Gain equalization of FM-EDFA by optimizing ring doping and mode ...

We investigate gain equalization of a four-mode-group and six-mode-group erbium-doped fiber amplifiers with a genetic<br>algorithm for mode division multiplexing transmission systems by optimizing rare earth dopant profile and pump modes<br>powers, respectively. The optimizing gains are calculated to be > 28 dB between 1520 nm – 1565 nm with a maximum<br>differential modal gain of ~ 2 dB among the mode groups only by optimizing the rare earth ring doping profile in the<br>few-mode erbium