Abstract
Pumping erbium doped fiber amplifiers (EDFAs) in the 4I15/2 to 4I13/2 absorption band is attractive because excited state absorption is absent and the development of laser diode pumps can take advantage of the already advanced technology for InGaAsP 1.5-μm laser diodes.1 Recently, high gains have been achieved2-4 using laser diodes with emission spectra centered between 1.47 and 1.49 μm.
© 1990 Optical Society of America
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