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. A fiber Bragg grating can therefore be used as an inline optical filter to block certain wavelengths, or as a wavelength-specific reflector.

●  Small size;

●  Good wavelength selectivity;

●  Large bandwidth Range;

●  Insensitive to polarization;

●  Easy connection with optical fiber system, small additional loss, good coupling.

●  Communications；

●  Fiber Bragg grating sensors;

●  Fiber Bragg gratings used in fiber lasers;

●  Process of matching active and passive fibers.