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Broadband,high bit rate,long hauls and system intelligence are current trends in developing fiber optic communication systems.The ever-increasing traffic demands have made it urgent to develop new band optical fiber amplifier.Laser characteristics of various rare-earth ion including Er~(3+),Tm~(3+),Pr~(3+),Dy~(3+),Ho~(3+),and Nd~(3+) doped fiber are reviewed.Recent advances of rare-earth doped fiber amplifiers with wide-band and flat gain are also introduced.
Broadband, high bit rate, long hauls and system intelligence are current trends in developing fiber optic communication systems. The ever-increasing traffic demands have made it urgent to develop new band optical fiber amplifier. Laser characteristics of various rare-earth ion including Er ~ (3 +), Tm ~ (3 +), Pr ~ (3 +), Dy ~ (3 +), Ho ~ (3 +), and Nd ~ (3+) earth doped fiber amplifiers with wide-band and flat gain are also introduced.