为了把高功率的半导体激光器抽运光耦合入直径只有数百微米的双包层光纤内包层，以获得高的抽运功率，同时简化端面抛磨式熔接型侧面耦合器复杂的光纤处理工艺，提出了一种基于CO2激光熔接的双包层光纤侧面抽运耦合器的新方法，并进行了实验验证，介绍了试验装置和制作过程，制作了内包层直径为125μm非掺杂双包层光纤与105μm/125μm多模光纤的侧面耦合器，得到了82%的耦合效率测试结果。结果表明，所研制的熔接型侧面耦合器在侧面抽运的高功率双包层光纤激光器中具有很好的应用前景。

The purpose of coupling technology is to couple high-power laser from laser diode to double-clad fiber cladding to get the high pumped power. In order to simplify the fiber angle-polished side-coupling technology, a novel method using CO2 laser to make fused side-coupler for double-clad fiber was introduced. The experimental equipment and making process for such fused side-couplers were introduced. The side coupler, from 105μm/125μm multimode fiber to 125μm double-clad fiber, was made with a coupling efficiency of 82% by means of this method. These results show that this kind of fused side-coupler can be used in high-power side-pumped double-clad fiber lasers practically.