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Control of differential gain, nonlinear gain and damping factor for high-speed application of GaAs-based MQW lasers

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7 Author(s)
Ralston, J.D. ; Fraunhofer-Inst. fuer Angewandte Festkorperphysik, Freiburg, Germany ; Weisser, S. ; Esquivias, I. ; Larkins, E.
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Utilizing small-signal direct modulation and relative intensity noise measurements, the authors investigate changes in the modulation response, the differential gain ∂g/∂n, the nonlinear gain coefficient ∈, and the damping factor K, which result from three structural modifications to GaAs-based multiple quantum well lasers: the addition of strain in the quantum wells; and increase in the number of quantum wells; and the addition of p-doping in the quantum wells. These modifications are assessed in terms of their potential for reducing the drive current required to achieve a given modulation bandwidth, for increasing the maximum intrinsic modulation bandwidth of the laser, and for improving the prospects for monolithic layer/transistor integration. It has been possible to simultaneously increase δgn and decrease K, yielding very efficient high-speed modulation (20 GHz at a DC bias current of 50 mA) and the first semiconductor lasers to achieve a direct modulation bandwidth of 30 GHz under DC bias

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Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 6 )