基于两端固定压杆的光纤布拉格光栅波长调谐

Wavelength Tuning of Optical Fiber Grating Based on Two-Fixed-End Elastic Compressive Bar

提出了一种基于两端固定压杆的新型光纤布拉格光栅(FBG)波长调谐方法。根据材料力学对基于两端固定压杆的光纤光栅波长调谐进行了理论推导,仿真并重点分析了在调谐过程中谐振峰产生的原因。利用自行设计的调谐装置进行了FBG波长调谐实验,波长调谐量与移动平台位移量成指数关系,实现了FBG波长的双向准无啁啾调谐量35 nm,调谐过程中3 dB带宽的改变量小于0.09 nm。调谐过程具有很好的重复性,迟滞误差为0.08%。

A novel tunable wavelength filter is designed and demonstrated,which is realized by bending a fiber Bragg grating（FBG） mounted on a two-fixed-end elastic compressive bar.According to material mechanics,equations relating the wavelength tuning of FBG to the bending strain are derived.The resonant peaks during tuning process are simulated and analyzed in detail.FBG wavelength tuning experiments are carried out by using self-designed tuning apparatus.The wavelength change has a strictly exponential relation with the displacement of the translation stage.The experimental tuning range is greater than 35 nm and the 3 dB bandwidth change is less than 0.09 nm. The tuning has a repeatability with hysteresis of 0.08%.