分析了分布反馈光纤激光器的声波敏感机理, 发现阻断“弦”结构对声振动的传递和响应是隔声隔振封装工艺的关键.根据分析设计了一种主体为弧形中性轴线槽的封装结构, 分布反馈光纤激光器有源相移光栅在一定预拉力下粘结固定在封装结构的槽中, 光栅各点均贴附在弧形平面上.实验结果表明, 这种结构有效消除了声致弯曲等效应的影响, 使激光器窄线宽特性在外界声波和振动冲击下能够得到良好保持.同时, 实现了激光波长大范围的温度调谐, 波长温度调谐系数由10 pm/℃提高到30 pm/℃以上, 且激光器输出性能稳定.

The acoustic sensitivity mechanism of distributed feedback fiber laser was analyzed. The key technology of acoustic isolation and vibration isolation is to blocking-up the tranfer and impact to the structure of string. According to the analysis results, a packaging structure of the main body for the arc neutral axis slot was designed. The active phase shifted fiber Bragg grating of distributed feedback fiber laser is fixed in the slot of the package structure under a certain pre-tension. The fiber Bragg grating is attached to each point on the curved plane. The experimental results show that the effect of sound bending and other effects are effectively eliminated by the proposed structure. Laser line-width will not be broadened under acoustic and vibration shock. Moreover, the wavelength temperature tuning coefficient is increased from 10 pm/℃ to 30 pm/℃, the output performance of distributed feedback fiber laser is stable.