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本文论述了光纤光栅辐射特性．通过耦合模理论首次给出了单模光纤偏振态（SOP）与光纤光栅远场辐射损失之间的关系．实验数据与理论分析基本吻合．利用光纤光栅这一关系可实现光纤偏振态在线检测．
This article discusses the fiber grating radiation characteristics. For the first time, the relationship between the polarization state (SOP) of a single mode fiber and the far-field radiation loss of a fiber grating is given by coupling mode theory. Experimental data and theoretical analysis basically agree. The use of fiber grating this relationship can be achieved online detection of optical fiber polarization.