9 May 2018 Thermally-induced birefringence in VCSELs: approaching the limits
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Abstract
Polarization dynamics in vertical-cavity surface-emitting lasers (VCSELs) are much faster than their intensity-driven counterparts and can be a potential approach to overcome the bandwidth limitation in short-distance data transmission. The birefringence splitting B as the frequency difference between the two fundamental polarization modes is an important factor determining the polarization dynamics in spin-VCSELs. Although B can be strongly influenced by mechanical bending, for later applications an on-chip solution for birefringence tuning is favored. With an electrically driven asymmetric heating device we have demonstrated a thermally induced tuning range of ΔB = 45GHz. The maximum achievable birefringence tuning was not limited by the laser but by material parameters and the fabrication process. In this paper we present an optimized design for thermally induced birefringence tuning and additional possibilities to increase the efficiency of the mechanism.
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Tobias Pusch, Sebastian Scherübl, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann, Rainer Michalzik, "Thermally-induced birefringence in VCSELs: approaching the limits", Proc. SPIE 10682, Semiconductor Lasers and Laser Dynamics VIII, 1068219 (9 May 2018); doi: 10.1117/12.2306215; https://doi.org/10.1117/12.2306215
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