纤芯圆对称分布多芯光纤的耦合特性

摘要

通过将标准单芯单模光纤与纤芯圆对称分布的多芯光纤的一个纤芯对准熔接后,再在多芯光纤任意位置进行热熔融拉锥,实现多芯光纤光功率的高效耦合注入和光功率在各个纤芯中分布比例的控制,解决了由于多芯光纤结构的特殊性引起的光源光功率难于直接注入的问题.基于光纤耦合模理论建立多芯光纤各纤芯之间的耦合模方程,得到各个纤芯中光功率与耦合长度之间的关系曲线,并与实际耦合实验结果对比,验证该方法可行.研究结果可为多芯光纤光学器件的发展提供潜在的应用价值.%We proposed an effective method to control the incident light power distribution ratio in each core of a core circular symmetrical distribution multi-core optical fiber. This method is realized by tapering the multi-core fiber to be a bi-tapered shape after fusing the multi-core fiber with a normal single mode fiber on the condition of core alignment. Based on the coupling theoretical model and analysis, the controlling method is introduced, and the results are demonstrated by both theory and experiment. Finally, this incident power distribution controlling method provides a helpful and potential application prospect for multi-core optical fibers devices and sensors.