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Simulation of Mach Zehnder interferometer
Rozsypal, Filip ; Münster, Petr (referee) ; Čučka, Milan (advisor)
This bachelor thesis deals with the simulations of Mach-Zehnder and Michelson interferometer. These simulations are realized by VPIphotoncs and MatLab. The thesis also describes the optical and physical phenomena, the usage and the principle of operation of interferometers and results of measurements with validation of the basic work of both interferometers.
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Measurement and evaluation of dispersions in optical fibre
Očenášek, Jan ; Čučka, Milan (referee) ; Vojtěch, Josef (advisor)
This semestral project deals with measurement and evaluation of the dispersion in the optical fiber. Introduction of the work is focused on the description of the principle of optical fiber and optical environment. Another part is devoted to a detailed description of polarization mode dispersion - PMD, including the causes of which are divided into internal and external. Because of these impacts of the differential group delay DGD, which results in time delay of each polarization modes to each other and hence to reduce the transmission speed. Polarization mode dispersion is one of the most limiting factors for the realization of high-speed optical transmission, so in the next section describes the measurement and compensation of PMD effect.
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Mobile application for the analysis of the basic parameters of NGA network
Musil, Aleš ; Čučka, Milan (referee) ; Grenar, David (advisor)
Bachelor thesis focuses on measurement of quality of service within mobile networks. The thesis explains standards of mobile networks, quality of service, how achieve specified quality and measurement method. Then thesis explains server program for measuring multimedia data and mobile application for operating system Android, which can evaluate and show measured data. In the end there is shown measurement of testing data.
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Fiber optic interferometry
Srnský, Petr ; Urban, František (referee) ; Čučka, Milan (advisor)
The aim of the diploma thesis is theoretical analysis of optical fiber sensory sensing using coherent and incoherent interferometry, creation of simulation models of interferometers and their practical measurement. The first part deals with the description of basic physical principles and interferometers. In the second part the thesis deals with the description and design of optical microphones, which are based on the principles of physical interferometers Michelson and Mach - Zehneder interferometer. Both models are simulated in the VPIphotonics simulation environment. In the third part of the thesis, both models are assembled and measured. The last part of the thesis presents the differences between the interferometers and the results of the measurements.
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The Point-by-Point fiber diffraction structures
Valášek, Martin ; Čučka, Milan (referee) ; Urban, František (advisor)
The diploma thesis described the basic principles and characters of the long period fiber gratings (LPFGs). Our concern was to describe basic mathematical description of these gratings needed to their modelation and simulation. Consequently some exact models leading to changes in the shape of the spectrum LPFGs were suggested, these methods were the chirping, apodization and changes in the average refractive index navg. In the Matlab environment, programes for counting the important parametres LPFGs were created and meanwhile each model leading to the change in the shape of the spectrum was simulated.
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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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Simulation of fiber-optic components for fiber optic sensors
Jakoubek, Petr ; Urban, František (referee) ; Čučka, Milan (advisor)
This diploma thesis describes the function of commonly used elements among optical network, with an emphasis on fiber optic sensors. The basics of optical transmission and types of fibers are described, in addition to active and passive optical components, optical splitters and couplers. Optical fiber sensors are divided in two groups: intrinsic and extrinsic. Interferometric types of sensors are described in detail. The thesis compares theoretical assumptions and practical measurements of two serially-connected couplers. A~new module fulfilling real optical coupler function was made using Matlab. This module can be implemented into the VPIphotonics library. Finally, interferometric function of two serially-connected couplers was tested.
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Searching of metallic cables using geolocation systems and locator
Flídr, René ; Čučka, Milan (referee) ; Filka, Miloslav (advisor)
Subject of this work is a laboratory excersise, in which student will be going through a training polygon in an FEKT VUT area. Outcome of this work is going to be a mobile application, serving as a navigation and controll tool for students. They will be searching for control points of interests with copper lines under the ground. Then they will get information from theese lines with the help of copper lines searcher. Students should learn methods to search and localize copper lines as well as extracting data from them with the help of geolocalization andcopper lines searcher.
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Distributed temperature sensor
Holík, Tomáš ; Čučka, Milan (referee) ; Münster, Petr (advisor)
Distributed temperature sensors are currently widely used. They are used for measuring temperature using optical fiber. DTS systems measure the temperature along the optical fiber. Optical fiber is used as a direct source of information, not as a carrier. That is, optical fiber is used as a sensor measuring the temperature. This work includes designs of the measuring system DTS using Raman scattering and Mach-Zehnder modulator in a single-mode fiber.
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Structures in optical fiber
Polreich, Štěpán ; Čučka, Milan (referee) ; Urban, František (advisor)
This thesis describes the basic concepts, principles and basic characteristics od optical fibers. There are some particular types of structures of optical fibers and their use in practice. The work is also presented technology of these structures. For each of the structures is also described in which field are used, if is area of sensor technology or telecommunication technology. Considerable part is dedicated to special structures that are used especially in sensor technology thanks to its high sensitivity. The thesis describes the design of structures which have been machined by using a femtosecond laser and then states in which area thus treated fibers are used.
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