. It describes the technology of production of these gratings and focuses on the individual technological processes such as hydrogenation and stripping the primary optical fiber coating. It also deals with the apodization of Bragg gratings, describing the individual apodization functions. This paper includes the design of a specific tool for fiber transfer from the window stripping device. The issue of maintaining purity while working with an optical fiber without its coating, is also described. The next part of the thesis deals with the optimization of input parameters for writing fiber Bragg gratings (FBG) on the device used in NETWORK GROUP, s.r.o. Optimization of input parameters is very necessary to enable the writing of only apodized fiber gratings on the used assembly. This thesis deals with the evaluation and optimization of the technological procedures for the creation of apodized FBGs. The thesis also addresses the individual parameters of apodized FBGs and focuses on the repeatability of the manufacturing process.
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The effect of optical fiber attenuation on the capacity of optical traces
Žák, Ondřej ; Škorpil, Vladislav (referee) ; Reichert, Pavel (advisor)
The essence of this thesis is the creation of complex insight on optic fibre attenuation. There is successive steps explained mechanism of optical attenuation and characterized its spectral dependence. We are describing primary elements of optical attenuation, its sorts and their own spectral dependence. Bachelor´s thesis is explaining requirements of transmission system to spectral characteristic optic fibre and influence of optic fibre attenuation on capacity of optical trace. Output of bachelor´s thesis is program solution of designed mathematical model for calcula-tion spectral dependence of optical attenuation. Program is realized in MATLAB and there is furthermore added version in Microsoft Office 1997-2003. Created program is able to ap-proximate points data obtained from measurement of optic fibre by using Lagrange interpola-tion polynomial and Rayleigh scatter interlay.
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Design of optical amplifier
Somora, Rastislav ; Číž, Radim (referee) ; Slavíček, Karel (advisor)
This Bachelor's thesis deals with design and construction of support circuits for a modern optical amplifier the SOA. In the first chapter, optical transmitting medium with its physical properties and types of used cabels is described. The overview includes a list of optical cables, their damping properties and parasitic effects which can occur durring comunication. Next chapter is focused on the optical signal sources used in modern data networks, describes their internal structure and physical essence. Third chapter is dedicated to designing the optical amplifier with the SOA circuit. It focuses on the right choice of parts, their arrangement and layout of the design. Last chapter deals with set up, calibration and control of the optical amplifier module.
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Longitudinal structures in optical fibres with the use in sensorics
Falešník, Vlastimil ; Čučka, Milan (referee) ; Urban, František (advisor)
This semestral work describes key concepts, principles and basic characteristics of optical fibers. Furthermore, the principles of phase mask and subsequent records of perpendicular or tilted structures in fiber are being discussed. The work also introduces the use of such structures in sensorics as well as its connection to Bragg grating. Considerable part of this thesis is dedicated to analysis and production of longitudinal structures in fibers.
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Free-Space Optics data link
Šála, Jakub ; Číž, Radim (referee) ; Šporik, Jan (advisor)
In this thesis, shows a current issue for free space optics, limiting their use in practice with regard to the availability and reliability. They conducted measurements on wireless optical links and the observed values is calculated by the availability of the connection. Subsequently, measurements are performed on alternate versions of wireless and copper connections. Observed values were compared with a wireless optical link. It is made of optical design of wireless connections at home.
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