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We describe time-resolved chirp measurements in InAs∕InP quantum-dash optical amplifiers operating at 1550 nm. We highlight the roles of gain saturation and of the saturating pulse duration relative to the gain recovery time. Using 10Gbit∕s data, we demonstrate a low transient α parameter of less than one which causes negative chirp at the leading edge and positive chirp during the trailing edge of the input pulse.
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Hadass et al. (2005) studied this question.
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