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Fiber Bragg Grating (FBG)

Fiber Bragg Grating (FBG) is one of the most popular optical fiber sensing technologies. Bragg grating is written into a segment of Ge-doped single-mode fiber in which a periodic modulation of the core refractive index is formed by exposure to a spatial pattern of ultraviolet (UV) light.

According to Bragg’s law, when a broadband source of light has been injected into the fiber, FBG reflects a narrow spectral part of light at certain wavelength, which is called the Bragg wavelength and dependent on the grating period and the refractive index of fiber.