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We describe the pulse-amplification characteristics of an erbium-doped fiber amplifier and nonlinear loop mirror combination. The low switching power (less than a milliwatt peak) afforded by high amplifier gain and long loop length has permitted the efficient amplification (17 dB) and intensity filtering of mode-locked semi-conductor laser pulses. In addition, saturation of the amplifier gain is shown to result in amplification and shaping characteristics that are remarkably insensitive to the input power.
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Smith et al. (1992) studied this question.
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