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150-nm tuning range in a grating-coupled external cavity quantum-dot laser

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8 Author(s)
Li, H. ; Center for High Technol. Mater., New Mexico Univ., Albuquerque, NM, USA ; Liu, G.T. ; Varangis, P.M. ; Newell, T.C.
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An antireflection (AR) coated single-stack quantum-dot (QD) laser in a grating-coupled external cavity is shown to operate across a tuning range from 1.095 μm to 1.245 μm. This 150-nm range extends from the energy levels of the ground state to excited states. At any wavelength, the threshold current density is no greater than 1.1 kA/cm2. This large tunable range is the product of the rapid carrier filling of the higher energy states under a low pumping current and homogeneous broadening in the QD ensemble. The possibility of a larger tuning range is discussed with the further improvement of the AR-coating.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 7 )