發(fā)布時間：2018-10-08 13:42

【摘要】：石英玻璃是一種非晶材料,具有宏觀中心反演對稱結(jié)構(gòu),因此不具有二階非線性效應(yīng)。近年來人們發(fā)現(xiàn),通過熱極化技術(shù)可以使石英玻璃材料產(chǎn)生可觀的二階非線性。這對于制造新型光纖及光纖型器件具有非常重要的意義。 芯包界面阻礙效應(yīng)會對光纖熱極化過程產(chǎn)生顯著影響,目前其阻礙效應(yīng)的機理并不十分明確�；�于光纖熱極化二維載流子模型,本文理論研究了光纖熱極化過程中的芯包界面阻礙效應(yīng),并基于芯包界面阻礙效應(yīng)提出了具有多芯層結(jié)構(gòu)的熱極化光纖,研究了影響芯包界面阻礙效應(yīng)的三個因素：纖芯的載流子初始濃度,纖芯的載流子遷移率,芯包界面的低載流子遷移率對光纖熱極化過程以及芯包界面阻礙效應(yīng)的具體作用,給出了這些因素對芯包界面阻礙效應(yīng)造成的影響規(guī)律。研究結(jié)果表明,芯包界面阻礙效應(yīng)不僅是由芯包界面的低載流子遷移率引起的,纖芯的載流子遷移率、載流子初始濃度均是引起并影響芯包界面阻礙效應(yīng)的因素�；�于芯包界面阻礙效應(yīng)將在芯包界面處產(chǎn)生電場峰值這一現(xiàn)象提出了多層纖芯結(jié)構(gòu)熱極化光纖。研究了不同的纖芯結(jié)構(gòu)、不同的載流子遷移率下不同載流子初始濃度在多層纖芯熱極化光纖中對其纖芯內(nèi)二階非線性效應(yīng)的影響。研究結(jié)果表明纖芯層數(shù)的增多、纖芯載流子遷移率和載流子濃度的降低均會使多層纖芯熱極化光纖的纖芯內(nèi)二階非線性系數(shù)增大。本文關(guān)于光纖熱極化芯包界面阻礙效應(yīng)的研究結(jié)果完善了對于芯包界面阻礙效應(yīng)的解釋,對光纖熱極化實驗有重要指導(dǎo)意義。同時,提出的多層纖芯熱極化光纖對控制熱極化誘導(dǎo)電場分布,提高纖芯內(nèi)二階非線性系數(shù),提升熱極化光纖器件的性能有重要意義。
[Abstract]:Quartz glass is a kind of amorphous material, which has a macroscopic center inversion symmetry structure, so it has no second order nonlinear effect. In recent years, it has been found that thermal polarization can make quartz glass material produce considerable second order nonlinearity. This is of great significance for the manufacture of new fiber and fiber optic devices. The barrier effect of core-cladding interface will have a significant effect on the thermal polarization process of optical fiber, but the mechanism of the blocking effect is not very clear at present. Based on the two-dimensional carrier model of thermal polarization of optical fiber, this paper theoretically studies the barrier effect of core-in-core interface in the process of thermal polarization of optical fiber, and proposes a thermal polarization fiber with multi-core layer structure based on the barrier effect of core-cladding interface. Three factors affecting the barrier effect of core interface are studied: the initial carrier concentration of the core, the carrier mobility of the core, the specific effect of the low carrier mobility of the core on the thermal polarization process of the fiber and the barrier effect of the core-in-core interface. The influence of these factors on the barrier effect of core-cladding interface is given. The results show that the barrier effect of core-in-core interface is not only caused by the low carrier mobility of core-in-core interface, but also by the carrier mobility and initial carrier concentration of the core. Based on the phenomenon that the barrier effect of core-cladding interface will produce the peak electric field at the core-cladding interface, a multilayer thermally polarized fiber with core structure is proposed. The effect of different carrier initial concentration on the second order nonlinear effect in multilayer core thermally polarized fiber with different core structure and carrier mobility is studied. The results show that the increase of core layer number, the decrease of core carrier mobility and carrier concentration will increase the second order nonlinear coefficient in the core of multilayer thermally polarized fiber. In this paper, the results of the study on the thermal polarization core-cladding barrier effect of optical fiber have improved the explanation of the core-cladding interface hindrance effect, and have important guiding significance for the fiber thermal polarization experiment. At the same time, the multilayer core thermal polarization fiber is of great significance to control the electric field distribution, improve the second order nonlinear coefficient in the core, and improve the performance of the thermal polarization fiber device.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

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本文編號：2256962