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Fiber bragg gratings (FBGs)
     
 
     
 
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A photosensitive optical fiber that contains a periodic grating (an area
of multiple stripes extending through the crosssection of the fiber, the distance between each stripe defining the period of the grating) written into the core of the fiber by exposure to UV radiation. The central wavelength reflected can be changed by altering the period length. Bragg gratings are used as filters for specific wavelengths or bands of light.


 
     
 
 
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