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Design And Supermode Analysis Of Seven-core Photonic Crystal Fiber

Posted on:2014-11-15Degree:MasterType:Thesis
Country:ChinaCandidate:M LiuFull Text:PDF
GTID:2268330422466611Subject:Detection Technology and Automation
Abstract/Summary:PDF Full Text Request
Optical fibers are the backbone of modern telecommunication networks. Photoniccrystal fiber is especially popular in optics because of its unique light transportingproperties. Introducing the air holes in the cladding, photonic crystal fiber has theincomparable features, such as endlessly single-mode, flexible dispersion and highnonlinear. Photonic crystal fiber (PCF) is attracting much attention due to its potentialapplications, such as ultrafast laser optics, optical communications and the field of strongfield physics, and so on.In this paper, the index-guiding six-fold symmetric photonic quasi-crystal fiber hasbeen considered. The content in the paper has the following respects:(1) The basic characteristics of the photonic crystal fiber are analyzed, such asendlessly single-mode, flexible dispersion and high nonlinear. Then the photonicquasi-crystal fiber and multicore fiber are simply described.(2) The troditional theory of numerical simulations has been introduced andcompared with the advantages and the disadvantages. The numerical simulations have theeffective index method, plane wave expansion method, multiple method, the finite elementmethod and the finite different method and so on. The methods using in the structure arediscussed in detail.(3) The theoretical work based on the coupled modes theory is presented, which theorigin is the double waveguide mode coupling. Based on the functional variational theoryof electromagnetic wave equation, the finite element method calculates the supermodes ofphotonic quasi-crystal fiber. The far-field beam profile is provided by the in-phasesupermode of the seven-core PQF. The photonic crystal fiber is adjusted by varying thesize of air holes among guiding cores so that we could get identical modes in the sevencores.(4) In this article, we propose a novel seven-core photonic quasi-crystal fiber (PQF)with a six-fold symmetry, and offer a recipe to design custom-shaped modes for multicorephotonic quasi-crystal fibers (MCPQFs). Using the coupled mode theory and the finite element method, it is possible to optimize uniformly distributed modes by adjusting the airholes radius in the seven-core PQF. The supermodes of PQF are calculated by the finiteelement method (FEM). Mode shaping is realized and far-field distribution mode is given.The seven-core PQF is analyzed in detail and the results will be applied in high-powermulticore fiber lasers and amplifiers.
Keywords/Search Tags:photonic quasi-crystal fiber, single mode fiber, multicore, the finite elementmethod
PDF Full Text Request
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