Vodhanel, R.S., Laming, R.I., Shah, V., Curtis, L., Bour, D.P., Barnes, W.L., Minelly, J.D., Tarbox, E.J. and Favire, F.J.
Highly efficient 978nm diode-pumped erbium-doped fiber amplifier with 24dB gain
Electronics Letters, 25, (20), . (doi:10.1049/el:19890928).
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We report an Er3+-doped fibre amplifier pumped with a strained GaInAs/AlGaAs quantum-well diode laser operating at 978 nm. Efficient optical coupling of the diode laser pump was achieved with a wedge-tipped fibre. An optical gain of 24dB at 1535nm was obtained with only 6.2mW of pump power, corresponding to a gain of 3.9dB/mW of pump power. This is the highest efficiency for a fibre amplifier achieved thus far.
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