Numerous parameters which are the parameters of the erbium doped fiber amplifier edfa and the fiber raman amplifier fra define the gain spectrum of a hybrid edfa fra. 1 7 gb s at 50km 1989 erbium doped fiber amplifier 1990s 1 55 um ingaasp dfb lasers smf 2 5 10 gb s at 40km 1990s wdm. Pp is the pump power g ω is the gain coefficient units of cm 1 a p is the cross sectional area of the pump beam in the fiber.
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