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Proceedings Paper

Frequency tuning of a double-heterojunction AlGaAs/GaAs vertical-cavity surface-emitting laser by a serial integrated modulator diode
Author(s): Claire F. Gmachl; Anton Koeck; Matthias Rosenberger; Erich Gornik; M. Micovic; James A. Walker
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Paper Abstract

Frequency tuning of a vertical-cavity surface-emitting laser (VCSEL) achieved through the monolithical integration of a modulator diode is reported. Current injection into the modulator diode locally changes the refractive index. This in turn leads to a shift of the Fabry-Perot- resonances of the microcavity. The experimental results show a gradient of a frequency blue- shift up to 0.93 GHz/mA by the modulator current. The maximum obtained frequency shift was 14 GHz at 15 mA modulator current. The useful tuning range is at present restricted to approximately 40 mA modulator current due to thermal effects. The onset of these effects leads to a bending over of the frequency shift from a Plasma effect dominated regime to a thermally dominated regime and in turn to a frequency red-shift. A simple theoretical model considering Plasma effect and Joule effect agrees well with the experimental data and predicts a maximum value for the gradient of frequency shift of 1.15 GHz/mA with the given structure.

Paper Details

Date Published: 19 November 1993
PDF: 7 pages
Proc. SPIE 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II, (19 November 1993); doi: 10.1117/12.162801
Show Author Affiliations
Claire F. Gmachl, Technische Univ. Muenchen (Germany)
Anton Koeck, Technische Univ. Muenchen (Germany)
Matthias Rosenberger, Technische Univ. Muenchen (Germany)
Erich Gornik, Technische Univ. Muenchen (Germany)
M. Micovic, AT&T Bell Labs. (United States)
James A. Walker, Consorzio Interuniversitario di Fisica della Materia (Italy)

Published in SPIE Proceedings Vol. 1985:
Physical Concepts and Materials for Novel Optoelectronic Device Applications II
Fabio Beltram; Erich Gornik, Editor(s)

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