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OTDM to WDM conversion
Kupčiha, Lukáš ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of this thesis was introducing the options of conversion between OTDM and WDM technologies. Since this issue is rather extensive, first of all the principle of optical transmission system is described. One chapter presents the effects influencing the optical transmissions. Material absorption, linear and nonlinear scattering and bending losses are mentioned in terms of fiber losses, followed by description of waveguide, chromatic and polarization-mode dispersion of optical fibers. Last part of the chapter presents nonlinear effects, including self-phase modulation, cross-phase modulation and four-wave mixing. The practical part of the thesis deals with multichannel systems. The principles of frequency, space a hybrid multiplexing are explained. Multichannel systems with optical time domain multiplexing and waveguide multiplexing are described in detail and compared. The elements of the transmission chain of multiplex, such as different types of lasers, detectors, modulators, optical amplifiers, splitters, couplers, MUX and DEMUX are discussed. The next part of the thesis was aimed at suggesting the model of mutual conversion between OTDM and WDM systems. First of all, the previously performed experiments concerning the conversion between OTDM and WTM were evaluated. Then the model of OTDM/WDM/OTDM conversion was designed, with explanation of its parts and their function. The general recommendations for practical implementation were are also included. Due to the limited amount of time reserved for access to the simulation program Optsim, the simulations were performed only for certain parts of the proposed conversion model. At the end of the thesis, the proposed model is evaluated.
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FTTH deployment in local networks
Horníček, Lukáš ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The master’s thesis is focused on the theoretical and practical issues of optical access networks. The first chapter of the thesis deals with the concept of the access networks known as FTTx. The second and third chapters focus on the principles and standardization of the active optical network AON P2P and the passive optical network TDM PON. The fourth chapter of the thesis focuses on the network WDM PON, wavelength multiplexes, solution concept and the LG-Ericsson EA 1100 platform. The fifth chapter of the thesis deals with the infrastructure of the optical paths for optical access networks. The sixth chapter of the thesis presents custom design of the headend for reception, processing and distribution of television broadcasting. Two custom access network solutions (AON P2P and WDM PON) for the town Bystřice nad Pernštejnem are presented in the seventh chapter. Case studies include the design of the optical paths infrastructure, central office infrastructure, end-user infrastructure, CAPEX/OPEX economic analysis and basic simulation in OptSim.
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Optical cabling - a comparison
Zelinková, Vlasta ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The thesis is focused on an analysis of mounting and cable laying fiber optic lines. The first chapter includes an analysis is made comparing parameters fiber and copper cabling, mainly in terms of access networks. This part specifies the various transmission media and access networks that are operated on them. Attention is focused on the transmission rate and its possible impact, provided the capacity and other important values. This section also demands site maintenance, service, or any failure on the routes of these networks. With this goal in the second chapter was created several designs networks that provide insight into possible solutions to the situation for emerging networks, and for upgrading existing networks, using both management and elements of optical and copper, or combinations thereof. Provide information from expert sources and verified directs the work of the future and to clarify further the eventual development of individual technologies. Most other space and offers the potential of optical technology, nature, and therefore the third chapter is fully devoted to only the transmission medium. At the beginning of this section is a theoretical analysis of possible ways of cable laying fiber optic cabling with a comparison of advantages and disadvantages. The most stable is an underground installation, which is costly in standard cases. As a result of these factors proved to be a possible solution using the underground installation of water pipeline shutdown. Therefore, the optical path designed, organized and implemented laying of fiber optic cable. By completing the inspection measurement and evaluation of the cost compared with other ways of installing fiber optic cable.
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POF - polymer optical fibres
Mikulec, Matěj ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
This work focuses on polymer optical fiber (POF). It describes basic properties of polymer optical fibers, materials for production and methods of manufacturing processes. In following chapters are given individual fibers that vary different refractive indexes and diameter of fiber. Also there are analyse connectors which are used for joining. As very suitable solution for home installation seems to be using the system Optolock without connectors. In the work is also written several areas where it is possible to use the POF. It can break through in automotive industry, home networks or as a sensor. The practical part contains measuring polygon draft and FTTH proposal using POF for distribution system in the house, where P2P topology is choosen. It´s also made a proposal for distribution of POF in the apartment. For installation in the apartment prices of network components are compared between POF distribution and UTP cat.6 cabling. UTP cat.6 is in this comparison many times more cheaply. Final chapter evaluate demands on work with POF fibers. Describes preparation of fiber before communication and creation of small experimental network. Important findings of the work are summarized in the conclusion.
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DWDM in access networks
Šifta, Radim ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of this master´s thesis is an explanation of the problem of optical access networks with wavelength division multiplex, main purpose is to demonstrate the difference between simulation and real measurement. The thesis is divided into several basic thematic areas. At the beginning of thesis is outlined the basic division of multiplexing system, there are discussed the basic solutions of wavelength multiplexes and their possible combinations. The next chapter deals with the active elements, which are an essential part of xWDM systems such as optical lasers, detectors and amplifiers. The following chapter is focused on the passive elements, especially on the passive filters, which form a key part of the wavelength multiplex. Methods of measurement C/DWDM networks are discussed in the next part of thesis. The next chapter describes the topology used by active and passive optical networks. Penultimate part of this thesis consists of designs simulated models PON and WDM-PON networks and comparing their transmission parameters. The final part presents the results of practical measurements of experimental optical access network with wavelength division multiplex, the results are simultaneously compared with results of simulations.
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Optimization and parameter measurement of PON network FTTX
Černý, Michal ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
Práce rozebírá současný vývoj na poli pasivních optických sítí a jednotlivé generace přenosových standardů. Podrobněji se zabývá parametry ODN, metodami jejich měření a volbou potřebných měření v praxi. Hlavní část práce je zaměřena na měření pasivního WDM prvku, kde je provedena analýza vstupů a výstupů, měření vložného útlumu a přelechů podle ORL na provozních vlnových délkách.
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Methodology for designing PON networks
Dallal, Anas Omar ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
Cílem této práce je analyzovat současný stav přístupových optických sítí,a hlouběji prozkoumat PON metodiku a návrh sítě. Navrhnul jsem síť založenou na konceptu FTTH pro 90 rodinných domů ovládané z centrální stanice vzdálené 20 km. Zabýval jsem se problémy při návrhu FTTH, konkrétně pasivní optickou sítí. Dále jsem se zabýval ATM-PON a Ethernet PON (EPON), které jsou založeny na společné síťové architektuře, PON, ale používají jiné přenosové technologie na podporu integrovaných služeb a jiné protokoly. Po zadání (optimálního) síťového řešení, které se hodí pro nabídku Triple-Play služeb. Dále budu popisovat, jak fungují síťová propojení a také budou popsány metody měření a testování navržené sítě "po aktivaci a nastavení sítě" a "před aktivací síťových služeb ". Při měření jsem také používal OTDR a prakticky ověřil charakteristiku linky. V práci je také naznačeno monitorování optické sítě.
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Simulation of optical route monitoring
Mlejnek, Zbyněk ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
Monitoring optical line for a long term monitoring and evaluating both transfer quality and running reliability of optical line links' physical layer (optical cable routes) fiber optical transfer systems. Monitoring indicates any kind of security erosion of transmission medium incited by either "natural" climatic and mechanical environmental effects, indeliberated cable violation (building operation) or by intended intervention into transfer path.
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"Triple Pley" - FTTH
Bobkovič, Peter ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
This project is zaobíra possible implementation of the last mile connection to užívateli through FTTH, what is optics to the home. The whole work is divided into 2 parts, and to a general overview of FTTH and its own measurements. In general overview of the listed species gradually FTTH networks, problems associated with FTTH, zmapovaná situation in the world and Triple game (Pricelist, ponuka TV and under.). In the second part of the developed progressive measure, and the results of the three carried out measurements (PPM, OTDR, directly method) as well as the appearance of purity connector.
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Optical Wavelength Division Multiplex
Kavický, Martin ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
This bachelor's thesis is orientated to problems about optical networks and possibilities of transmision more than one optical mode trough single fibre. Components, which create optical path, are described there. I was concerned with kinds of fiber couplers, optical multipexors and demultiplexers, proper souces and receivers of optical radiation, possible optical amplifiers and in not least turn single types of wavelenght division multiplexing. In practical part I propose possible ways of verification of activity of wavelenght division multiplexing and optical path components, as is EDFA amplifier, or circulator. As insertion of thesis, I created concept of active task, in which will students meat with meassuring optical power after way through EDFA amplifier, which they will tune.
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