Study on electronic blocking layer of 403 nm GaN-based vertical cavity surface emitting lasers

In order to obtain good optical characteristics in the GaN-based vertical-cavity surface-emitting laser (VCSEL), different kinds of AlGaN electron blocking layers (EBL) were introduced. These were inserted coherently near the active region to limit electron leakage into the p-doped side. The research was conducted by photonic integrated circuit simulator in three-dimensional (PICS3D). The simulated results reveal that an EBL can improve the optical characteristics of a VCSEL effectively. All the advantages are due to a reduction in the electron leakage in the quantum wells. While the voltage of the five-layer EBLs LD is lower than the voltage of the seven-layer EBLs LD, the output power of the two is approximately the same, so the five-layer EBLs is the best choice for comprehensive structure analysis as the epitaxial structure can be grown more easily on it.     

射频系统2.5D/3D封装结构的研究进展

射频系统封装已经成为无线通信系统重要的集成技术,对于不断向高速率、小型化、多功能方向发展的无线通信系统,先进射频系统封装结构为其提供了坚实的基础.介绍了2.5D/3D射频系统封装结构的研究进程,重点分析了中介层结构、埋入结构、堆叠结构中的关键工艺,并从信号传输、电磁干扰、结构集成度等多角度出发,对不同封装结构做了深入剖...