基于悬臂梁的光纤光栅无啁啾线性调谐

No Chirped Linearly Tuning Technique for Fiber Bragg Grating with a Cantilever Beam

设计了一种均质、等厚、等腰三角状悬臂梁，调节该梁自由端的挠度，实现了光纤光栅布拉格反射中心波长的线性无啁啾调谐（调谐范围４．５０ｎｍ）。引入修正因子η＝０．７１后，理论值与实验结果基本一致。光栅与梁间刚性粘贴的质量影响反射谱形状。

A kind of uniform density and thickness isosceles triangle cantilever beam is designed to realize linear tuning of Bragg wavelength of fiber grating without chirping by adjusting the deflection of the free end that is the vertex part of the triangle. The tuning is demonstrated experimentally within the range of 4.5 nm. After introducing a correction index η= 0.71, experimental results agree with the theoretical value. The form of the reflected spectrum is related to the quality of pasting between fiber Bragg grating and the beam.