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中文摘要：
利用CO2激光脉冲以单侧入射方式在普通单模光纤上写出了一种折射率沿光栅轴向呈旋转分布的长周期光纤光栅．横向负载实验表明，对于折变旋转度为270°的旋转折变型长周期光纤光栅，谐振峰幅值的横向负载灵敏度为0．44dB／（g-mm^-1），是普通长周期光纤光栅的7倍；而且由于旋转变化的折射率结构降低了光栅的原始双折射，使得这种光栅在各圆周方向上谐振波长对横向负载都不敏感．利用这一特性可用于制作体积小、操作简单、成本低廉的高灵敏度光强型压力传感器．
英文摘要：
A long-period fiber grating with rotary refractive index change （R-LPFG） written in the single-side of fiber by CO2 laser pulses is designed and investigated. Theoretical analyses and experimental results show that its transverse load sensitivity is up to 0.44dB/（g·mm^-1）, which is 7 times higher than that of a free LPFG induced by the same method. In addition, it is found that the strong orientation-dependence of the transverse load sensitivity of the free LPFG reported previously has been weakened considerably due to birefringence decreased. Finally, an intensity demodulating method when the R-LPFG was used to be a pressure sensor was presented.
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