In this paper, the sensing principle of FBG packaged was developed, and then the packaging technology for FBGs and the embedding technique based on the red copper were studied, and the sensing properties of FBG before and after packaged were theoretically and. In this paper, the sensing principle of FBG packaged was developed, and then the packaging technology for FBGs and the embedding technique based on the red copper were studied, and the sensing properties of FBG before and after packaged were theoretically and. The sensing principle of FBG packaged was developed, and packaging technology for fiber Bragg gratings (FBGs) and the embedding technique were studied. A scheme of packaging technology using the red copper slice for FBGs was presented, and experimental results indicate that the strain sensitivity. Theoretical and experimental investigation of a technique for creating a package for the passive temperature compensation of a fiber Bragg grating is presented. The aim is the development of and research on the fiber Bragg grating packaging technique for passive temperature. This Special Issue “Fiber Bragg Gratings: Fundamentals, Materials and Applications” will concentrate on all aspects of fundamental and applied research with a particular focus on photonics. Both, original research papers, as well as review papers, are welcome.