石墨烯涂覆光纤电光调控特性及光纤器件的理论研究

发布时间：2018-11-11 17:54

【摘要】：随着光信息传输与处理速度的高速发展,光纤器件微型化、集成化和低能耗化是光纤通信技术的发展趋势。石墨烯具有超高的载流子迁移率,超快的弛豫过程,可调控的费米能级,还可以吸收很宽频率范围的入射光,非常适合于光纤器件的设计。本文提出了一种新颖的石墨烯-光纤复合结构,首次将石墨烯涂覆在空心光纤和光子晶体光纤的纤芯孔内表面上,利用有限元法对该结构的调制特性、滤波特性和偏振特性进行了分析。本文的主要内容如下:首先,结合通信技术的发展历史,介绍了本课题的研究目的和意义,而且在查阅大量国内外相关文献的基础上,对基于石墨烯的光纤器件的研究现状进行了综合评述,总结了石墨烯和光纤的主要结合方式。其次,从石墨烯的能带结构出发,分析了石墨烯的线性光吸收和电光调制特性,并且介绍了分析光纤传输特性的解析方法和数值方法,重点介绍了本文所采用的有限元法,进一步给出了仿真软件的模拟过程。再次,设计了基于石墨烯涂覆空心光纤的调制器模型,利用有限元法研究了光纤的模场分布和电致吸收特性,同时研究了空气孔半径、石墨烯层数和缓冲层对调制器性能参数的影响。最后,设计了三种基于石墨烯涂覆光子晶体光纤的器件模型:第一种将石墨烯涂覆在圆形纤芯孔内表面上构成电吸收型调制器,分析光纤损耗随化学势的变化规律,研究其调制特性;第二种将石墨烯涂覆在圆形纤芯孔内表面上构成带阻滤波器,分析光纤损耗随波长的变化规律,研究其滤波特性;第三种是将石墨烯涂覆在椭圆形纤芯孔内表面上构成偏振器,分析TE和TM模式的损耗随化学势的变化规律,研究其偏振特性。同时利用有限元法研究了光纤的结构参数和石墨烯的材料参数对光纤器件性能参数的影响。
[Abstract]:With the rapid development of optical information transmission and processing speed, the miniaturization, integration and low energy consumption of optical fiber devices are the development trend of optical fiber communication technology. Graphene has high carrier mobility, ultra-fast relaxation process, adjustable Fermi energy level, and can absorb incident light in a wide frequency range, which is very suitable for the design of optical fiber devices. In this paper, a novel graphene fiber composite structure is proposed. Graphene is coated on the inner surface of the core hole of hollow fiber and photonic crystal fiber for the first time. The modulation characteristics of the structure are obtained by finite element method. The characteristics of filtering and polarization are analyzed. The main contents of this paper are as follows: firstly, according to the history of communication technology, this paper introduces the purpose and significance of this research, and on the basis of consulting a large number of domestic and foreign related literature, The research status of graphene based fiber devices is reviewed, and the main combination modes between graphene and fiber are summarized. Secondly, based on the energy band structure of graphene, the linear optical absorption and electro-optic modulation characteristics of graphene are analyzed, and the analytical and numerical methods for analyzing the transmission characteristics of optical fiber are introduced, with emphasis on the finite element method used in this paper. Furthermore, the simulation process of the simulation software is given. Thirdly, the modulator model based on graphene coated hollow fiber is designed. The mode field distribution and electroabsorption characteristics of the fiber are studied by finite element method, and the air orifice radius is also studied. The effect of graphene layer number and buffer layer on the performance parameters of modulator. Finally, three kinds of device models based on graphene coated photonic crystal fiber are designed. First, the graphene is coated on the inner surface of circular core hole to form an electric absorption modulator, and the variation of fiber loss with chemical potential is analyzed. The modulation characteristics are studied. Secondly, graphene is coated on the inner surface of circular core hole to form a bandstop filter. The variation of fiber loss with wavelength is analyzed, and the filter characteristics are studied. The third is to coat graphene on the inner surface of the elliptical core hole to form a polarizer. The variation of the loss of TE and TM modes with the chemical potential is analyzed and the polarization characteristics of the polarizer are studied. At the same time, the influence of fiber structure parameters and graphene material parameters on the performance parameters of fiber devices was studied by finite element method.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN253

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