阵列光栅刻写中光纤滑动规律探索及解决

摘要

A kind of novel fabrication system of array optical fiber gratings is proposed and multi-wavelength array optical fiber gratings are obtained on 8-core ribbon optical fiber through this structure with only one phase mask. By means of image processing, the dynamic images are collected during the array gratings fabrication and the relative pixel shifts are monitored, and then fiber slip regulation are analyzed and obtained. In order to resist the influence of fiber slip, the specially-designed fixture is designed, and the material and shape of the clamping surface are improved many times. The experiment results show that the macrobending surface of the clamping surface can not only fix the ribbon optical fiber, but also keep the coating in good condition. We successfully obtained array optical fiber Bragg gratings with 0.2 nm bandwidth, wavelength interval less than 0.5 nm, wavelength deviation less than 0.05 nm and reflectivity more than 80% on ribbon optical fiber by the above system.%设计了一套带状光纤阵列光栅的刻写系统，仅利用单一相位模板，就能实现单层带纤上8个不同谐振波长阵列光栅的刻写。借助图像处理的手段，采集刻栅过程中光纤位移的动态图像，以图像中对应像素点的移动情况为检测对象，对光纤滑动现象进行分析，从而掌握光纤滑动规律。为抵抗光纤滑动的影响，自行设计了专用带纤夹具，并对夹持面的材料和结构进行多次改进，实验结果表明，宏弯结构夹持面既能夹持和固定带纤，又能保证带纤涂覆层完整。本研究实现了3 dB带宽0.2 nm、波长间隔0.5 nm、波长偏差小于±0.05 nm、反射率达80%以上的阵列布拉格光纤光栅的刻写。