A novel wideband erbium-doped fiber amplifier utilizing a bidirectional amp
lification of conventional- and long-wavelength band signals is presented.
Amplification of a four-channel wavelength-division multiplexing system (tw
o channels for each band) is successfully demonstrated with an average gain
of 20 dB and a noise figure less than 7.5 dB. (C) 2000 John Wiley & Sons,
Inc.