Abstract

Over the years, optical fibers have dominated the landscape of communications. At the same time, these structures have been used in a variety of ways for nonlinear optical applications, including for example photonic crystal fibers, fiber amplifiers and multimode fibers. In this respect, optical fibers represent a good platform to study and discover linear and nonlinear phenomena, such as geometric parametric instabilities, which represent important processes that take place in systems having one or more parameters that vary periodically in time or space, and constitute an essential mechanism in supercontinuum generation in the normal dispersion regime in parabolic multimode fibers. In this work, we provide a rigorous analysis of geometric parametric instabilities in parabolic multimode fibers by taking into account dispersion effects to all orders and by considering self-focusing processes. This approach leads to results that are in good agreement with experimental observations of geometric parametric instabilities. In addition, we present a new method for generating self-similar pulses based on passive, normally dispersive multimode fibers that have an exponential taper profile. On the other hand, we theoretically analyzed and experimentally observed, for the first time in optics, Aharonov-Bohm suppression of light tunneling in a four-core twisted optical fiber, including an analytical solution for the equations of motion describing this system in the presence of nonlinearity. Finally, by taking advantage of the properties of non-Hermitian degeneracies we explore the prospect for an optical omni-polarizer based on a fiber loop system, where the output polarization state depends on the modulation applied to the intensity and phase of the corresponding polarization component.

Notes

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Graduation Date

2020

Semester

Spring

Advisor

Christodoulides, Demetrios

Degree

Doctor of Philosophy (Ph.D.)

College

College of Optics and Photonics

Department

Optics and Photonics

Degree Program

Optics and Photonics

Format

application/pdf

Identifier

CFE0007998; DP0023138

URL

https://purls.library.ucf.edu/go/DP0023138

Language

English

Release Date

May 2025

Length of Campus-only Access

5 years

Access Status

Doctoral Dissertation (Campus-only Access)

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