可以计算的有低通高通带通带阻，切比雪夫巴特沃斯8种滤波器，耦合器有两种定向耦合器，

A novel and simple polarization independent grating couplers is designed and analyzed here, in which the TE polarization and the TM polarization light can be simultaneously coupled into a silicon waveguide along the same direction with high coupling efficiency. For the polarization-insensitive grati

定向耦合器设计的PPT，利用ADS设计的