Laming, R.I., Zervas, M.N. and Payne, D.N.
54dB gain quantum-limited erbium-doped fibre amplifier
At ECOC: 18th European Conference on Optical Communication, Germany.
27 Sep - 01 Oct 1992.
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It is shown that for practical pump powers ( 33dB) and low noise figure (3dB) cannot simultaneously be achieved with a conventional co-directionally-pumped EDFA. However, using a composite EDFA incorporating an isolator overcomes the problem and we demonstrate an amplifier with 51dB (54dB) gain and 3.1dB NF for only 45mW (93mW) of pump power.
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