Gizatulin Azat, Meshkov Ivan, Vinogradova Irina, Bagmanov Valery, Grakhova Elizaveta, Sultanov Albert
Department of Telecommunications, Ufa State Aviation Technical University, 450008 Ufa, Russia.
Sensors (Basel). 2020 Sep 18;20(18):5345. doi: 10.3390/s20185345.
In this paper, we consider the process of fiber vortex modes generation using chiral periodic structures that include both chiral optical fibers and chiral (vortex) fiber Bragg gratings (ChFBGs). A generalized theoretical model of the ChFBG is developed including an arbitrary function of apodization and chirping, which provides a way to calculate gratings that generate vortex modes with a given state for the required frequency band and reflection coefficient. In addition, a matrix method for describing the ChFBG is proposed, based on the mathematical apparatus of the coupled modes theory and scattering matrices. Simulation modeling of the fiber structures considered is carried out. Chiral optical fibers maintaining optical vortex propagation are also described. It is also proposed to use chiral fiber-optic periodic structures as sensors of physical fields (temperature, strain, etc.), which can be applied to address multi-sensor monitoring systems due to a unique address parameter-the orbital angular momentum of optical radiation.
在本文中，我们考虑了利用包含手性光纤和手性（涡旋）光纤布拉格光栅（ChFBG）的手性周期结构来产生光纤涡旋模式的过程。建立了ChFBG的广义理论模型，该模型包含变迹和啁啾的任意函数，为计算在所需频带和反射系数下产生具有给定状态涡旋模式的光栅提供了一种方法。此外，基于耦合模理论和散射矩阵的数学工具，提出了一种描述ChFBG的矩阵方法。对所考虑的光纤结构进行了模拟建模。还描述了维持光学涡旋传播的手性光纤。还建议将手性光纤周期结构用作物理场（温度、应变等）的传感器，由于独特的地址参数——光辐射的轨道角动量，可将其应用于多传感器监测系统。
