异质互连通孔等效电路模型及其特性分析

考虑了三维异质集成系统中不同衬底层对通孔产生的寄生效应,分别提出了应用于单个和一对差分异质互连通孔的宽频带等效电路模型。在所提出的模型中,Csub和Gsub分别表征衬底耦合效应,Lm、Cm和Gm分别表征两个通孔之间的耦合效应。通过验证,模型在150 GHz频带范围内都具有较高的精度。基于所提出的模型,对单个和一对差分互连通孔影响其电特性的结构参数进行了深入分析,为三维异质集成电路的设计提供了依据。     

A switchable dual-wavelength erbium-doped fiber laser based on saturable absorber and active optical fiber ring filter

We propose a specific aspheric cylindrical optical system to transform Gaussian beam to flat-top and rectangular beam. The Gaussian beam shaping system is composed of dual orthogonal aspheric cylindrical lenses. The principle of shaping Gaussian beam is studied theoretically. The mapping function of arbitrary rays in an incident plane and an image plane is deduced based on the law of energy conservation, and the real ray tracing method is adopted to design the shaping system. Finally, the lens system is processed by single point diamond turning techniques. Testing results indicate that the system achieves the theoretical expectation, and the uniformity of flat-top and rectangular beam is 88.2%. The method is not only simple but also practical.     

“机床电气与PLC”课程项目化教学改革的探索

本文总结了作者近年来在"机床电气与PLC"课程方面进行教学改革的体会和认识。通过项目化教学,改革教学方式和考核方式等方法,工学结合、理实并重、学用一致、"教-学-做"一体化,师生互动来激发学生的学习兴趣,培养学生的职业技能、工程实践创新能力和综合素质,大大提高了教学质量。对同类课程也具有示范、参考和借鉴作用。     

一种新型窄线宽掺铒光纤激光器

为了实现稳定的窄线宽激光输出,设计了一种基于有源光纤环形滤波器的窄线宽掺铒光纤激光器,对其系统原理和实验分析进行了讨论。在环形腔中熔接一支分光比为50∶50的2×2熔融拉锥型耦合器,并且通过在该耦合器另外两端熔接一段长2 m的有源光纤,构成有源光纤环形滤波器,实现压窄线宽的目的。实验结果表明,在熔接环形滤波器后,输出激光边模得到明显抑制;在0~400 MHz频谱范围内,激光工作在单纵模运转状态;输出激光的3 dB线宽为3.4 kHz。