【作者】 马丽伟；

【导师】 刘敏；

【作者基本信息】 重庆大学 ， 通信与信息系统， 2011， 硕士

【摘要】 空芯光子带隙光纤因为带隙的存在,提供一种全新的导光模式,在光通信和光器件等领域具有广阔的应用前景。同时光子带隙光纤具有色散可控特性,耦合特性以及非线性等传统光纤不具备的特性,特别是光纤的色散可控特性成为人们研究的重要内容之一。论文针对空芯光子带隙光纤的结构设计及色散特性进行分析,研究光纤结构参数对色散特性的影响,设计的混合结构空芯光子带隙光纤,不仅具有较低的色散值,而且具有较高的纤芯传输功率,为空芯光子带隙光纤的设计增添新的内容。首先,介绍光子晶体光纤的发展背景,主要介绍光子晶体的应用及分类,然后介绍光子晶体光纤的导光机理,并对全内反射型和光子带隙型光纤的特性进行分析。通过减小包层第一层气孔的大小,设计方形空芯光子带隙光纤,并对其色散特性、有效模面积特性、纤芯传输功率特性进行分析,结果表明方形空芯光子带隙光纤具有较低的色散特性,为设计混合结构空芯光子带隙光纤提供理论依据和参考。其次,分析六边形气孔空芯光子带隙光纤的结构参数对色散的影响,随着孔间距与曲化直径的增加,光纤的零色散波长向长波长方向移动,但是当包层气孔直径增加时,光纤的零色散波长却向短波长方向移动,为空芯光子带隙光纤色散设计提供理论参考。最后设计混合结构空芯光子带隙光纤,并取得较低的色散值及较低好的纤芯传输功率特性。通过与方形空芯光子带隙光纤、圆形气孔空芯光子带隙光纤和六边形气孔空芯光子带隙光纤色散特性对比,进一步证实混合结构空芯光子带隙光纤优异的传输特性。混合结构空芯光子带隙光纤具有较低的色散和较高的纤芯传输功率,在孤子传输,波分复用和脉冲压缩等方面具有潜在的应用。更多还原

【Abstract】 Hollow-core photonic bandgap fiber (HC-PBGF) provides a new mechanism for light guidance due to its photonic bandgap, and the hollow-core photonic bandgap fiber is also widely used in optical communications and optical devices. Meanwhile photonic bandgap fiber possesses characteristics that traditional optical fiber does not have such as dispersion controllable ,coupling and nonlinear et ,especially the dispersion controllable has become one of the important areas in study. Structure design and dispersion are analyzed in this paper , and study the influences for dispersion with variations of fiber’s structural parameters. We design a mixed structure hollow-core photonic bandgap fiber, and this fiber not only has low dispersion but also has high power transmission in core. And it also provides new contents for the design of hollow-core photonic bandgap fiber.Firstly, we introduce the background of photonic crystal fiber, mainly focuse on the applications and classifications of photonic crystal. Then we introduce the mechanism of guidance for photonic crystal fiber, and analyze the characteristics of the total internal reflection photonic crystal fiber and photonic bandgap fiber. We design a square-lattice hollow-core photonic bandgap fiber by reducing air-holes of the first ring , and analyze the dispersion、effective mode area、power in core of the fiber. The results say that the square-lattice hollow-core photonic bandgap fiber can realize low dispersion , and provides theoretical basis and reference for designing of hollow-core photonic bandgap fiber.Then, we analyze the influences of parameter variations for dispersion of hollow-core photonic bandgap fiber with hexagonal air-holes. When the hole-space and diameter with curved turn increase ,the zero dispersion point moves to long wavelength .But as the diameter of holes increase ,the zero dispersion point moves to short wavelength ,and this can provide theoretical reference for designing of hollow-core photonic bandgap fibers.At last we design a mixed structure hollow-core photonic bandgap fiber,and obtain low dispersion and good power transmission in core. Then we contrast the mixed structure hollow-core photonic bandgap fiber with square-lattice hollow-core photonic bandgap fiber ,roundness air-holes hollow-core photonic bandgap fiber and hexagonal air-holes hollow-core photonic bandgap fiber, and further confirms the excellent transmission of mixed structure .The mixed structure HC-PBGF has low dispersion and high power transmission in core , and it has potential applications in soliton transmission , pulse compression and WDM.更多还原