Abstract
An extremely large 3-dB gain-bandwidth of 75 nm (1531-1606 nm) is achieved employing partially gain-flattened erbium-doped fluoride fiber amplifiers and Raman amplification in the transmission fibres. 9/spl times/2.5 Gb/s WDM transmission is successfully demonstrated using our amplifiers as an in-line- and pre-amplifiers.
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