Fiber Bragg Grating (FBG)

A Fiber Bragg Grating is a periodic or aperiodic perturbation of the effective refractive index in the core of an optical fiber. The perturbation is approximately periodic over a certain length of e.g. a few millimeters or centimeters, and the period is of the order of hundreds of nanometers. This leads to the reflection of light propagating along the fiber in a narrow range of wavelengths, for which a Bragg condition is satisfied.
A fiber Bragg grating reflects the selected wavelength and transmits others. A fiber Bragg grating can therefore be used as an inline optical filter to block certain wavelengths, or as a wavelength-specific reflector.

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