基于拉锥-熔合法研制了一种高功率全光纤(2+1)×1侧面抽运合束器。利用仿真软件建立理论模型，计算了合束器耦合效率，并制备出这种侧面抽运合束器。经测试，该合束器在抽运功率为600 W时，两抽运臂的耦合效率分别为98.2%和96.3%，信号光插入损耗约为0.11 dB。利用该合束器搭建了千瓦级光纤激光放大器,双向抽运光功率达到1.8 kW时,在1080 nm处获得的激光输出功率为1.426 kW。

A high power all-fiber (2+1)×1 side-pumped combiner based on tapered-fused method is developed. The theoretical model of the combiner is set up through simulation software, and the coupling efficiency of combiner is calculated. A side-pumped combiner is fabricated. The coupling efficiencies are 98.2% and 96.3% for two pump arms respectively at the pump power of 600 W, and the insertion loss of signal light is about 0.11 dB. The combiner is applied to construct a kilowatt-class fiber laser amplifier. The output power is 1.426 kW at 1080 nm, when the power of bidirectional pumping light reaches 1.8 kW.