Regenerated Fiber Bragg Gratings in Large Mode Area Fibers for High-Temperature Sensing

Research on the formation mechanism of regenerative fiber Bragg grating based on non-uniform crystallization in fiber Bragg grating

“…RFBG has attracted significant attention due to its ability to be applied in hightemperature environments. To obtain optimized production processes and application technologies, research on regeneration mechanisms has always been a focus and has attracted attention [2][3][4]. So far, several formation mechanisms have been proposed, such as the chemical composition grating theory proposed by M. Fokine [5] and the stress relaxation theory proposed by J. Canning [6], etc.…”

Spectral power stabilization against temperature variations in multimode fiber Bragg gratings

“…9) FBGs are widely recognized as one of the most fundamental optical devices and have a wide range of practical applications in communication and sensing. In fact, various types of FBGs, such as regenerated FBGs, 10,11) microstructure FBGs, 12) and tilted FBGs, 13) have been developed for hightemperature, refractive index, strain, pressure, acoustic wave, and other applications. [14][15][16][17] When fiber gratings are inscribed in single-mode fibers (SMFs), they reflect only a single wavelength of light, known as the Bragg wavelength λ = 2 • n eff • Λ, where n eff represents the effective refractive index of the fiber core and Λ denotes the grating pitch.…”