分别分析了不同空气填充率光子晶体光纤与普通单模光纤熔接过程中损耗的来源和制约机制,实验研究了熔接参数对熔接效果的影响,包括熔接损耗随放电电流、放电时间和放电功率变化的情况。通过优化调整熔接参数,对高空气填充率和低空气填充率的两种光子晶体光纤都实现了低损耗熔接,熔接损耗为0.22 dB。并利用掺镱大模场面积光子晶体光纤飞秒激光放大器作为抽运源,在抽运功率为14.7 W时,实验得到了7.45 W的高功率超连续光谱输出,光谱覆盖范围650～1 750 nm。 The sources and constraints of the loss during the fusing process of photonic crystal fibers with ordinary air-filled rate and the ordinary single-mode optical fiber are analyzed respectively. The influence of the welding parameters on the fusing effect is studied experimentally, including the variation of the welding loss with the discharge current, discharge time and discharge power Happening. By optimizing the splice parameters, a low-loss splice was achieved for both photonic crystal fibers with high air fill rates and low air fill rates of 0.22 dB. The high-power supercontinuum output of 7.45 W was obtained at a pump power of 14.7 W using a ytterbium-doped large-mode-area photonic crystal fiber femtosecond laser amplifier with a spectral coverage of 650-1 750 nm .