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High gains have been reported in 980 nm-pumped Erbium doped fiber amplifier modules at low pump power (1). However it has been widely observed that 20% to 40% of the pump power is lost at the splice between the Erbium doped fiber and the WDM coupler mixing the pump and the signal waves. Various methods have been proposed for reducing the splice loss at this point (2-5).
© 1992 Optical Society of America
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