石墨烯涂覆光纖電光調(diào)控特性及光纖器件的理論研究
[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.
【學位授予單位】:燕山大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TN253
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