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Transient Pulse-Response of InGaAs/InGaAsP Distributed Feedback Lasers for Multigigabit Transmission Systems

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Abstract

Optical excitation with picosecond pulses is used to investigate high frequency modulation properties of distributed feedback (DFB) lasers. Typical time constants like the rise and fall time and the full width at half maximum of the laser response were investigated. We show that intrinsic carrier dynamics mainly determine the transient behavior of the lasing pulse. A theoretical analysis of a 3 level system considering carrier dynamics yields coupled rate equations, which are appropriate for a description of the experiments. Furthermore spectral characteristics of DFB lasers in the picosecond time scale is analyzed with respect to multi- and single mode operation.

© 1993 Optical Society of America

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