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基于遗传算法设计了斜边三角形光纤光栅 (EFBG)的折射率调制函数 ;提出了光纤外径沿轴向变化、在拉应力下可获得可调谐的斜边三角形光纤光栅 ;计算分析了该器件多个物理参量对反射光谱的影响。在实验中 ,采用紫外激光扫描辐照方法 ,制备了短波边斜边带宽为 0 .7nm、反射率为 96 %的斜边三角形光纤光栅 ;采用程序控制氢氟酸腐蚀方法获得外径从原始 6 2 .5 μm减小到 4 5 μm、在 85mm长度内按设计要求变化的光纤光栅。对该光纤光栅施加从 0到 1.715N变化的拉力时 ,其反射光谱短波边的斜边带宽从 0 .7nm增加到 2 .3nm ,实现了一种带宽大范围可调的斜边光纤光栅。
Based on the genetic algorithm, the refractive index modulation function of the hypotenuse triangular fiber grating (EFBG) is designed. The fiber outer diameter along the axial variation is proposed, and the tunable beveled triangular fiber grating can be obtained under the tensile stress. Influence of Physical Parameters on Reflectance Spectra. In the experiment, a beveled triangular fiber grating with a short-wave hypotenuse bandwidth of 0.7 nm and a reflectivity of 96% was prepared by ultraviolet laser scanning radiation method. The hydrofluoric acid-based etching method was used to obtain the outer diameter of 6 2.5 μm to 45 μm, fiber gratings that vary in design over 85 mm length. When a tensile force varying from 0 to 1.715 N is applied to the fiber grating, the bandwidth of the hypotenuse on the short wavelength side of the reflection spectrum is increased from 0.7 nm to 2.3 nm, which achieves a wide range of bevel fiber Bragg grating with adjustable bandwidth.