A novel highly efficient grating coupler with large filling factor used for optoelectronic integration

A novel highly efficient grating coupler with large filling factor and deep etching is proposed in silicon-on-insulator for near vertical coupling between the rib waveguide and optical fibre.The deep slots acting as high efficient scattering centres are analysed and optimized.As high as 60% coupling efficiency at telecom wavelength of 1550-nm and 3-dB bandwidth of 61 nm are predicted by simulation.A peak coupling efficiency of 42.1% at wavelength 1546-nm and 3-dB bandwidth of 37.6 nm are obtained experimentally.     

统计和概率

1.本单元重、难点分析本单元的重点:掌握随机抽样、样本估计总体、线性回归的基本概念和基本方法;理解随机现象和概率的某些基本性质;理解古典概型、几何概型;会计算简单随机事件发生的概率.本单元的难点:对样本随机性、总体分布的概念、回归直线与观测数据的关系、概率含义的理