In this paper we study tbe design and performance of 980 run single pumped tandem Recycled Erbium Amplifier Pump (REAP) configurations. These configurations feature high gain (>40 dB) and low noise figure (3 dB) using an isolator incorporated in the amplifier length to block backward traveling amplified spontaneous emission (ASE) from degrading the amplifier performance. In particular, we investigate theoretically the trade offs between gain and noise figure and their dependency on fiber length, signal level and pump power. First, using the ratio between first stage length and total amplifier length as a figure of merit, we determine the optimum position of the isolator to achieve a combination of high gain and low noise figure, for constant levels of pump power in the small signal regime. Then, we calculate tbe amplifier performance for applications as power booster, in-line amplifier and preamplifier.
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