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Research On Polarization Maintaining Photonic Crystal Fibers

Posted on:2012-11-07Degree:MasterType:Thesis
Country:ChinaCandidate:B HuFull Text:PDF
GTID:2248330392955074Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
Generation, development and various properties of the photonic crystal fibers(PCFs) and polarization maintaining fibers (PMFs) are firstly introduced in this paper.Compared with the conventional PMFs, highly birefringent PCFs (HB-PCFs) havemany merits. Some simulation methods are also introduced, such as the effectiveindex method, the finite element method (FEM) and the plane wave expansionmethod (PWEM). Furthermore, birefringence and mode properties of HB-PCFs aresimulated, and then some models of HB-PCFs are proposed. Finally, two kinds of theHB-PCFs are fabricated, and composition of the surface are tested. The researchcontents include:1. Two methods, the FEM and the PWEM, are introduced to simulate thebirefringence of the PCFs structure with two large holes in the cladding. Thesimulation shows that the results with the two methods matched very well inshorter wavelengths. However, the results become different with each other inlonger wavelengths. Meanwhile, a cutoff wavelength is present in some longwavelength with the PWEM, and the mode can not be propagated in the corewhen the cutoff wavelength, while some energy can be confined in the core usingthe FEM in the same wavelength. The cutoff wavelength resulting from the FEMis somewhat longer that of using the PWEM.2. The mode cutoff property of the PCFs is simulated using the FEM, and the cutoffwavelength as a function of d/Λ is obtained. A novel kind of the PCFs is designed,which has to large air-holes in the cladding and is made of magneto material. Thebirefringence property of this novel kind of the PCFs is simulated. This kind ofthe PCFs can be used as PMFs with magneto-optic property. The effective modediameter as a function of the wavelength is also simulated using the PWEM.3. Two kinds of HB-PCFs are designed in this chapter. One is a single defectstructure with four large air-holes in the cladding near the core with the otherair-holes are elliptical ones, while the other is a double defect structure with sixair-holes near the core. The dispersion results show that large air-holes near the core can sufficiently enhance the value of the birefringence. The HB-PCFs withfour holes structure has the larger x polarized mode dispersion, which indicates itcan be used in single polarized mode dispersion compensation.4. A kind of the HB-PCFs model with diamond air-holes in the cladding is designed.When the condition of the air-hole filling ratio is the same as the model withelliptical holes in the cladding, while the diagonal of the diamond holes is thesame as the ellipticity of the elliptical holes, the results show that the model withdiamond holes have higher value of the birefringence. Capillary stacking methodis also proposed to fabricate this kind of HB-PCFs.5. Two types of the PCFs model in the third chapter are fabricated, and some keyparameters are tested.
Keywords/Search Tags:photonic crystal, polarization maintaining fiber, highly birefringence, magneto-optic glass
PDF Full Text Request
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