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中文摘要：
光纤的数值孔径是光纤的重要参数，大数值孔径光纤在激光器和激光感应荧光系统中有很好的应用前景。光子晶体光纤的数值孔径与传统阶跃型光纤不同，它与光波长有密切的关系。因此，本文用光谱仪测量了不同结构的折射率引导型光子晶体光纤的数值孔径，并进行了数值模拟，研究了光波长、包层空气孔直径、孔间距等对光子晶体光纤数值孔径的影响，同时对光子晶体光纤的非线性系数、宏弯损耗、截止波长、有效模面积等与光波长有关的参数进行了研究，取得了满意的结果。
英文摘要：
The numerical aperture is an important parameter of optical fiber, and the fiber with high numerical aperture can be well used in fiber laser and laser-induced fluorescence system. The numerical aperture of the photonic crystal fiber is different from that of traditional step optical fiber, which is closely related to the wavelength. In the present paper, a spectrometer was used to measure the numerical aperture of photonic crystal fiber, and a lot of refractive index photonic crystal fibers were measured and simulated to investigate the impact of wavelength, the diameter of air-hole and the pitch on numerical aperture. According to the measured numerical aperture, the parameters of fiber related with wavelength can be better studied, including nonlinearity coefficient, macro-bending loss, effective mode area, cut-off wavelength and so on, and satisfactory results were achieved.
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