Abstract
The effects of detuning on the linewidth enhancement factor alpha are theoretically investigated for InGaAs/InGaAsP compressive-strained QW lasers. The relationship among the material gain, the Kramers-Kronig transformed differential gain, and the linewidth enhancement factor is calculated taking into account the effect of compressive strain on the valence subband structure and of p-type modulation doping. It is shown that compressive strain and/or p-type doping significantly reduces the alpha factor. It is also demonstrated that chirpless operation wherein alpha =0 can be achieved in a modulation-doped compressive-strained structure by using detuning.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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