提出了单轴各向异性材料为内包层，且其主轴沿光纤轴线（z轴）方向的双包层光纤模型，推出了矢量模特征方程。重点研究了主轴折射率比kcl对波导色散的影响，针对从矢量模特征方程求解波导色散因表达式极为复杂而无法直接求解的困难，提出了一种求解波导色散的有效方法。研究结果发现可以在不改变光波导结构参量的条件下，通过改变kcl可有效地改变光纤的波导色散。也分析了kcl、几何参量S、光学参量R 对低次模的传输和截止特性的影响。研究结果为获得更为理想的色散补偿、色散平坦光纤及设计新型无源光器件提供了重要的依据。

研究了三包层WⅠ和WⅡ型单模光纤的波导色散特性。结果发现在相同条件下，三包层WⅠ和WⅡ型单模光纤零色散点的调节范围比传统的双包层W型单模光纤明显增大。详细分析了几何参量P、Q和光学参量R1、R2对单模传输时的波导色散特性和低次模截止频率的影响。所得的研究结果为获得更为理想的色散补偿、色散平坦光纤及设计新型无源光器件提供了重要的依据。计算波导色散的方法可推广到多包层光纤。

本文研究了以单轴晶体为内包层的双包层高双折射光纤的传输和偏振特性。在弱波导近似下，应用光波导理论，得出了O光与e光的色散方程及截止特性。通过计算机的模拟与分析，划分出了截止区、单模单偏振区、单模双偏振区及多模区；分析了单模单偏区和单模双偏区存在的条件；研究了单模双偏区两偏振模式的偏振色散特性。结果表明，几何参数S、光学参数Rx、Ry及外包层折射率n3对所划分的四个区域及所对应的偏振特性有着极为明显的影响。此结果为光纤保偏器的设计和应用高双折射单模光纤构成新型光纤传感器的设计提供了可靠的理论依据。

建立了一光纤传感器系统，并对NO气体的特性进行了研究，得到了NO气体对光的吸收谱和光波长分别为350，400 及500nm 时，吸收特性随气体浓度变化特性。实验结果表明在一定条件下NO气体浓度与吸收百分比成线性关系。该系统的响应时间仅为5s，恢复时间在10s之内。

The chirped Gaussian pulse broadening induced by chromatic dispersion in two kinds of tripleclad single-mode fibers with a depressed index inner cladding was examined in this paper. In view of the impossibility to deduce the expression of chromatic dispersion directly due to the complexity of the characteristic equations, a feasible approach to calculate chromatic dispersion was established, and the influences made by the optical parameters and geometric parameters on the chromatic dispersion and chirped Gaussian pulse broadening were analyzed. The calculated results indicated that the optical parameter, that symbolizes the third clad effect, has a strong impact on chromatic dispersion and pulse broadening, and the degrees of such impact were closely related to the other parameters and operating wavelength. The evolvement processes of a traveling chirped Gaussian pulse in the kinds of triple-clad single-mode fibers with different parameters were also analyzed