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通过分析光子晶体光纤特殊的单芯、多气孔结构及在熔接中传统校准方法的局限性,研究了光纤熔接机中校准系统结构的关键技术。利用谐衍射透镜体积小,衍射效率、精度高等特点,设计了基于谐衍射透镜的离轴光学校准系统。在可见光单波段成像,不仅有效地消除了系统的色差、彗差,大大提高了衍射效率,而且很好地完成了系统像差校正,通过该系统,准确地得到了清晰的PCF截面图像。比较两端面的PCF图像,再对光纤进行空间坐标的调整,即可实现光子晶体光纤熔接中光纤的精确对准。
By analyzing the special single-core and multi-pore structure of photonic crystal fiber and the limitations of the traditional calibration methods in fusion, the key technologies of the system calibration in optical fiber fusion machine are studied. Utilizing the advantages of small size, high diffraction efficiency and high precision of harmonic diffraction lens, an off-axis optical calibration system based on harmonic diffraction lens is designed. In visible light single-band imaging, not only the system effectively eliminates the color aberration and coma, greatly improves the diffraction efficiency, but also completes the system aberration correction. Through this system, a clear PCF cross-sectional image is obtained accurately. Comparing the PCF images of the two end faces, and then adjusting the spatial coordinate of the optical fiber, accurate alignment of the optical fibers in the photonic crystal fiber fusion can be achieved.