中国激光, 2012, 39 (s1): s105002, 网络出版: 2012-05-28
π相移光纤光栅制作方法的比较研究 下载: 620次
Comparison Study on π Phase-Shifted FBG′s Fabrication Methods
光栅 分布反馈光纤激光器 π相移光纤光栅 相位掩膜板 gratings distributed feedback fiber laser phase-shifted fiber Bragg grating phase mask
摘要
介绍了目前最常用的两种制作相移光纤光栅的方法,即分步曝光法(或遮挡法)和相位掩膜板移动法,对比分析了两种方法引入相移的物理机制,并利用传输矩阵法理论模型,数值模拟了两种制作方法下的相移光纤光栅透射谱,并分别进行了分布反馈光纤激光器(DFB-FL)的对比实验。结果表明,分步曝光法制作相移光纤光栅时,相移量与光栅中无曝光段的长度及纤芯折射率调制量均有关,难以精确控制相移量的大小,并且存在偏振模竞争问题;而相位掩膜板移动法通过压电陶瓷直线微动台控制掩膜板和光纤相对位移,在光栅中引入相位变换,可以将相移量控制在0~2π范围之内,更容易实现π相移光栅的制作。
Abstract
The two most commonly used fabrication methods of phase-shifted fiber Bragg grating, namely the stepped exposure method (or shielded method) and the phase mask moving method are described. Physical mechanisms of the two methods to introduce phase shift are comparatively analyzed. Using the theoretical model of transfer matrix method numerical simulation of the transmission spectra of phase shift fiber Bragg grating is done, and cross-reference experiments are carried out. The results show that the phase shift of the grating is related to the non-exposed segments of length and core refractive index modulation amount and it′s hard to accurately control in stepped method. While the phase shift is controlled in an amount of 0~2π range and easier to achieve π phase shift grating production in phase mask moving method using Piezo nano-positioning system.
宋志强, 祁海峰, 倪家升, 张晓磊, 王昌, 彭刚定. π相移光纤光栅制作方法的比较研究[J]. 中国激光, 2012, 39(s1): s105002. Song Zhiqiang, Qi Haifeng, Ni Jiasheng, Zhang Xiaolei, Wang Chang, Peng Gangding. Comparison Study on π Phase-Shifted FBG′s Fabrication Methods[J]. Chinese Journal of Lasers, 2012, 39(s1): s105002.