分析了基于弹性梁的光纤光栅调谐原理,引入了轴向应变传递系数的概念,提出利用部分纯弯曲调谐方法,可实现光纤光栅宽带无啁啾调谐。在实验中,利用部分纯弯曲调谐法,获得了20.1 nm的光纤光栅无啁啾调谐范围,调谐线性拟合度为0.9996,调谐过程中光栅反射谱的3 dB带宽变化小于0.07 nm,峰值反射率变化小于0.2dB,基本无啁啾现象产生,实验结果和理论分析一致。 The principle of FBG tuning based on elastic beam is analyzed, and the concept of axial strain transfer coefficient is introduced. The proposed method is based on the partially pure bending tuning method, which can realize broadband chirp tuning without tuning. In the experiment, the tuning range of the 20.1 nm FBG was obtained with partial pure bending tuning, the linearity of the tuning was 0.9996, the variation of the 3 dB bandwidth of the grating reflected spectrum was less than 0.07 nm during tuning, and the peak reflectivity The change is less than 0.2dB, basically no chirp phenomenon, the experimental results and theoretical analysis.