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A fiber Bragg grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others. This is achieved by creating a periodic variation in the refractive index of the fiber core, which generates a wavelength-specific dielectric mirror. Hence a fiber Bragg grating can be used as an inline optical filter to block certain wavelengths, can be used for sensing applications,[1] or it can be used as wavelength-specific reflector.
- ^ Gao, Wenjing; Liu, Jianxia; Guo, Huiyong; Jiang, Xin; Sun, Shaofa; Yu, Haihu (June 1, 2022). "Multi-Wavelength Ultra-Weak Fiber Bragg Grating Arrays for Long-Distance Quasi-Distributed Sensing". Photonic Sensors. 12 (2): 185–195. Bibcode:2022PhSen..12..185G. doi:10.1007/s13320-021-0635-4. ISSN 2190-7439. S2CID 237744822.