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Diffraction Effects in Transmitted Optical Beam
Poliak, Juraj ; Číp, Ondřej (oponent) ; Vašinek, Vladimír (oponent) ; Wilfert, Otakar (vedoucí práce)
The thesis was set out to investigate on the wave and electromagnetic effects occurring during the restriction of an elliptical Gaussian beam by a circular aperture. First, from the Huygens-Fresnel principle, two models of the Fresnel diffraction were derived. These models provided means for defining contrast of the diffraction pattern that can be used to quantitatively assess the influence of the diffraction effects on the optical link performance. Second, by means of the electromagnetic optics theory, four expressions (two exact and two approximate) of the geometrical attenuation were derived. The study shows also the misalignment analysis for three cases -- lateral displacement and angular misalignment of the transmitter and the receiver, respectively. The expression for the misalignment attenuation of the elliptical Gaussian beam in FSO links was also derived. All the aforementioned models were also experimentally proven in laboratory conditions in order to eliminate other influences. Finally, the thesis discussed and demonstrated the design of the all-optical transceiver. First, the design of the optical transmitter was shown followed by the development of the receiver optomechanical assembly. By means of the geometric and the matrix optics, relevant receiver parameters were calculated and alignment tolerances were estimated.
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Laboratorní úloha – analyzátor optických tras OTDR
Šimková, Barbora ; Münster, Petr (oponent) ; Dejdar, Petr (vedoucí práce)
Bakalářská práce obsahuje detailní rozbor problematiky OTDR a realizaci zapojení. Součástí práce je také teoretický rozbor optických vláken a jejich přenosových vlastností, zejména rozptylu a odrazu. Realizace zapojení byla provedena pomocí platformy Red Pitaya a připojené desky Koheron s laserem. Výsledný program byl vytvořen ve vývojovém prostředí LabView. Součástí programu je i uživatelské rozhraní pro snadné ovládání.
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Laboratorní úloha – analyzátor optických tras OTDR
Šimková, Barbora ; Münster, Petr (oponent) ; Dejdar, Petr (vedoucí práce)
Bakalářská práce obsahuje detailní rozbor problematiky OTDR a realizaci zapojení. Součástí práce je také teoretický rozbor optických vláken a jejich přenosových vlastností, zejména rozptylu a odrazu. Realizace zapojení byla provedena pomocí platformy Red Pitaya a připojené desky Koheron s laserem. Výsledný program byl vytvořen ve vývojovém prostředí LabView. Součástí programu je i uživatelské rozhraní pro snadné ovládání.
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Diffraction Effects in Transmitted Optical Beam
Poliak, Juraj ; Číp, Ondřej (oponent) ; Vašinek, Vladimír (oponent) ; Wilfert, Otakar (vedoucí práce)
The thesis was set out to investigate on the wave and electromagnetic effects occurring during the restriction of an elliptical Gaussian beam by a circular aperture. First, from the Huygens-Fresnel principle, two models of the Fresnel diffraction were derived. These models provided means for defining contrast of the diffraction pattern that can be used to quantitatively assess the influence of the diffraction effects on the optical link performance. Second, by means of the electromagnetic optics theory, four expressions (two exact and two approximate) of the geometrical attenuation were derived. The study shows also the misalignment analysis for three cases -- lateral displacement and angular misalignment of the transmitter and the receiver, respectively. The expression for the misalignment attenuation of the elliptical Gaussian beam in FSO links was also derived. All the aforementioned models were also experimentally proven in laboratory conditions in order to eliminate other influences. Finally, the thesis discussed and demonstrated the design of the all-optical transceiver. First, the design of the optical transmitter was shown followed by the development of the receiver optomechanical assembly. By means of the geometric and the matrix optics, relevant receiver parameters were calculated and alignment tolerances were estimated.
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