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Dispersion Properties Of Photonic Crystal Fibers And Supercotinuum Generation

Posted on:2006-11-14Degree:MasterType:Thesis
Country:ChinaCandidate:X W SunFull Text:PDF
GTID:2178360212471290Subject:Physical Electronics
Abstract/Summary:PDF Full Text Request
A new type of fiber, known as photonic crystal fiber, has emerged in the past several years. These fibers are characterized by wavelength-scale air holes running along the entire fiber length in the cladding region, which have resulted in some unusual properties unattainable with conventional optical fibers. The dispersion and losses properties of photonic crystal fibers are investigated theoretically in the present dissertation. The experimental and numerical results for nonlinear evolution of femtosecond pulses during propagation in photonic crystal fibers are presented.The main results are summarized as follows.In Chapter One, the photonic crystal fibers and their character are introduced. The dispersion and losses properties of photonic crystal fibers are investigated using the multipole method in chapter two. The influence on photonic crystal fiber dispersion and losses of the diameter of the air holes, the pitch, the number of rings, the size of air holes in different rings within the cladding is studied.In Chapter Three,The nonlinear Schrodinger equation with higher-order dispersions and nonlinearity has been applied to describe the propagation of femtosecond laser pulses and supercontinuum generation in photonic crystal fibers. The impacts of the input pulse duration, the pulse peak power, the input pulse chirp and the input pulse shape on the supercontinuum generation are also expatiated.The experimental results for nonlinear evolution and supercontinuum generation of femtosecond pulses during propagation in different structured photonic crystal fibers are presented in chapter four. The pulse energy and insert length of the prism effect on the supercontinuum generation are also discussed in this chapter. At last, we make some suggestions of the future work, which gives a direction for further study on photonic crystal fibers.
Keywords/Search Tags:Photonic crystal fibers, Multipole method, Dispersion, Losses, Supercontuum generation, Femtosecond laser
PDF Full Text Request
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