PHOTONIC CRYSTAL FIBERS : OPTIMIZATION FOR TELECOMMUNICATION PURPOSES
Typ dokumentu
disertační práceAutor
Zelený, Richard
Vedoucí práce
Lucki, Michal
Studijní obor
Telekomunikační technikaStudijní program
Elektrotechnika a informatikaInstituce přidělující hodnost
České vysoké učení technické v Praze. Fakulta elektrotechnická. Katedra telekomunikační technikyMetadata
Zobrazit celý záznamAbstrakt
Photonic crystal bers are optical waveguides based on a periodic air-glass structure o ering
higher design
exibility compared to that of standard single-mode bers. On one hand,
such bers allow for extremely tight mode con nement related to increased nonlinearity
and better chromatic dispersion controllability. On the other hand, photonic crystal bers
enable light guiding in very large cores keeping the single-mode regime of operation and
low loss.
This doctoral thesis deals with scienti c problems related to control of light propagation
within photonic crystal bers and it contributes mainly to the areas of optics, photonics,
telecommunication and sensing. The objective is to describe main design principles, nd
their limitations and consequently optimize ber geometries. Until now, these limitations
have not been investigated thoroughly and therefore became the central point for the
doctoral thesis.
The goal is not to present ber structures with novel geometries, but to investigate new
limits in designing photonic crystal bers. One of the presented designs is a photonic crystal
ber with a dispersion parameter as close as possible to zero value. Further e ort is applied
on a hexagonal ber structure that is optimized to operate as a dispersion compensator of
standard single-mode bers. The author predicts that the negative dispersion parameter
cannot be higher in this structure operating over a bandwidth larger than that considered
in this thesis.
Another important part of the thesis aims to control of con nement loss, which is used
to design a narrowband ber lter as well as an e ectively single-mode photonic crystal
ber with large e ective mode area and chalcogenide background.
Fiber designs were carried out by varying key geometrical parameters such as holeto-
hole spacing, airhole diameters in selected rings and number of rings around the ber
core. The in
uence of each structural parameter on modal properties is examined and
described in detail. Understanding the mechanism governing chromatic dispersion as well
as con nement loss is necessary not only for the ber design, but also to predict the
potential manufacturing tolerances.
Last but not least, supercontinuum generation is investigated in the designed chalcogenide
ber using the split-step Fourier method. The modal properties are calculated by
the full-vectorial nite di erence frequency domain method. The simulation models of
presented bers are veri ed by convergence testing.
Kolekce
- Disertační práce - 13000 [713]
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