Parasitic-free study of carrier transport in asymmetric 1.55 /spl mu/m MQW laser structures

R. Zimmermann, S. Kramer, F. Steinhagen, H. Hillmer, H. Burkhard, A. Hangleiter
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Abstract

Carrier transport is supposed to be one of the major limiting processes for the high speed dynamics of SCH-MQW laser structures. It contributes to gain compression in addition to phenomena like spectral holeburning or carrier heating. The carrier transport effect also shows its influence in an RC-like rolloff of the high frequency response of laser devices. This reduction in bandwidth has been studied in the past to overcome transport problems in finding the appropriate structure, It has been proposed that it is mostly the slow transport of the heavier holes which limits the laser bandwidth. In this paper we have studied the phenomenon of carrier transport by investigating two asymmetric confined laser structures, using a parasitic-free optical modulation method. This made it possible to measure the apparent carrier transport time not only in total but for each side of the confinement layer. Finally we result in a diffusion constant for the barrier/confinement carriers in InGaAlAs material which is in good agreement with reported mobilities.
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非对称1.55 /spl μ m MQW激光结构中载流子输运的无寄生研究
载流子输运被认为是SCH-MQW激光结构高速动力学的主要限制因素之一。除了光谱烧孔或载流子加热等现象外,它还有助于压缩增益。载流子输运效应对激光器件高频响应的类rc滚降也有影响。这种带宽的减少在过去已经被研究过,以克服在寻找合适结构时的输运问题。有人提出,主要是较重空穴的慢输运限制了激光带宽。本文采用无寄生光调制方法,研究了两种非对称受限激光结构的载流子输运现象。这使得不仅可以测量总的表观载流子输运时间,而且可以测量约束层每边的表观载流子输运时间。最后,我们得出了InGaAlAs材料中势垒/约束载流子的扩散常数,该常数与报道的迁移率很好地一致。
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