Supercontinuum generation and application in optical telecommunications : doctoral dissertation

[M. M. Veljković]

[9], 126 listova

Biografija autora: list 122; Bibliografija: list. 107-121.

Telecommunications

Supercontinuum generation is a phenomenon ofsignal spectrum broadening, due to the interplay between nonlinear and dispersive effects of the nonlinear medium. This phenomenon has been the subject of numerous studies in different mediums, due to its wide range of applications in a number of fields, such as tomography, metrology, spectroscopy, biomedical optics and in the field of optical telecommunications. For the analysis and modeling of the supercontinuum characteristics, it is crucial to select a medium in which signal propagation and supercontinuum generation are performed. For the application of supercontinuum in the field of optical telecommunications, optical fibers of the specific microstructure, i.e.PCF (Photonic Crystal Fiber) fibers are used, due to the high nonlinearity and the ability to model its dispersion profile, by modeling the structure of the fiber itself. In addition to the dispersive and nonlinear characteristics of the fiber, characteristics of the supercontinuum spectrum depend on a number of input signal parameters, such as wavelength, power, shape and duration of the input pulse. These parameters significantly influence the dynamics of the supercontinuum, in terms of the formation of processes responsible for the generation of supercontinuum, such as soliton fission, dispersive waves generation, self-phase modulation, etc. On the other hand, they also affect the width of the supercontinuum output spectrum and its coherence, which is crucial for supercontinuum applications in different fields. This doctoral thesis presents the investigation of supercontinuum characteristics in PCF fibers of different dispersion profiles, for different input signal parameters. Supercontinuum generation is performed at wavelengths corresponding to the first, second and third optical windows. The processes responsible for spectrum spread in different optical windows and dispersion regimes, for different values of the input parameters, are analyzed. Supercontinuum generation in PCF fibers is numerically investigated and the process itself was modeled by the nonlinear Schrödinger equation. Also, the thesis gives an overview of the probability of distribution of extreme events, RW (Rogue Wave) waves, in supercontinuum generated in the anomalous dispersion regime. Furthermore, study was focused on determining the characteristics of the supercontinuumspectrum and its coherence in the anomalous and normal dispersive regime, in order to define the optimaldispersion regime, the type of PCF fiber and the input parameters of the signal, to obtain supercontinuum spectrum, suitable for use as a multi-wavelength optical source in WDM (Wavelength Division Multiplexing) systems.

Superkontinuum, Nelinearna optika, Generalizovana nelinearna Schrödinger-ova jednačina, PCF vlakna, Ekstremni događaji, Optičke telekomunikacije, Multipleksiranje talasnih dužina

Supercontinuum, Nonlinear optics, GNLSE, PCF fibers, Extreme events, Optical telecommunications, WDM - Wavelength Divisionmultiplexing

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