This article presents the effect of fiber Bragg gratings side lobes on interrogation systems consisting of sensor and matched filters. The conducted research shows that high-value side lobe structures applied as sensors and/or filters are characterized by some interesting properties. The paper presents both numerical analysis and experimental verification of the fiber Bragg gratings (FBG) interrogation systems with matched filters for gratings containing high side lobes. Numerical modeling of Bragg structures was performed for two different cases: uniform and inverse apodization. Modification of apodization can change the side lobe reflectance level even above levels found in uniform structures. This is a case not described in the literature, especially in terms of possible applications. Transfer characteristics, i.e., the relationship between power intensity as a function of wavelength shift, were determined. A collection of gratings with spectra corresponding to those analyzed in numerical experiments were fabricated. Next, the transfer characteristics of the interrogation systems containing real FBG were determined. The properties of the proposed systems are described. It has been shown that a significant level of sidebands, which is often the subject of many drawbacks in filtering or telecommunications systems, can be an advantage. It has been demonstrated that a high level of side lobes can be used to increase the measurement range of the FBG sensor interrogation systems. It has been determined numerically and confirmed experimentally that from the point of view of the design of sensor interrogation systems, it is beneficial to combine specific pairs of gratings: one with a spectrum characterized by a low side lobe level and a second one in which the spectrum has very high side lobes.

中文翻译：

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大旁瓣的FBG传感器匹配滤波器询问的数值和实验分析

本文介绍了布拉格光纤光栅旁瓣对由传感器和匹配滤波器组成的询问系统的影响。进行的研究表明，用作传感器和/或滤波器的高价值旁瓣结构具有一些有趣的特性。本文介绍了带有匹配滤波器的光纤布拉格光栅（FBG）询问系统的数值分析和实验验证，该滤波器用于包含高旁瓣的光栅。对两种不同情况进行了布拉格结构的数值建模：均匀和反切趾。切趾的改变甚至可以改变旁瓣反射率水平，甚至高于均匀结构中的水平。这是文献中未描述的情况，尤其是在可能的应用方面。传递特性，即 确定了功率强度与波长偏移之间的关系。制作了具有与数值实验中分析的光谱相对应的光谱的光栅集合。接下来，确定包含真实FBG的询问系统的传输特性。描述了所提出系统的性质。已经表明，通常在过滤或电信系统中许多缺点的主题的显着水平的边带可能是一个优点。已经证明，可以使用高水平的旁瓣来增加FBG传感器询问系统的测量范围。从传感器询问系统的设计角度来看，已经进行了数值确定和实验验证，