熔融拉锥技术在光纤耦合传输中的应用

为了实现光纤激光器和放大器系统中不同参量光纤的低损耦合,采用光纤拉锥方法来实现光纤连接。经过理论分析,在大数值孔径光纤传输到小数值孔径光纤时,采用光纤拉锥技术可以有效地提高传输功率。采用改造的大模光纤熔接机进行拉锥实验研究,精确控制拉锥时间、放电功率、步进量和步进速率可以获得不同的拉锥形状。采用光纤拉锥元件对标准单模光纤和大模场光纤进行耦合实验,得到纤芯内传输的耦合输出效率由之前的50%提高到85%,获得了低损连接效果。结果表明,熔融拉锥技术为不同光纤之间的耦合提供了一种简单实用的方式。

Fused taper technique for fiber coupling applications

In order to reduce coupling loss between different fibers in a fiber laser or amplifier, fused taper technique was applied to couple fibers. Based on theoretical analysis, when the laser signal transmitted from a large numerical aperture (NA) fiber into a small NA fiber, the transmitted power can be improved effectively with fused taper technique. In experiment, large-mode fiber fusion splicer was applied to taper fibers. Different tapered fibers can be achieved with precise control of arc-discharged time and power, stepped size and velocity. The transmitted efficiency was improved from 50% to 85% with much lower coupling loss for the coupling between a standard single-mode fiber and a large-mode fiber based on fused taper technique.. Fused taper technique offers a simple and practical method to couple different fibers.