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A Numerical Study of Coupled Nonlinear Schrodinger Equations Arising in Hydrodynamics and Optics

A Numerical Study of Coupled Nonlinear Schrodinger Equations Arising in Hydrodynamics and Optics


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About the Book

This dissertation, "A Numerical Study of Coupled Nonlinear Schrodinger Equations Arising in Hydrodynamics and Optics" by Suk-chong, Tsang, 曾淑莊, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled A NUMERICAL STUDY OF COUPLED NONLINEAR SCHRODINGER EQUATIONS ARISING IN HYDRODYNAMICS AND OPTICS submitted by Suk-Chong TSANG for the degree of Master of Philosophy at the University of Hong Kong in June 2003 This thesis reports the findings of numerical studies of coupled nonlinear Schrodinger equations (CNLS) in both hydrodynamics and optics applications, and its focus was a model for interaction between wavepackets in the framework of CNLS. Generally, group velocity dispersion, self-phase modulation and cross-phase modulation terms are present in these equations. However, intermodal dispersion and linear coupling terms may also exist when CNLS are applied in optics. The interplay between these effects plays a crucial role in pulse evolution. A numerical method, the Hopscotch method, was introduced to solve CNLS. This is a particularly simple method for solving CNLS, and its accuracy was verified by ascertaining the evolution of a single soliton solution of CNLS and comparing this numerical solution with the exact solution. Two applications of CNLS were studied, in hydrodynamics and optics respectively. In hydrodynamics, CNLS is used to govern the interaction of wavepackets in layered fluid. The long-time evolution of periodic solution of CNLS iwas studied. The initial phase difference, amplitude ratio between perturbations and the ratio between the self-phase and cross-phase modulations were found to be important factors in long-time evolution. Different patterns of evolution may result from different combinations of these three effects mentioned above. In optics, CNLS can be used as the governing equation for wavepackets in directional couplers. Soliton interaction in directional couplers was studied, as their performance can be quite different from how they behave in single-mode fibers. Their behaviour was influenced by group-velocity dispersion, intermodal dispersion and linear coupling terms within the equations. Group-velocity dispersion was found to cause pulse coalescence, and intermodal dispersion was the cause of pulse splitting. The effect of group-velocity dispersion depends on the initial separation between the two input pulses. The closer the two pulses are located, the larger the effect on each other; but there will always be intermodal dispersion effect, no matter how far the pulses are separated. The findings of this study contribute to an increased understanding of the roles of different terms within a CNLS. The interplay between these terms can result in different patterns of evolution. ii DOI: 10.5353/th_b2665265 Subjects: Schrodinger equation Hydrodynamics - Mathematical models Optics - Mathematical models


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Product Details
  • ISBN-13: 9781361192689
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 118
  • Weight: 567 gr
  • ISBN-10: 1361192682
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 8 mm
  • Width: 216 mm


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