双折射作用下横向受力光纤光栅反射谱的仿真研究

Simulation Research on Reflection Spectra Fiber Grating of Transverse Force to Grating Section under The Effect of Birefringence

仿真分析了光纤布拉格光栅(FBG)横向受力时的双折射现象及其光纤光栅横向局部受力时的光谱变化,并进一步分析了双折射对横向局部受力光纤光栅的影响。当FBG横向局部受力部分较大时,光纤双折射对反射光谱的影响较大;当受力部分较小时,双折射的影响较小,此时可以把横向局部受力FBG结构看作法布里-珀罗(F-P)腔。希望这能对此类传感系统的光谱检测具有一定的参考价值。

Birefringence of fiber Bragg grating （FBG） under transverse force to grating section and reflection spectra of FBG under local pressure are studied by numerical simulation. The effects on birefringence to reflection spectra of FBG under local pressure are analyzed. The results show that the effects on birefringence to reflection spectra of FBG under local pressure are greater when the length is longer, on the contrary the effects are less. In this situation, the FBG under transverse force to a small grating section is regarded as fiber grating Fabry-Perot cavity. This may have reference value to later spectrum detection experiment.