| 倾斜切趾光纤光栅的理论与实验研究 |
| Theoretical and experimental study on oblique apodized fiber Bragg gratings |
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| 中文摘要: |
| 针对飞秒激光刻写均匀光纤布拉格光栅的反射主峰存在较高旁瓣，容易对主峰形成串扰的问题，开展基于倾斜切趾光纤光栅的理论与实验研究。根据飞秒激光诱导产生的折射率特点，修正耦合模模型中的交流耦合系数，并利用有限元仿真的形式，验证了倾斜切趾法的切趾类型为高斯型。之后对影响切趾效果的关键参数进行实验研究，结果表明：实验结果与仿真计算基本一致；初始横向位移为5~10 μm，且不对称偏移量小于±2 μm时，边模抑制比可提高到15 dB。研究成果为提高光纤光栅边模抑制比提供了重要理论支撑与实践指导，对于推动光纤光栅制备工艺技术发展具有重要意义。 |
| 英文摘要: |
| The theoretical and experimental research based on the oblique apodized fiber Bragg gratings (FBG) is carried out, in order to solve the crosstalk to the main peak from the high reflected sidelobe of the uniform fiber Bragg gratings written by femtosecond laser point-by-point. According to the characteristics of the refractive index induced by femtosecond laser, the AC coupling coefficient in the coupled mode model is modified. The apodization type of the oblique apodization method is verified to be Gaussian by finite element simulation. Then the key parameters affecting the apodization effect are studied experimentally. The results show that the experimental results are basically consistent with the simulation results, and when the initial lateral displacement is between 5 μm and 10 μm and the asymmetric offset is less than ± 2 μm, the side mode suppression ratio can be improved to 15 dB. The research results provide important theoretical support and practical guidance for improving the side mode suppression ratio, and are of great significance for promoting the development of fabrication technology of FBG. |
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| 中文关键词: 飞秒激光 切趾光纤光栅 边模抑制比 |
| 英文关键词:femtosecond laser apodized fiber Bragg grating side mode suppression ratio |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2022.05.14 |
| 引用本文：张鹏浩, 陈爽, 武洪波.倾斜切趾光纤光栅的理论与实验研究[J].计测技术,2022,(5):. |
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