可见光通信中菲涅耳透镜仿真设计与优化

Simulating and optimizing of Fresnel lens in visible light communications

可见光通信是一种在白光LED技术上发展起来的新兴光无线通信技术,具有发射功率高、无电磁干扰等优点。相比常规透镜,在可见光通信系统的光接收天线上,使用菲涅耳透镜可以降低成本,减小透镜厚度和接收焦距。利用Zemax软件对菲涅耳透镜进行了设计、仿真与优化,首先分析了透镜设计技术要求,提出了基于菲涅耳透镜的设计与仿真方法及参数设置,然后对几类透镜进行了仿真与性能分析,在此基础上进行了透镜设计优化。结果表明,在光垂直入射且探测器尺寸为1.5 mm×1.5 mm情况下,可保证F数小于1,并得到优化的透镜结构和参数,使集光效率达到90%,为基于菲涅耳透镜的天线设计提供了理论与应用基础。

Visible light communication is a novel wireless optical communication technology based on white LED techniques. It has some advantages, such as the high emitting power, no electromagnetic interference and so on. Compared with traditional lens, Fresnel lens can be used in designing an optical reception antenna to reduce cost, thickness of lens and focal length. The designing, simulating and optimizing of Fresnel lens are addressed. The technique requirements and methods for design, simulation and parameters setting are analyzed. Some simulating results and performance analysis are also given. By using optimization, it can reach a good performance. Light collection rate at about 90% can be obtained, which ensures that the F number is less than 1 under the condition where the size of the detector is 1.5 mm×1.5 mm, which can t support the antenna design.