The experiment and analysis prove that effective gratingcoupling can be achieved through the reasonable design of a 2D grating for very long wavelength QWIPs.
实验与计算结果证明，合理地设计二维光栅，进行甚长波QWIP光耦合，可以获得有效的光耦合效果。
2
Through coupled-mode theory, the simulation of the coupling properties of the slanted grating is given to optimize its tilt angle.
利用耦合模理论，模拟了斜光栅的耦合特性并对其倾斜角进行优化设计。
3
The basic principles and simulation methods of a null-coupler-based OADM are studied firstly, especially in the crosstalk of a Y-branch structure and the coupling properties of a tilted grating.