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Study On Passively Graphene Mode-Locked Soliton Erbium-Doped Fiber Lasers

Posted on:2013-06-13Degree:MasterType:Thesis
Country:ChinaCandidate:G H WangFull Text:PDF
GTID:2248330395484797Subject:Information and Communication Engineering
Abstract/Summary:PDF Full Text Request
As a new type carbon material, the appearance of graphene subverts thetraditional theory that a perfect two-dimensional crystal structure can not be stable inthe non-absolute zero, making the formation of the crystal structure of carbon be acomplete system from one-dimensional to three-dimensional, including fullerene(C60),carbon nanotubes, graphene, graphite and diamond. In addition to excellent electricalperformance, high thermal conductivity and electrical and magnetic properties,graphene also have excellent nonlinear optical properties, with which the special two-dimensional structure makes graphene have widespread applications in the fields ofmaterials, information, microelectronics and so on. Based on the advantages ofgraphene in the optics, this paper provides a method to integrate the graphene onto afiber ferrule using an optical deposition technique and focus on studying the outputcharacteristics of wavelength-tunable graphene passively mode-locked erbium-dopedfiber laser experimentally. At the same time, the characteristics of the fiber laser havebeen discussed based on the Ginzburg-Landau equation numerically. The maincontent is summarized as follows:1. The saturable absorber was prepared by the optical deposition technique.Firstly, the graphene and dimethylformamide(DMF) solution were mixed together,and the upper graphene dispersed liquid was reserved after ultrasonic vibration andcentrifugation. Then the fiber ferrule was immersed in the dispersion and thegraphene can be trapped onto it.2. A ring cavity passively mode-locked erbium-doped fiber laser based ongraphene saturable absorber is built. As increasing the pump power to108mW, thelaser could self-start. At a pump power of about370.4mW, the pulse width is about1.32ps and the pulse repetition rate is3.16MHz with average output power of1.07mW, which corresponds to single pulse energy of0.338nJ. By adjusting thepolarization controller, we also found that the central wavelength of soliton could betuned between1556.72nm and1558.76nm. Based on Ginzburg-Landau equation, weshow the generation and tuning law of soliton pulse.3. The soliton sub-sidebands have been observed based on the graphene mode-locked fiber laser. At a pump power of205.4mW, we observed the appearance ofsub-sideband lied in the both sides of sideband by changing the position of polarization controller. Numerically we show the effect of the parameter ofpolarization controller on the appearance of sub-sideband based on the Ginzburg-Landau equation, making it clear that the appearance of sub-sideband is induced bythe modulational instability of dispersive wave.
Keywords/Search Tags:Fiber lasers, Graphene, Passively mode-locking, Wavelength-tunable
PDF Full Text Request
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