Tunable filters using AlGaAsSb/AlGaInAs type-II quantum wells

Gerhard Roesel; Markus Grau; Ralf Meyer; Markus-Christian Amann

doi:10.1117/12.528839

14 June 2004 Tunable filters using AlGaAsSb/AlGaInAs type-II quantum wells

Gerhard Roesel, Markus Grau, Ralf Meyer, Markus-Christian Amann

Proceedings Volume 5350, Optical Components and Materials; (2004) https://doi.org/10.1117/12.528839
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

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.

Citation Download Citation

Gerhard Roesel, Markus Grau, Ralf Meyer, and Markus-Christian Amann "Tunable filters using AlGaAsSb/AlGaInAs type-II quantum wells", Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); https://doi.org/10.1117/12.528839

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