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The Optical Fibre Dispersion Effects on Multiplex Transmission Systems
Kyselák, Martin ; Filka, Miloslav (advisor)
This doctoral thesis deals with present trend to turn up the bit rate of the optical fibres making use of wavelenght multiplex systems. There are new theoretical and practical problems caused by the new technologies. Except the known modal dispersion there exist problems caused by chromatical and polarization mode dispersion. In the opening of the thesis the known effects, which influence the payload signal, are introduced. The polarization mode dispersion has the main attention. Within the scope of this thesis there has been programmed the statistical calculator which can analyses the measured values of differential group delay by Monte Carlo calculation. Next meaningful output is the designating application of the optical routes. It is possible to mathematicaly unambiguously define the polarization mode dispersion by Jones, Stokes and Poynting vectors. This complicated calculations are mechanized and in the simulation application make possible to simulate the signification of the PMD influence at different input parameters. The thesis includes the study of the PMD modulation format impact with the results of simulations and confrontation with other scientists results. The significant output are the final practical results examinations, which can be implemented thanks to the possibility of using the FTB-5500B measuring device.
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Simultaneous bidirectional transfer of data and power supply over one fiber
Baura, Tomáš ; Šedivá, Soňa (referee) ; Havránek, Zdeněk (advisor)
This Bachelor’s Thesis deals with projecting and implementation of transmission systems using a single optical fibre for parallel bidirectional transmission of optical power and data signal. These systems include Polarization Division Multiplexing (PMD), Wave Division Multiplexing (WDM) and Time Division Multiplexing (TDM). The theoretical part of the thesis closely describes and specifies optical fibre, optical radiation sources and detectors as well as passive optical components suitable for transmission system implementation. Further, the thesis describes principles of individual transmission systems including a selection of particular optical and optoelectronic parts for the TDM and WDM transmission composition. Each chapter of the practical part of this document describes methods and processes used for individual measurements. First the individual parameters of individual optoelectronic and optical components of transmission systems are verified and characterized. This is followed by measuring the parameters of the composed TDM and WDM transmission systems such as optical loss, transmitted electric power efficiency, transfer speed etc. Finally, the possibility of outer optical signal detection on an integrated photodiode PIN of the laser diode is tested and verified, which could be used for both transmission and reception of data signal.
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Model of the Surface Optical Intensity Distribution in the Beam
Wintr, Aleš ; Hudcová, Lucie (referee) ; Wilfert, Otakar (advisor)
The aim of the thesis is first to describe the light beam spreading through free space and its characteristics. The theoretical part of the thesis developed programs that display models of beams. Given the parameters, theses models depict areal dispersion of optical intensity in the cross-section of beams. More specifically, I developed both a 2-dimensional and 3-dimensional model of beam depiction and a 3-dimensional model with variable angle of rotation of the beam trace. For this purpose I used the software Matlab R2007a. In the experimental part of the thesis I assembled a measurement chain and measured optical intensity of selected optical fibre. The measurement chain included laser Promax Prolite 80, optical source LED Promax Prolite 81, optic power meter Exfo 67A, collimator Thorlabs F810FC-1550 and optical fibres with various characteristics. The measured values were used to plot graphs depicting aerial dispersion of optical intensity and these graphs were compared with the theoretical computer model developed in the theoretical part of the thesis.
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Transmission parameters of optical access networks
Ježek, Jaroslav ; Kapoun, Vladimír (referee) ; Havelka, Dušan (advisor)
The essence of this thesis is the cognition of theoretical basis for measuring on optical fibres, elements and optical wireway as well. This work describes the methods of measuring and detection of parameters of these networks. The gained knowledge is followed by its application on two laboratory tasks. The first task is focused on usage of method of embedded loss for measuring of attenuation of fibre and followed by usage of the method OTDR for localization of defect. The second task is focused on measuring of attenuation on passive optical element using only the method of embedded losses. The laboratory tasks were described and respective conclusion and findings were drawed from each other.
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Laser transmitter with fiber
Hašek, Jaroslav ; Němeček, Jiří (referee) ; Wilfert, Otakar (advisor)
This master´s thesis deals with communication which is provided by optical devices. Optical wireless links are enforced due to high bit rate, responsibility and noise immunity. Main part of this master´s project is devoted to optical fibre, its characteristic and its usage in laser transmitter.
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Model of the metropolitan optical network
Prudík, Jiří ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
The purpose of this master’s thesis is foremost to provide a simple guide how to build elements of optical metropolitan area network. The basic model consists to sequence of construction, network topology, passive and active parts. The collection contains examples of alternative technology such as Wireless LAN with different frequency. The optical network construction based on optical cable, fibres, splices, trays, adapters, connectors and active parts for example a lot of media convertor models. After that there are demonstrating type of wavelength division multiplexer used in metropolitan area network – passive planar PCL splitter. One of the passive planar splitter are used to increase optical fibre channel. At the end of the collection a simplified examples of used measurements – optical time domain reflectometry and optical fibre transmission. Contains standard protocols or reflectogram. The conclusion of this thesis summarizes costs of FTTb (Fibre To The Building) model of optical metropolitan area network in Czech republic and future contribution for society.
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