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Authors: S. Kumari, J. S. Gustavsson, E. P. Haglund, J. Bengtsson, A. Larsson, G. Roelkens, R. Baets
Title: Design of an 845 nm GaAs vertical-cavity silicon integrated laser with an intra-cavity grating for coupling to a SiN waveguide circuit
Format: International Journal
Publication date: Accepted for publication. Not yet published
Journal/Conference/Book: IEEE Photonics Journal


A short-wavelength hybrid GaAs vertical-cavity silicon integrated laser (VCSIL)
with in-plane waveguide coupling has been designed and optimized using numerical
simulations. A shallow etched silicon nitride (SiN) grating is placed inside the cavity of the
hybrid vertical-cavity silicon integrated laser to both set the polarization state of the resonant
optical field and to enable output coupling to a SiN waveguide with high efficiency. The
numerical simulations predict that for apertures of 4 and 6 microns oxide-confined VCSILs
operating at 845 nm wavelength, a slope efficiency for the light coupled to the waveguide of
0.18 and 0.22 mW/mA is achievable respectively while maintaining a low threshold gain of
583 and 589 cm-1 respectively for the lasing.

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