摘要
提出了一种基于模间干涉原理的双空气孔保偏光子晶体光纤弯曲传感方法。采用有限差分光束传播法对保偏光子晶体光纤弯曲传输特性进行了仿真研究,给出了在弯曲调制时两个低阶偏振模干涉产生的双边瓣归一化光强与弯曲半径的关系,讨论了波长变化对弯曲传感灵敏度的影响,并对所设计的弯曲传感器进行了实验研究。研究结果表明：基于模间干涉技术的双空气孔光子晶体保偏光纤弯曲传感器在10~30 mm的弯曲半径范围内具有良好的线性度和检测精度。
A novel bending sensing scheme based on intermodal interference of dual-hole polarization maintaining photonic crystal fiber（PM-PCF） is presented. The finite difference beam propagation method is used to analyze the bending characteristics of dual- hole PM- PCF. The relationship between normalized interference output intensity of two low order polarization modes and bending radius is calculated thoroughly when the dual-hole PMPCF is modulated by bending. Further, the wavelength influence of bending sensing characteristics is discussed theoretically. And an experiment system is set up to verify the feasibility of bending sensing based on intermodal interference in dual-hole PM-PCF. The experimental results show that the bending sensor designed in this paper has excellent linearity and accuracy when the bending radius ranges from 10 mm to 30 mm.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2015年第9期182-188,共7页
Chinese Journal of Lasers
基金
国家自然科学基金(60907033)
河北省自然科学基金(F2013203252)
河北省科学技术研究与发展计划(13273305)
关键词
光纤光学
模间干涉
保偏光子晶体光纤
弯曲传感
干涉输出边瓣
fiber optics
intermodal interference
polarization maintaining photonics crystal fiber
bendingsensing
interference output sidelobes
