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Proceedings Paper

Carrier and photon dynamics in transversally asymmetric high-speed AlGaAs/InP MQW lasers
Author(s): Hartmut Hillmer; A. Greiner; F. Steinhagen; Herbert Burkhard; R. Loesch; Winfried Schlapp; Thomas Kuhn
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Paper Abstract

Carrier transport and carrier capture were reported to markedly influence the carrier and photon dynamics in quantum-well semiconductor lasers and to limit the modulation bandwidth. Recently, model calculations of various degrees of complexity have isolated special aspects of the problem. We given an extended overview and report on our theoretical and experimental results on 1.55 micrometer AlGaInAs/InP lasers with strongly asymmetric transversal waveguide structures. The self-consistent solution of the Poisson and continuity equations is based on measured carrier mobilities and not only limited to the confinement region. The confinement factor is pointed out to be important when comparing different asymmetric structures. The use of optimized asymmetric structures is demonstrated theoretically and experimentally to enable a distinct improvement in modulation bandwidth and to counteract the limiting physical processes such as carrier transport and carrier capture-escape. Finally, the influence of the shape of the longitudinal carrier and photon density profiles on the modulation behavior is studied. We found that a better homogenization of these profiles for transversally optimized structures may slightly increase the bandwidth. This is further confirmed experimentally by comparing lasers of different profiles applying chirped DFB gratings implemented by bent waveguides.

Paper Details

Date Published: 1 May 1996
PDF: 17 pages
Proc. SPIE 2693, Physics and Simulation of Optoelectronic Devices IV, (1 May 1996); doi: 10.1117/12.238971
Show Author Affiliations
Hartmut Hillmer, Deutsche Telekom (Germany)
A. Greiner, Univ. Stuttgart (Germany)
F. Steinhagen, Technische Hochschule (Germany)
Herbert Burkhard, Deutsche Telekom (Germany)
R. Loesch, Deutsche Telekom (Germany)
Winfried Schlapp, Deutsche Telekom (Germany)
Thomas Kuhn, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 2693:
Physics and Simulation of Optoelectronic Devices IV
Weng W. Chow; Marek Osinski, Editor(s)

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