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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。
The change of external force field information was monitored by using the reflection polarization loss of fiber grating, and the measurement performance was improved. The variation of RPDL with the external conditions was also studied. The relationship between the variation of external conditions and the relative polarization of reflection polarization was obtained by using the coupled-mode theory. The influence of the change of temperature, stress and pressure on the reflection loss polarization spectrum was simulated. The simulation results show that the polarization-dependent loss of the reflected light from FBG is insensitive to the change of temperature and stress in the outside world, but obviously depends on the change of the external pressure.