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介绍了近几年国外波导光栅耦合器的研究和应用情况，重点介绍了光栅参数和波导结构对波导光栅耦合器输入耦合效率的影响以及光栅耦合器在光盘读出头、传感器、光谱分析等方面的应用
The research and application of waveguide grating coupler in foreign countries are introduced in this paper. The effects of grating parameters and waveguide structure on the input coupling efficiency of waveguide grating coupler are introduced. The effect of grating coupler on optical pickup, sensor, spectrum analysis and so on application