Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components

Research on Flattened Dispersion and High Nonlinear of Photonic Crystal Fiber

Author ChenJuan
Tutor GeWenPing
School Xinjiang University
Course Signal and Information Processing
Keywords photonics crystal fiber nonlinearity dispersion multi-pole method twozero-dispersion
CLC TN253
Type Master's thesis
Year 2012
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In recent years,photonics crystal fiber widely used in the field of optical fibercommunication as a mature communication medium. It has become hot researchtropic in designing, manufacturing and applicating of photonic crystal fiber. Thedispersion, nonlinearity properties of octagonal photonic crystal fibers(O-PCF) areinvestigated theoretically in this paper. Three kinds of octagonal photonic crystalfibers have been designed, The main results are summarized as follows:Firstly, A novel octagonal photonic crystal fiber with step-structure wasnumerically calculated by using FDTD, This kind of O-PCF has broadbandultra-flattened lower dispersion.At the range of wavelength1.1—1.9m,thedispersion coefficient merely changing from-0.5—1.5ps/(km nm). The influences onthe dispersion from the air hole diameters and hole pitch was also analysed.Secondly, In order to obtain a new flattened dispersion photonics crystal fiberwith high nonlinearity, A novel octagonal photonic crystal fiber(O-PCF) structure isproposed. The effect of hole size on nonlinearity and dispersion of the PCF isanalyzed by the multi-pole method. By optimizing the diameters of the O-PCF holesand the hole pitch, a O-PCF with high flattened dispersion and nonlinearity isachieved. At the range of wavelength1.46—1.73m,the dispersion coefficient ismerely changed within±0.5ps/(km nm), and the nonlinearity coefficient is merelychanged from42.5to50(1/w-km) between1.5to1.65micron。Finally, A new O-PCF with two zero-dispersion is designed,The effect of holesize on nonlinearity and dispersion of the two zero-dispersion O-PCF is analyzed bythe multi-pole method. by optimizing the geometrical parameter, the twozero-dispersion O-PCF with high nonlinearity and nearly zero ultra-flatteneddispersion was obtained in theory.At the range of wavelength1.47—1.6μm,thedispersion coefficient is merely changed within±0.5ps/(km nm), and the nonlinearity coefficient is40.5(1/w-km) at1.55m.

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