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Optical Field Distribution Investigation of Optical Fiber Based on Vector Finite Element Method

Author: XuJieTian
Tutor: LuHuaiWei
School: Lanzhou Jiaotong University
Course: Electromagnetic Field and Microwave Technology
Keywords: Vector finite element method Vector basis functions Optical fiber Optical field distribution
CLC: TN253
Type: Master's thesis
Year: 2011
Downloads: 77
Quote: 0
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Abstract


In modern society, the developed countries optical access to the home, and even extends to the user's computer terminal, is the progressive realization of the true sense of the all-optical network. The optical fiber is the most basic physical transmission medium in the optical communication system, so the distribution of the light field of the optical fiber is very important. Can further analyze the fiber mode field structure, the propagation constant, the transmission or cut-off condition, the transmission power and the number of patterns and other characteristics by the optical field distribution of FIG. So that you can be on the basis of the theory, the image of an intuitive understanding of the transmission characteristics of the optical fiber. Vector finite element method is a widely used in electromagnetic engineering problems, numerical methods, but reported for fiber optical field distribution is very rare. This article will introduce this method for the calculation of the optical fiber optical field distribution. Firstly, a comprehensive review of the course of development of the method of analysis of the optical fiber, the vector finite element method developments at home and abroad, the latest research results, their characteristics and applications. Fiber optical field mode theory, given the the lightwave field of mathematics, said. Then, starting from the optical vector wave equation solving drawn fiber vector Solutions characteristic equation; discussed on this basis, the classification of the light-field mode; linear polarization modes of the optical fiber, the actual transmission, and LPmn each mold The optical field distribution, and gives light-field mode parameters. A comprehensive analysis of the technical specifications and typical characteristics of the step-and graded-index multimode fiber, as well as the common single-mode fiber. Attenuation of the fiber, the dispersion and nonlinear optical effect; study gives singlemode fiber, Si multimode optical fiber and the GI multimode fiber attenuation spectrum, and several common dispersion spectrum of the single-mode optical fiber. Also studied the vector of the basic principles of the finite element method, variational principle vector finite element method, the solution process; analysis to construct a rectangular block and tetrahedral unit vector basis functions. And from the electric field vector functional the passive the axial anisotropic media fill area rectangular block unit matrix, as well as passive tetrahedral elements matrix of a homogeneous isotropic dielectric-filled region and solving calculations. In addition, the researchers constructed a the interpolating triangle high-end vector finite element and tetrahedral high-end vector finite element. Meet inhomogeneous optical fiber electric vector of the light field and the magnetic vector vector wave equation, the study deduced applicable to lossless medium functional equivalent vector; new vector inner product defined by the generalized variational principle, research the functional equivalent vector can be used for lossy media issues calculation. Then establish a theoretical model of the G.652 fiber, and solving the set. Tetrahedral element mesh numerical the discrete equivalent vector functionals, numerical simulation of the electric vector of the light field distribution of G.652 fiber, the light field light intensity distribution and dispersion curves to obtain a conclusion consistent with the actual fiber parameters, the results demonstrated the feasibility and effectiveness of the vector finite element method for fiber optical field distribution.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
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