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Ultra-short Pulse Solutions And Their Transmission Characteristics Of Graphene Mode-locked Fiber Laser

Posted on:2015-09-25Degree:MasterType:Thesis
Country:ChinaCandidate:W L ZhouFull Text:PDF
GTID:2308330461485071Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Ultra-short pulse fiber lasers have a wide range of applications in many research fields, therefore, searching new methods and new ways to get ultra-short pulses has a very important scientific significance and potential application. Recently years, graphene has been found that has a very excellent saturable absorption. Therefore, graphene has been researched widely as the saturable absorber for mode-locked fiber lasers. Most domestic and foreign research groups used grapheme as saturable absorber in solid-state lasers and optical fiber lasers experimentally. But the theoretical studies of graphene as the saturable absorber in the mode-locked fiber laser are still very rare. Therefore, determining the theoretical model of graphene mode-locked fiber lasers and researching the evolution dynamics of high power pulses have a very important scientific significance.In this paper, the coupled Ginzburg-Landau equations are used as the theoretical model to describe the pulse transmitting in graphene mode-locked fiber laser. We obtain the chirped bright-bright, dark-dark and bright-dark soliton-like pair solutions of the coupled Ginzburg-Landau equations by using ansatz method. Furthermore, we discuss their transmission characteristics and stabilities by using slipt-step Fourier transform method in detail. The results show that, after the system parameters are chosen correctly, we can get the three kinds chirped soliton-like pair solutions of coupled Ginzburg-Landau equations, and the chirped soliton-like pair solutions can also transmit stably long distance under certain disturbances. In addition, the third-order dispersion can not be ignored when the width of ultra-short pulse is shorter. So we analysis the impact of third-dispersion on the three kinds chirped soliton-like pair solutions’transmission characteristics based on the coupled Ginzburg-Landau equations, which included the third-order dispersion. The results show that, when the third-order dispersion parameter value is small, the three kinds chirped soliton-like pair solutions can all transmit stably long distance, and we get the third-order dispersion parameter ranges where the chirped soliton-like pair solutions can transmit stably.;However, when the third-order dispersion values is larger, the leading edge or trailing edge of the pulse will occur intense oscillation when the chirped soliton-like pair solutions are transmitting in the theoretical model, therefore the pulse can not transmit stably in the system. Relevant results can provide certain theoretical references for better designing and improving the performances of graphene mode-locked fiber lasers.
Keywords/Search Tags:Coupled Ginzburg-Landau equations, Graphene, Chirped soliton-like pair solutions, Third-order dispersion
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