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Fast, very low threshold optical pulse switching, in a nonlinear loop mirror incorporating an erbium doped fibre amplifier (EDFA) operating at 1.536 μm with a gain of 46 dB is reported. For a 336 m Sagnac loop, the input switching power is 200 μW, which is 5×103 lower than the best previously reported.
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Richardson et al. (1990) studied this question.
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