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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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Security system using optical sensing systems
Šišolák, Filip ; Tomašov, Adrián (referee) ; Dejdar, Petr (advisor)
The thesis deals with the issue of distributed sensing using optical fibers and its implementation within object security. The theoretical analysis extensively describes the principles of operation and potential applications of the most commonly used optical fiber sensors based on interferometry, diffraction structures, and scattering measurements. The theoretical part also includes an overview of the current state of optical sensor systems in the context of object security. For the practical part, the architecture of the fiber sensor is selected using theoretical knowledge and testing measurements. The description of the hardware and software architecture of the developed security device outlines its functionality. The conclusion of the practical part focuses on testing this device and comparing it with commercial electronic systems in terms of cost.
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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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Remote fiber optic polarization sensors in special environments
Baláž, Dominik ; Slavíček, Karel (referee) ; Grenar, David (advisor)
The aim of this thesis is to analyze the propagation of light in optical fibers using two polarization planes and to assess current polarization sensors. Emphasis is placed on the remote powering of polarization sensors in special environments. The main contribution of this work is the design of the functional arrangement of the optical fiber components to enable efficient use of the sensors in special environments, with emphasis on the detection of changes in non-electrical quantities. The results of the work confirm that the sensors provide a high degree of reliability in harsh environments and so are ideal for application in special environments, being suitable for detection over longer distances along with the possibility of use in military and chemical environments.
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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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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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Splicing of special optical fibers
Hlavatý, Václav ; Holík, Milan (referee) ; Mikel, Břetislav (advisor)
The aim of thesis is to design welding processes for special optical fibers. The text describes procedures of modification of the basic welding process for three types of PM fibers. For each fiber type was created specific welding process. All optimized welding processes were tested in terms of reproducibility.
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Apodization of the fibre Bragg gratings by use of phase mask UV exposition
Burian, Tomáš ; Hejátková, Edita (referee) ; Urban, František (advisor)
This thesis describes the problem of fiber gratings, focusing primarily on the use of Bragg's grids in the sensor. It describes the types of fiber mesh production, especially the method of writing with a phase mask. The next part deals with the possibilities of using apodization in fiber optic systems. It deals with the various functions that can be used to describe apodization. The following part describes the moire principle, especially the method of overlapping two phase masks with a different period.
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