【作者】 张敏；

【导师】 刘敏；

【作者基本信息】 重庆大学 ， 通信与信息系统， 2012， 硕士

【摘要】 光子晶体光纤的结构灵活多变，使其具有独特的光学特性和十分广阔的应用前景，因而受到广泛的关注，成为当前光通信领域的研究热点之一。本文从理论上对空芯光子带隙光纤和混合导光型光子晶体光纤的结构设计与特性进行了探索性研究，主要研究内容包括：研究分析空芯光子带隙光纤中纤芯环掺杂对传输性能的影响，通过在纤芯环中掺杂高折射率介质，研究不同掺杂浓度对光纤群速度色散、纤芯能量、有效模面积和有效折射率的影响。研究发现，纤芯环掺杂可以明显改变空芯光子带隙光纤的传输特性，是控制光纤传输特性的有效方法。基于对纤芯环掺杂的研究，本文提出一种可提高空芯光子带隙光纤温度特性的新型光纤结构，即在纤芯环上对称地并入温度敏感的高折射率液体圆柱，利用全矢量有限元法研究不同波长条件下，温度对光纤纤芯能量、有效模面积和波导色散等传输特性的影响。研究结果表明，本文提出的新结构提高了空芯光子带隙光纤传输特性的温度灵敏度，使其具有更好的温度敏感特性。本文提出一种具有单偏振单模特性的混合导光型光子晶体光纤，首先利用全矢量有限元法详细分析该混合导光型光子晶体光纤的带隙范围、有效折射率和模场分布，然后结合谐振耦合原理研究该光纤的孔间距及高折射率圆柱尺寸等因素对光纤单偏振单模特性的影响，在此基础上优化结构参数，最后进一步分析该光纤的单偏振单模带宽。研究结果表明本文提出的混合导光型单偏振单模光纤能够在包含1.55μm的较宽波段范围内，实现有效的单模传输，消除偏振模色散和偏振串扰等不利因素对光纤的影响。本文的研究为空芯光子带隙光纤温度特性和混合导光型单偏振单模光纤的进一步研究与实际应用奠定了坚实的理论基础。更多还原

【Abstract】 Due to flexible structure, photonic crystal fiber (PCF) has unique optical properties andwide application prospects. Thus, PCF has received extensive attention and become a researchhotspot in the field of optical communication. This thesis focuses on structure design andproperty analysis of hollow-core photonic bandgap fiber (HC-PBGF) and hybrid photoniccrystal fiber theoretically. The primary work could be described as follows:The influence of core surround doping on transmission properties of HC-PBGF isanalyzed. By doping high refractive index medium in core surround, the effect of differentdoping concentration on group velocity dispersion, core-confined energy, effective mode areaand the effective refractive index is studied. The results show that core surround doping canalter the transmission properties of HC-PBGF significantly which is an effective method tocontrol the transmission properties of HC-PBGF.Based on the core surround doping research, a new structure is proposed to improve thetemperature feature of HC-PBGF. The new structure merges high refractive index liquidcylinders into the surround of the fiber core. By using full-vector finite element method, theinfluence of temperature on the effective refractive index, core energy, effective mode area ofdifferent wavelength is obtained. The numerical results show that the proposed structureimproves the temperature sensitivity of the transmission properties, which makes HC-PBGFhave better temperature sensitive characteristics.A hybrid guiding single-polarization single-mode photonic crystal fiber is proposed. First,the bandgap range, effective refractive index and the mode field distribution of the proposedfiber are obtained by the full-vector finite element method. Then, combined with the resonantcoupling theory, the effect of hole pitch and high refractive cylinder size on thesingle-polarization single-mode property is studied. On the basis of above analysis, the fiberstructure parameters are optimized. Finally the single-polarization single-mode bandwidth ofthe proposed fiber is analyzed. The results show that the proposed fiber achieves effectivesingle-mode transmission in a wide band range including1.55μm, and eliminates the adverseeffect of polarization mode dispersion and polarization crosstalk.The study of this thesis establishes a theoretical foundation for the further research andpractical application of hollow-core photonic bandgap fiber and hybrid guidingsingle-polarization single-mode photonic crystal fiber.更多还原