Investigations on polarization dynamics of birefringent spin-VCSELs

Natalie Jung; Markus Lindemann; Tobias Pusch; Mohammad Farooq Hashib; Prishila Hoti; Pierluigi Debernardi; Rainer Michalzik; Martin R. Hofmann; Nils C. Gerhardt

doi:10.1117/12.2577488

5 March 2021 Investigations on polarization dynamics of birefringent spin-VCSELs

Natalie Jung, Markus Lindemann, Tobias Pusch, Mohammad Farooq Hashib, Prishila Hoti, Pierluigi Debernardi, Rainer Michalzik, Martin R. Hofmann, Nils C. Gerhardt

Author Affiliations +

Proceedings Volume 11704, Vertical-Cavity Surface-Emitting Lasers XXV; 117040T (2021) https://doi.org/10.1117/12.2577488
Event: SPIE OPTO, 2021, Online Only

Abstract

Vertical-cavity surface-emitting lasers (VCSELs) are widely used in optical data communication mainly in data centers for short-haul transmissions. However, their intensity modulation resonance frequency does not exceed 40 GHz which also limits the achievable modulation bandwidth and data rate. In contrast, spin-VCSELs can overcome these bandwidth limitations by modulating spin and polarization instead of current and intensity. In spin-VCSELs, the birefringence determines the resonance frequency of the polarization dynamics as well as the modulation bandwidth. We control the birefringence and thus the polarization dynamics via the elasto-optic effect by mechanically or thermally induced strain providing polarization oscillation frequencies up to more than 200 GHz. Detailed analysis shows that spin-VCSELs offer polarization dynamics with good signal strength even when operating close to threshold and at high temperatures. Here, we analyze devices with integrated surface gratings. VCSELs with different grating periods as well as mesa diameters and resulting different oxide apertures were investigated.

Conference Presentation

Citation Download Citation

Natalie Jung, Markus Lindemann, Tobias Pusch, Mohammad Farooq Hashib, Prishila Hoti, Pierluigi Debernardi, Rainer Michalzik, Martin R. Hofmann, and Nils C. Gerhardt "Investigations on polarization dynamics of birefringent spin-VCSELs", Proc. SPIE 11704, Vertical-Cavity Surface-Emitting Lasers XXV, 117040T (5 March 2021); https://doi.org/10.1117/12.2577488

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