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Study On Chalcogenide Glass Waveguide Dispersion Tailoring And Nonlinear Applications

Posted on:2018-04-29Degree:MasterType:Thesis
Country:ChinaCandidate:Y X ShiFull Text:PDF
GTID:2348330536986049Subject:Engineering
Abstract/Summary:PDF Full Text Request
Recently chalcogenide glasses?ChGs?have emerged as promising nonlinear materials having a number of unique optical properties that makes attractive for fabricating planar optical waveguides,which include good light confinement as a result of their high refractive index,high nonlinear refractive index,wider infrared transmission window?can reach 20m m?,and negligible two photo?TPA?and free carrier absorption?FCA?at telecommunications frequencies.Thus chalcogenide glasses have great prospects for development in the mid-infrared of integrated optical devices.Many all-optical processes have now been demonstrated using dispersion-engineered chalcogenide waveguides including parametric amplification,wavelength conversion,Tb/s demultiplexing and supercontinuum generation.Thus,chalcogenide glasses have a very broad application prospect and significance of the research in many areas.Dispersion control as an essential property for chalcogenide glass waveguides plays an important role in nonlinear processes because many nonlinear applications,such as supercontinuum generation,four-wave-mixing?FWM?-based wavelength conversion,parametric amplification,and soliton formation,require a flat and low dispersion profile.Low and flat dispersion over a broad wavelength range can be used to optimize the phase matching condition,which is beneficial for many nonlinear processes.However,ChG materials usually have large negative dispersion at the near-infrared and mid-infrared band,which requires special waveguide design to compensate the material dispersion by the waveguide dispersion.We can obtain the ultrabroadband flat dispersion curve by adjusting the related parameters of the waveguide flexibly.This paper focuses on the study of chalcogenide glasses and the characteristics of the chalcogenide glasses waveguides are analyzed in detail from theoretical and simulation aspects,the article mainly includes the following sections.The first chapter provides a brief overview of the optical waveguide and its effect in nonlinear aspects,and analyzes the application of chalcogenide optical waveguide,the chalcogenide glass materials in optical aspects of the unique performance characteristics,and then combined with the properties of chalcogenide materials to illustrate the research content and significance.In the second chapter,we introduce the basic theory of the optical waveguide,and use the classical Maxwell equation to obtain the wave equation which satisfies the wave propagation.Furthermore,the propagation equation of optical pulse propagation is analyzed,and thegeneralized nonlinear Schrodinger equation is deduced by further study.Finally,the boundary conditions for the analysis of optical waveguides are also introduced.In the third chapter,we mainly introduce the two types of optical waveguides based on chalcogenide materials,and study the dispersion and effective area using the finite difference method.On the basis of parameter optimization,the flat low dispersion curve is obtained.Finally,the phase matching condition in the degenerate four wave mixing process is analyzed.In the fourth chapter,on the basis of the third chapter,we design a novel ridge chalcogenide glass waveguide?As2S3?structure,which can be used in both the quasi-TE and quasi-TM modes.For TE and TM modes,the ultrawideband and low dispersion curves with two ZDWs are obtained by the method of dispersion modulation.In addition,the effective area and nonlinear coefficient of the two models are calculated,and the output characteristics of the supercontinuum are studied under the waveguide structure.The fifth chapter is the summary of the research work in this paper,and points out the defects of the research work and unsolved problems.
Keywords/Search Tags:chalcogenide glasses, optical waveguide, dispersion, nonlinear
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