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Research On The Self-similar Properties Of Optical Pulse In Optical-fiber System

Posted on:2013-04-22Degree:MasterType:Thesis
Country:ChinaCandidate:X H LiFull Text:PDF
GTID:2248330374456067Subject:Theoretical Physics
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This thesis, based on a study of background and development for self-similar pulse, gives a simple introduction of the mathematics model about pulse transmission in the optical fiber amplifier. This model includes the Ginzburg-Landau equation and the nonlinear Schrodinger equation. And we also introduce a commonly used Fourier transform method. We detailed introduces the self-similar evolution and its evolution characteristics of pulse in optical fiber amplifier with normal dispersion. Meanwhile, we investigate briefly the influences of third-order dispersion on optical pulse’s self-similar evolution and optical pulse’s evolution and the evolution properties in optical fiber amplifier with gain dispersive and gain saturation. We importantly study the self-similar propagation of optical pulse in the optical fiber amplifier with higher order term. It is found that initial input pulses with small amplitudes and widths can evolve into self-similar pulses at the asymptotic limit. The central region of the self-similar pulse is described by the invert parabola, and its width and power increase linearly, but with its peak amplitude and the width of its spectrum remain constant. The direct numerical simulation of the Ginzburg-Landau equation agrees quite well with the asymptotic theoretic predictions in the central part of the pulse. Thus, in the optical fiber amplifier, the initial input pulse can evolve into parabolic pulse at the situation of proper system parameters.
Keywords/Search Tags:Self-similar pulse, Complex Ginzburg-Landau (CGL) equation, Optical fiber amplifier, Third-order dispersion (TOD), Self-frequency shift, Self-steepening
PDF Full Text Request
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