倾斜Bragg光纤光栅反射谱特性理论和实验研究

Theoretical and experimental research on reflection spectrum characteristic of tilted fiber Bragg grating

光纤B ragg光栅在通信和传感领域有着广泛的应用。根据倾斜光纤B ragg光栅的结构特点,利用耦合模原理,运用传输矩阵法,模拟分析了倾斜角度对光纤B ragg光栅反射特性的影响,并用实验对模拟结果进行了验证。实验和模拟结果表明:随着倾斜角的增大,中心反射波长向长波方向移动,反射带宽变窄,反射率减小。这个结论对倾斜B ragg光纤光栅的生产和应用有一定的指导作用。

The fiber Bragg grating has a wide application in the field of communication and sensing.According to the special structure of the tilted fiber Bragg grating,the effect of the tilted angle θ on reflection spectrum of tilted fiber Bragg grating was studied by using the couplemode theory and transfer matrix.The simulation result shows that the center wavelength of reflection spectrum moves to the long-wavelength side,and the bandwidth and the reflectivity decreases with the increase of θ.The experimental result coincides with the simulation result.This conclusion is of great aid to the fabrication and application of the tilted fiber Bragg grating.