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Design and Continuous-Wave Room-Temperature Performance of Ga(AlInAs)Sb DFB Lasers at 2.8 \mu m

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5 Author(s)
Hummer, M. ; Tech. Phys., Univ. Wurzburg, Wurzburg ; Rosner, K. ; Lehnhardt, T. ; Muller, M.
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We have fabricated continuous-wave GaInAsSb-AlGaAsSb distributed-feedback (DFB) lasers in the 2.8- mum range, using a DFB concept requiring no subsequent overgrowth steps, by defining first-order Cr-Bragg gratings laterally to a ridge waveguide. We have simulated the confinement factor GammaCr of the optical mode and the Cr-grating for various ridge widths and investigated the effect on laser properties and single-mode yield in order to optimize DFB lasers in this wavelength region. In terms of low threshold current and high output power, we found an optimum ridge width around 7 mum. These lasers show the smallest average threshold current around 33 mA and a high average output power around 7 mW per facet.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 1 )