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提出了一种新型的、基于单个径向渐变折射率(GRIN)透镜的1×N光纤耦合方法,并基于水平入射以及垂直斜面入射光线的传播方程建立了用于求解点光源发出的光束在GRIN透镜斜面入射后的成像点的计算方法。通过将透镜前端面加工成多斜面棱镜,将输入光分为多束,光束聚焦位置可以通过系统参数来调整;被分割开的光束经会聚、优化像差后,实现1×N低损耗耦合,并进行了仿真研究;通过优化斜面倾角、物距等关键参数实现了光纤低损耗耦合。该设计方案结构简单,易于装配,为各类光子晶体光纤、多芯光纤、光纤组束和光纤合光提供了实用的耦合方法。
A new type of 1 × N fiber coupling method based on a single radial graded index (GRIN) lens is proposed. Based on the horizontal incidence and the propagation equation of incident light perpendicular to the inclined plane, The calculation method of imaging point after lens slope incident. By processing the front end of the lens into a multi-bevel prism, the input light is divided into multiple beams, and the focus position of the beam can be adjusted through the system parameters. After the divided beams are converged to optimize the aberration, the 1 × N low-loss coupling is achieved, And the simulation research is carried out. The optical fiber low loss coupling is realized by optimizing the key parameters such as inclination, object distance and so on. The design scheme is simple in structure and easy to assemble, and provides a practical coupling method for various photonic crystal fibers, multi-core optical fibers, optical fiber bundles and optical fiber combining.