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Study On The Transmission Properties Of Optical Waves In Photonic Crystal Fibers

Posted on:2007-11-18Degree:MasterType:Thesis
Country:ChinaCandidate:W W GuFull Text:PDF
GTID:2178360182979098Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
As a new kind of developed fibers with many particular and useful characteristics, the photonic crystal fibers (PCFs) have recently attracted a great deal of interest both in theory and experiments. Since the experimental demonstration of the first PCFs, many modeling techniques have been applied to describe their characteristics. Three kinds of modeling techniques are implemented by using MATLAB in this dissertation. Based on the program, some transmission properties of the two kinds of PCFs are discussed. The main contents are:(1) Based upon the Block theory in the periodic dielectric, the reciprocal lattice and the first Brillouin zone, the plane-wave method (PWM) is implemented with MATLAB, which is used to analyze the band gap map of the two dimensional square lattice and two dimensional triangular lattice. The speed and the precision of this method are discussed, and the experiential number of the grids along each direction is given.(2) The full-vectorial finite difference frequency domain (FDFD) method is used to analyze the photonic bandgaps and the mode fields of photonic crystal fibers (PCFs) with different structures. The Comparison between the PWM and the FDFD reveals that the PWM is better in dealing with the photonic band gap problems. The conformability between the mode fields calculated by the FDFD method and the finite element software—Femlab shows that the FDFD method is feasible to solve the mode fields problems.(3) The finite difference time domain (FDTD) method, together with perfect matched layer (PML) boundary conditions, is used to analyze the photonic crystals using two kinds of excitation sources (point source and filament source). Total-fields/scattered-fields scheme are also mentioned. The radiation fields and scattering fields in several different photonic crystals are gained. In addition, the radiation fields of point source under zero boundary condition and period boundary condition are contrasted to test the PML.(4) Basing on the program of the PWM and the FDFD, two kinds of photonic crystal fibers the Photonic Band Gap PCF (PBG-PCF) and the Total Internal Reflection PCF (TIR-PCF) are analyzed. For the PBG-PCF, the band gap map and the mode fields are calculated, and the propagation loss is discussed. The dispersion and the polarization properties of the typica TIR-PCF and the ellipse core polarization maintaining fibers are discussed. At last, a new structured TIR-PCF is presented for higher relative sensitivity of the evanescent gas sensor.
Keywords/Search Tags:photonic crystal fiber, photonic band gap, plane wave, finite difference frequency domain (FDFD), finite difference time domain (FDFD)
PDF Full Text Request
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