【作者】 李晓璐；

【导师】 黄勇林；

【作者基本信息】 南京邮电大学 ， 光学工程， 2012， 硕士

【摘要】 密集波分复用（DWDM）技术作为当下实现光纤扩容最主要的措施,引起了国内外学者的广泛关注,而可调谐光滤波器是DWDM技术中至关重要的器件之一。近年来,各种可调谐光滤波器的研究已成为一个热点。为此,本文对基于高双折射光子晶体光纤（Hi-Bi PCF）环镜梳状滤波器进行研究,由于该滤波器具有偏振无关、工作波长范围宽、性能稳定、操作灵活、信道间隔可调、有效降低偏振模色散（PMD）等优点,因此受到广泛的应用。本文采用全矢量有限元法,对光子晶体光纤（PCF）的高双折射特性进行了详细的理论分析和数值仿真,然后以Jones矩阵理论为基础,进一步研究了基于高双折射光子晶体光纤（Hi-Bi PCF）环镜梳状滤波器的输出光谱,为实际应用提供了理论依据。本文主要的研究如下:1)首先设计了一种有中心椭圆缺陷孔的矩形点阵光子晶体光纤（PCF）,并采用全矢量有限元法对该光纤的模式双折射特性进行了理论分析及数值模拟。研究发现,该光纤在波长为1.55μm处,具有很高的模式双折射,其值为1.87×10^-2,从而为保偏光纤提供了很好的理论模型。2)采用Jones矩阵理论,推导了基于高双折射光子晶体光纤（Hi-Bi PCF）环镜梳状滤波器的输出谱函数,并通过MATLAB软件仿真讨论了偏振控制器（PC）对滤波器输出光谱的影响。3)讨论了沿x轴正向、y轴负向侧向静压力对高双折射光子晶体光纤（Hi-Bi PCF）环镜梳状滤波器透射谱、光谱信道间隔和信道间隔随压力变化的灵敏度的影响,并比较了两种PCF滤波器信道间隔随压力变化的灵敏度。仿真结果显示,该光滤波器是一种偏振无关、工作波长范围宽、信道间隔可调谐、性能稳定、有效降低偏振模色散（PMD）的光器件,在光纤传感、光放大器及DWDM系统等方面具有广阔的应用空间。更多还原

【Abstract】 As the main method to expand the capacity of the optical fiber,Dense Wavelength Division Multiplexing （DWDM） technology has attracted more and more attention of the scholars both at home and abroad. And tunable optical filter is one of critical components in DWDM technology. In recent years,the research of various tunable optical filters has become a hot spot. Therefore,in this thesis, a type of comb optical filter based on high birefringence photonic crystal fiber loop mirror is investigated. With the advantages such as polarization-independent, wide wavelength span, stable performance, flexible operation, tunable channel spacing, low polarization mode dispersion , and so on, the filter has been widely used.In this paper, using full-vector finite-element method, the high birefringence characteristics of the photonic crystal fiber （PCF） are theoretical analyzed in detail and numerical simulated. In addition,further researches on output spectrum of high birefringence photonic crystal fiber loop mirror comb filter are taken based on the theory of Jones matrix,which provide theoretical basis for the practical application.The main achievements are as follows:1) A new kind of rectangular lattice photonic crystal fiber with a central elliptical defect hole in the core region is designed. The modal birefringence characteristic is studied using full-vector finite-element method. By simulation, it can been seen that the high modal birefringence of the PCF is 1.87×10^-2 at the wavelength of 1.55μm,which provides a good theoretical model for the polarization maintaining fiber.2) Using the theory of Jones matrix, the output spectral function of the comb filter based on high birefringence photonic crystal fiber loop mirror is derived,and the impact of polarization controller on the output spectrum of the filter is discussed by the MATLAB software simulation.3) The impact of lateral static pressure along the x-axis positive side、y-axis negative side on the transmission spectrum, spectral channel interval and channel spacing of high birefringence photonic crystal fiber loop mirror comb filter is discussed. And the sensitivity, which is different with channel spacing with various pressure of two kinds of PCF filters. By simulation, the optical filter is a kind of optical device with various advantages such as polarization-independent , wide wavelength span, tunable channel spacing, stable performance, low polarization mode dispersion, which could be widely used in the fields of fiber-optic sensing, optical amplifier, DWDM systems and so on.更多还原