The coupled way with globular lens in end side of step index fiber(SIF) is a simple and practical method to increase the coupling efficiency between semiconductor optical resource and SIF.
采用光纤端面球透镜耦合方式，是提高半导体光源与阶跃折射率光纤之间耦合效率的简单实用的方法。
2
Taking 4 step and 8 step and 16 step Fresnel lens for example, the effect of alignment error on diffractive efficiency is analyzed systematically and simulated by computer.
并以4台阶、8台阶、16台阶菲涅耳透镜为例，系统分析对准误差对衍射效率的影响并进行计算机模拟研究。
3
The results of computer simulation can provide theoretical basis for the fabrication of 16-step Fresnel lens.