Abstract
Previous time resolved measurements of transmission in an InGaAsP optical amplifier1 have resolved a downward transient with a characteristic recovery time of ~0.7 ps which was associated with carrier heating. A second transient with a 200-fs recovery time was also observed, again for all drive currents. In the regime of gain, this latter transient remained upward, which indicated that the carrier heating effect was dominating any spectral hole burning. We have also observed a femtosecond transient in our measurements but with a sign that mimics the change in transmission associated with the carrier density changes, and therefore suggests that spectral hole burning is more significant in our experiment.
© 1992 Optical Society of America
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