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给出了保偏光子晶体光纤(PM-PCF)模场的计算模型,搭建了基于近场光斑成像法的PM-PCF非圆模场在线测量装置,采用红外成像系统实现了模场参数的绝对测量。在此基础上,研究了放电对PM-PCF模场的微调作用,结合仿真计算,获得模场参数变化规律。建立了PM-PCF与传统保偏光纤的耦合损耗计算模型,确定了低损耗耦合条件,并进行了熔接实验验证,实现了PM-PCF与传统保偏光纤的低损耗熔接。
The calculation model of PM-PCF mode field is given. An on-line measuring device of PM-PCF non-circular mode field based on near-field spot imaging is set up. The infrared imaging system is used to realize the absolute measuring. Based on this, the fine-tuning effect of discharge on the mode field of PM-PCF was studied. With the simulation calculation, the variation law of mode-field parameters was obtained. The coupling loss calculation model between PM-PCF and traditional polarization-maintaining fiber is established, the low-loss coupling conditions are determined, and the fusion experiment is carried out to verify the low-loss fusion between PM-PCF and traditional polarization-maintaining fiber.