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提出了一种新型的光纤光栅的中心波长与带宽独立调谐的方法。将光纤布拉格光栅(FBG)粘贴于圆环形薄壁截面梁的外表面,通过旋转圆环形薄壁截面梁,即相当于改变光纤光栅的位置来实现中心波长与带宽的独立调谐。实验上得到了6.706 nm准无啁啾的中心波长调谐和5.368 nm的准无中心波长漂移的最大带宽调谐,并且此中心波长和带宽调谐均与拉力呈线性关系,实验结果与理论分析一致。
A new method of tuning the center wavelength and bandwidth of fiber grating is proposed. The fiber Bragg grating (FBG) is pasted on the outer surface of a circular thin-walled section beam and the center wavelength and the bandwidth are independently tuned by rotating a circular thin section beam, which is equivalent to changing the position of the fiber grating. The experimental results show that the center wavelength tuning of 6.706 nm and the maximum bandwidth tuning of 5.368 nm with no center wavelength drift are obtained. The center wavelength and bandwidth tuning are linear with the pulling force, and the experimental results are consistent with the theoretical analysis.