光纤Bragg光栅的反射特性研究

Research on the reflective properties of fiber Bragg grating

阐述了由耦合模理论得到的光纤Bragg光栅的反射率的表达式 ,并且由此表达式导出了光纤Bragg光栅的反射特性 ,反射中心波长为λB=2 ·neff·Λ。进而理论分析了反射波长λ、光栅栅距Λ ,折射率微扰的最大值Δnmax、光栅区长度L和反射率Rg 之间的关系。

The reflectivity expression of the fiber Bragg grating is obtained from the coupled mode theory. And the reflective properties of the fiber Bragg grating are educed from this expression.The reflected central wavelength is λ_B=2·n_(eff)·Λ.Furthermore the relationship among the reflected wavelength λ,the grating spacing Λ,the maximum value of refractive index micro-disturber Δn_(max),the grating length L and reflectivity R_g is analyzed in theory.