外界条件对FBG反射偏振相关损耗特性的影响

Influences of Environmental Conditions on Reflected Polarization Dependent Loss Property of FBG

利用光纤光栅反射偏振相关损耗对外力场信息的变化进行监测,提高了测量性能,并研究了光纤布拉格光栅(FBG)反射偏振相关损耗(RPDL)随外界条件的变化。运用耦合模理论得出外界条件变化量与反射偏振相关损耗间的关系式,并模拟了温度、应力、压力的改变对反射偏振相关损耗谱线的影响。仿真结果表明:光纤光栅反射光的偏振相关损耗对外界温度、应力的变化不敏感,但却明显地依赖外界压力的变化。

To monitor the changes of external field information by using reflected polarization dependent loss of fiber grating and improve the measurement performance, the properties of reflected polarization dependent loss （RPDL） under the environmental conditions were studied. The relations of the changes of environmental conditions and the reflected polarization dependent loss were obtained by using coupled mode theory, and the effects of the variation of temperature, stress and pressure on the reflected polarization dependent loss spectrum were simulated. Numerical simulations show that the polarization dependent loss of fiber grating reflective light is insensitive to the changes of external temperature and stress, but obviously dependent on the changes of external pressure.