关于镀有LB膜长周期光纤光栅的谐振波长的研究

The Study of the Resonant Wavelengths of Long-period Fiber Grating with Langmuir-Blodgett Thin-film Overlay

摘要: 理论上详细分析了长周期光纤光栅谐振波长随外界环境折射率变化而变化的光谱特性，分析结果可较好地解释镀有LB膜(Langmuir-Blodgett thin-film)的长周期光纤光栅的谐振波长与膜厚之间的关系。分析研究表明．通过减小纤芯直径和改变芯与包层折射率差等方法可调整光纤光栅的谐振波长，使其从一般光纤光栅谐振波长所处的近红外区转到可见光区，以利于光纤光栅配套仪器系统的调试并使系统成本降低，从而为长周期光纤光栅传感技术的发展和应用奠定基础。

Abstract: This paper theoreticall analyes spectral characteristics of the resonant wavelength of long-period fiber gratings varying with the change of the ambient refractive index in detail.The analytical results agree with the relationship between the thickness of the film and the resonant wavelength of long-period fiber grating with Langmuir-Blodgett thin-film overlay well.