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Shallow surface gratings for high-power VCSELs with one preferred polarization for all modes

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4 Author(s)
Ostermann, J.M. ; Optoelectronics Dept., Univ. of Ulm, Germany ; Debernardi, P. ; Jalics, C. ; Michalzik, R.

Monolithically integrated full-aperture surface gratings are shown to control the polarization of all modes of even highly multimode 850-nm oxide-confined standard industrial vertical-cavity surface-emitting lasers (VCSELs). An orthogonal polarization suppression ratio (OPSR) of more than 11 dB up to thermal rollover is achieved for an output power of 23 mW. For devices with 8-mW output power, an OPSR of more than 20 dB at thermal rollover is observed, without major drawbacks to the overall laser performance.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 8 )