Abstract

Erbium-doped fiber amplifiers (EDFA) have been attracting great attention in past couple of years for its prospect to be utilized in telecommunication area in an early stage, and various investigations have already been made on this subject. And they have revealed many advantages of EDFA such as low insertion loss, high amplifier gain (>40dB), good noise figure (approx. 3dB), polarization insensitivity (<1dB), high saturation output power (>10dB), and wide bandwidth. It seems that more attention has been payed for the application as preamplifiers that high gain and high efficiency is needed for the purpose.

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