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Optical Amplifiers
Mlejnek, Zbyněk ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
Optical amplifiers has sparked a revolution in the telecommunications industry during th last ten years. Optical amplifiers are devices that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Its ability to provide low-noise amplification over a range of wavelengths, fortuitously correspoding to the low-loss of silica fiber, has made optical networks economically attractive
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Coherent optical communication systems
Štohl, Jakub ; Münster, Petr (referee) ; Kočí, Lukáš (advisor)
This bachelor thesis deals with the possibilities of coherent optical networks. Describes the elements of a coherent network. The practical part deals with the simulation of coherent optical networks using PM-QPSK and PM-16QAM modulation for bandwidth of 112 Gbit/s and 224 Gbit/s.
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Laboratory exercise: Modeling of photonic communication networks
Kovaříková, Hana ; Horváth, Tomáš (referee) ; Münster, Petr (advisor)
The bachelor’s thesis deals with the issue of modern high-speed data networks and their simulation in the MATLAB Simulink environment. The theoretical part is devoted to optical networks, fibers, their properties and standards. The thesis also explains the subject of passive and active optical networks, including their components. Laboratory tasks are devoted to the simulation of the transmission of a passive optical network with a splitter and an active optical network with an amplifier.
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OTDR optical path analyzer
Šimková, Barbora ; Tomašov, Adrián (referee) ; Dejdar, Petr (advisor)
The aim of this master's thesis was a theoretical analysis of OTDR issues, analysis of OTDR device components, as well as basic parameters of this device. The thesis also includes a theoretical analysis of reflections, scattering, and various types of connectors. In the practical part, a circuit design for OTDR measurement was developed and subsequently implemented. The circuit was realized using the Red Pitaya development board and Koheron laser. Additionally, a circuit for direct method measurement was also created. In the LabView development environment, a program was created, including a graphical user interface. A laboratory task was also designed to provide a basic understanding of OTDR measurement issues.
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Laboratory exercise - EDFA amplifier
Mahút, Michal ; Münster, Petr (referee) ; Dejdar, Petr (advisor)
The bachelor thesis is describing in detail a scheme of an EDFA optical amplifier consisting of appropriate components, insertion of the device and software deployment. The whole thesis is divided into several categories. First theoretical analysis of optical-fiber cables that describes the types of optical-fiber cables, limiting phenomena affecting signal transmission in optical fibers, wave multiplexing and optical amplifiers. The implementation of the connection was built on the Red Pitaya platform, which controls the control of the MOT350_35100GC laser pump. The software controlling the EDFA amplifier was created in the LabView development environment. The appropriate connection of the pump source and the choice of the length of the erbium fiber to achieve the highest possible gain of reinforcement was verified experimentally. Part of the bachelor's thesis is a laboratory task, acquainting the solver with the problem of optical amplifiers with measurement of gain for various configurations of pump source, erbium fiber and pump power.
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Simultaneous Transmission Of Amplified Optical Signals Of Selected Photonic Services
Látal, Michal
This paper focuses on simultaneous transmission of selected photonic services by one single-mode optical fiber. The paper deals with the problem of simultaneous transmission of multiple photonic services by one optical fiber using the wavelength division multiplex technology and erbium-doped fiber amplifier (EDFA). Except common data transmission with a bitrate of 10 Gbps, a simultaneous high-speed data signal transmission with a bitrate of 200 Gbps and accurate time transmission are considered. During the simultaneous transmission of selected photonic services, the measurement of the transmission parameters was performed. In particular, the effect of possible mutual interference of individual transmission channels at 100 GHz spacing between individual signals was analyzed.
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Universal Graphical User Interface For Multi Vendor Edfa Optical Modules Control
Dejda, Petr
This article describes design and development of a universal software for communication with erbium-dopped fiber amplifiers (EDFA) optical modules using serial line. User-friendly environment created in LabView enables not only setting of EDFA parameters but also reading all necessary EDFA parameters at the same time. Multi vendor interoperability is made possible by the proposed simple implementation of control commands that are stored in a text file.
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Simultaneous transmission of photonic services in fibre optics
Látal, Michal ; Horváth, Tomáš (referee) ; Münster, Petr (advisor)
Diploma thesis focuses on simultaneous transmission of selected photonic services by one single-mode optical fiber. The thesis deals with the problem of common transmission of multiple photonic services by one optical fiber using the wavelength division multiplex technology. Furthermore, the origin and influence of nonlinear phenomena accompanying the simultaneous transmission of photonic services are described. Except common data transmission with a bitrate of 10 Gbit/s, a common high-speed data signal transmission with a bitrate of 200 Gbit/s, accurate time transmission and high-power sensor signal are considered. During the aimultaneous transmission of selected photonic services, the measurement of the transmission parameters was performed for various variants of the simultaneous transmission arrangement. In particular, the influence of nonlinear phenomena and possible mutual interference of individual transmission channels at 50 and 100 GHz between signals was analyzed.
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Utilization of light polarization when filtering the optical signal
Alexa, Jan ; Vlček, Čestmír (referee) ; Wilfert, Otakar (advisor)
This master thesis deals with the possibility of separation of useful signal from noise using polarization of laser radiation. This thesis is structured into 5 thematic units. The first unit is focused on laser radiation and its properties. The second part contains a deeper focus on the polarization of radiation, its description and the possibilities of measuring the polarization states. The third part of the thesis is devoted to the design of the measuring chains and identification of used elements. Chapter four contains measurement of status of the polarization and its results. The last chapter analyzes particular measuring chains outputs according to their spectral characteristics.
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