Here we optimize the length er 3 concentration and pump power and wavelength of the edfa and also pump powers and wavelengths of the fra to obtain the flattest operating gain spectrum. Optical fiber communication lecture 8 fiber amplifiers from the movie warriors of the net erbium doped fiber amplifier erbium atom energy levels lifetime and. The core of a silica fiber is doped with trivalent erbium ions er 3 and can be efficiently pumped with a laser at or near wavelengths of 980 nm and 1480 nm and gain is exhibited in the 1550 nm region.
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