Gain flattening gratings are fiber Bragg Gratings that modify the relative strength of a signal distributed over a wavelength range (i.e., the gain profile of an optical amplifier).
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The gratings essentially act as wavelength selective components by blocking a predetermined portion of the signal as a function of wavelength, and redirecting it back along the core of the fiber (in a reflective mode). In the reflective mode, the fiber grating must be used in conjunction with an isolator to create a loss. The percentage of the light that is coupled into cladding or Full Text . . .
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