Theoretical Research On Supercontiuum Generation In Chalcogenide Microstructured Fiber

Supercontiuum(SC)have extensive applications in optical measurement,optical communication,optical coherence tomography,and spectroscopy etc.Compared to silllca fiber,chalcogenide microstructured optical fibers(MOFs)have the advantages of pretty high nonlinearity and wide spectral transmission window.The chalcogenide MOFs can generate SC in the ultra-wide range from near-infrared to mid-infrared waveband.This dissertation investigates SC generation(SCG)in chalcogenide MOFs pumped by different optical modes,which could provide theoretical guidance and fundaments for experimental SCG.Different MOFs are designed for the simulation of ultra-wide SCG.In addition,the evolution of SCG by different optical modes including the fundamental and high-order modes is analyzed numerically.The main contents of this dissertation are as follows:Firstly,we design chalcogenide MOFs and establish physical model about the MOFs.By changing the microstructure to control the dispersive characteristics of the MOFs,the dispersion curves are obtained for the ultra-wide SCG.Secondly,according to diffeent microstructures of chalcogenide MOFs,combining with finite element method and split-step Fourier method,the SCG is investigated when pumped at the fundamental mode.The influence on SCG by different pump wavelengths,peak powers and core diameters are analyzed numerically.Thirdly,according to diffeent microstructures of chalcogenide MOFs,combining with finite element method and split-step Fourier method,the SCG are investigated when pumped at high-order modes.The influence on SCG by different pump wavelengths,peak power and core diameters are also analyzed numerically.