Department of Optics and Photonics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Laboratory of Optical Fiber Technology, Maria Curie-Sklodowska University, pl. M. Curie-Sklodowskiej 3, 20-031 Lublin, Poland.
Sensors (Basel). 2019 Jan 21;19(2):433. doi: 10.3390/s19020433.
We performed an experimental analysis of the effect of phase mask alignment on the Bragg grating reflection spectra around the wavelength of = 1560 nm fabricated in polymer optical fiber by using a multiple order phase mask. We monitored the evolution of the reflection spectra for different values of the angle ϕ by describing the tilt between the phase mask and the fiber. We observed that the peak at is split into five separate peaks for the nonzero tilt and that separation of the peaks increases linearly with ϕ. Through comparison with theoretical data we were able to identify the five peaks as products of different grating periodicities, which are associated with the interference of different pairs of diffraction orders on the phase mask.
我们使用多级相位掩模对聚合物光纤中 = 1560nm 附近的布拉格光栅反射光谱进行了相位掩模对准对其影响的实验分析。我们通过描述相位掩模与光纤之间的倾斜度，监测了不同 ϕ 值下反射光谱的演化。我们观察到，对于非零倾斜角，在 处的峰值分裂成五个单独的峰值，并且峰值的分离与 ϕ 呈线性增加。通过与理论数据的比较，我们能够将这五个峰值识别为不同光栅周期的产物，这与相位掩模上不同衍射级对的干涉有关。
