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提出了一种基于两端固定压杆的光纤光栅(FBG)啁啾度调谐的新方法,在FBG中引入线性应变,实现中心波长无移动啁啾度调谐。结合材料力学分析了FBG啁啾度调谐的原理,仿真分析了啁啾度调谐过程中的光栅反射谱和时延特性。带宽展宽调谐的实验实现了啁啾光纤光栅(CFBG)的带宽从6.52nm增加到12.78nm;而带宽压缩调谐实现了CFBG的带宽从6.57nm压缩到0.95nm。该啁啾度调谐方法在CFBG动态色散补偿以及利用CFBG的带宽信息实现温度无补偿的压力、位移等物理量的传感有着重要应用。
A new method of tuning the chirp of fiber gratings (FBGs) is proposed based on the two-end fixed pressure bar. Linear strain is introduced into the FBGs to achieve no moving chirp tuning at the center wavelength. The principle of FBG chirp tuning was analyzed in combination with the mechanics of materials. The grating reflection spectra and time delay characteristics during chirp tuning were simulated. Band broadening and tuning experiments show that the bandwidth of chirped fiber grating (CFBG) is increased from 6.52nm to 12.78nm, while bandwidth compression tuning achieves CFBG bandwidth compression from 6.57nm to 0.95nm. The chirp tuning method plays an important role in the dynamic dispersion compensation of CFBG and the sensing of physical quantities such as pressure and displacement without temperature compensation using the bandwidth information of CFBG.