热极化光纤芯包界面阻碍效应的研究
发布时间：2018-10-08 13:42
【摘要】：石英玻璃是一种非晶材料,具有宏观中心反演对称结构,因此不具有二阶非线性效应。近年来人们发现,通过热极化技术可以使石英玻璃材料产生可观的二阶非线性。这对于制造新型光纤及光纤型器件具有非常重要的意义。 芯包界面阻碍效应会对光纤热极化过程产生显著影响,目前其阻碍效应的机理并不十分明确。基于光纤热极化二维载流子模型,本文理论研究了光纤热极化过程中的芯包界面阻碍效应,并基于芯包界面阻碍效应提出了具有多芯层结构的热极化光纤,研究了影响芯包界面阻碍效应的三个因素：纤芯的载流子初始浓度,纤芯的载流子迁移率,芯包界面的低载流子迁移率对光纤热极化过程以及芯包界面阻碍效应的具体作用,给出了这些因素对芯包界面阻碍效应造成的影响规律。研究结果表明,芯包界面阻碍效应不仅是由芯包界面的低载流子迁移率引起的,纤芯的载流子迁移率、载流子初始浓度均是引起并影响芯包界面阻碍效应的因素。基于芯包界面阻碍效应将在芯包界面处产生电场峰值这一现象提出了多层纤芯结构热极化光纤。研究了不同的纤芯结构、不同的载流子迁移率下不同载流子初始浓度在多层纤芯热极化光纤中对其纤芯内二阶非线性效应的影响。研究结果表明纤芯层数的增多、纤芯载流子迁移率和载流子浓度的降低均会使多层纤芯热极化光纤的纤芯内二阶非线性系数增大。本文关于光纤热极化芯包界面阻碍效应的研究结果完善了对于芯包界面阻碍效应的解释,对光纤热极化实验有重要指导意义。同时,提出的多层纤芯热极化光纤对控制热极化诱导电场分布,提高纤芯内二阶非线性系数,提升热极化光纤器件的性能有重要意义。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
本文编号：2256962
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
【参考文献】
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1 张立平;任一涛;黄寅;李勇旗;王超燕;罗金龙;;光波导结构对其极化电光效应的影响[J];激光杂志;2010年05期
，本文编号：2256962
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