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At most efficient pump wavelength, a praseodymium-doped In-Ga-based fluoride fiber is directly pumped by four 0.98-/spl mu/m-band laser diodes. These lasing wavelengths are detuned from 0.98 to 1 /spl mu/m by external selective optical feedback from fiber grating reflectors. Maximum signal output power of +13.5 dBm is obtained at 1.296 /spl mu/m. Four-wavelength multiplexed signals at 1.296-1.311 /spl mu/m are amplified with a deviation of gain less than 1.9 dB. By using the amplifier as a power booster, data of 2.5 Gb/s is successfully transmitted more than 100 km.