National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Measurement of polarized light properties on the dense wavelength division multiplexing in optical-fiber sensor systems
Bučko, Kristián ; Grenar, David (referee) ; Filka, Miloslav (advisor)
The polarization of light is one of the most remarkable phenomena in nature and has led to many discoveries in the optical-telecommunications sphere. The master's thesis describes the basic knowledge about polarized light, which includes the types of light polarization, the issue of Poincaré sphere, polarizing ellipse, etc. Emphasis is also placed on the measurement of optical power, where the analysis of various types of photodetectors and also polarimeters was performed. In the practical part of this work, the design of the workplace itself is described in the diagrams. Also, all devices in the workplace are analyzed and subsequently demonstrated measurement in several scenarios. The final chapter is a discussion with the measured results and graphical dependencies, comparison and analysis of results.
Implementation of OMG/DDS model and communication analysis
Bučko, Kristián ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
In bachelor´s thesis there is an introduction of OMG DDS specification, theoretical comparison of three most widespread implementations OpenDDS, Vortex Opensplice and RTI Connext, too. Important differences between data-focused publish-subscribe and object-focused client-server (e.g. CORBA) communication are also described in the thesis, as well as the usefulness of these two types in real-time systems. Implementation of RTI Connext is practically demonstrated on various types in scenarios of unsecured and secured communication where the communications themselves are caught in wireshark. The safety is evaluated in captured transfers. The publisher and subscriber codes were adjusted according to a need of measurement by which a communication latency between various sizes of a message is analyzed. A script in Python programming language was created for processing of timestamps and averaging values. A complete comparison of these scenarios and their graphical visual display are done in the end.

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