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Proceedings Paper

Tunable filters using AlGaAsSb/AlGaInAs type-II quantum wells
Author(s): Gerhard Roesel; Markus Grau; Ralf Meyer; Markus-Christian Amann
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Paper Abstract

Tunable filters are indispensable elements for tunable laser diodes, which provide an electronic control of the emission wavelength by exploiting the free-carrier plasma effect. A tunable filter consists of a combination of tuning region that forms a waveguide core and a Bragg grating for the wavelength-selective feedback. By injection of carriers into the tuning region, the refractive index and, thus, the Bragg wavelength can be decreased. Thereby, it is obvious that the maximum tuning range depends on the achievable carrier density in the tuning region. In this paper, a type-II diode is presented, which shows an improved carrier density-current characteristic. This is achieved by spatial separation of electrons and holes, which in turn leads to a suppression of carrier recombination. Since high carrier densities can be achieved at comparatively low injection currents, type-II superlattices are particularly well suited for application as tuning region in tunable filters. They have the potential to double the tuning range that is presently achievable using bulk tuning layers.

Paper Details

Date Published: 14 June 2004
PDF: 9 pages
Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); doi: 10.1117/12.528839
Show Author Affiliations
Gerhard Roesel, Technische Univ. Muenchen (Germany)
Markus Grau, Technische Univ. Muenchen (Germany)
Ralf Meyer, Technische Univ. Muenchen (Germany)
Markus-Christian Amann, Technische Univ. Muenchen (Germany)

Published in SPIE Proceedings Vol. 5350:
Optical Components and Materials
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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