Abstract

ABSTRACT Carrier transport can significantly affect the high speed propeities of quantum well lasers. We have &xeloped amodel, and derived analytical expressions for the modulation response, resonance frequency, damping rale and K fftw toinclude these effects. We show theoretically and expenmentally that carrier transport can lead to significan low frequency parasitic-like rolloff that reduces the modulation response by as much as a ftor of six in quantum well 1ars. We also show that, in addition, it leads to a reduction in the effective differential gain and thus the resonance frequency, while thenonlinear gain compression ftor remains largely unaffected by it. In the presence of significant transport effects, we show that the real limit to the maximum possible modulation bandwidth is much lower than the one predicted by the K factor alone. 1. INTRODUCTION Quantum well lasers have been theoretically and experimentally shown to have a larger differential gain than bulklasers1 , but the modulation bandwidths reported in quantum well lasers have only recently been comparable to bulk

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