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Frequency response of current-driven polarization modulation in vertical-cavity surface-emitting lasers

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7 Author(s)
Verschaffelt, G. ; Department of Applied Physics and Photonics (TW–TONA), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium ; Albert, J. ; Veretennicoff, I. ; Danckaert, J.
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We present an experimental study of the current-driven polarization modulation properties of vertical-cavity surface-emitting Lasers (VCSELs). Some VCSELs exhibit a high-contrast polarization flip for a particular value of pump current. By modulating the current around this value we measure the critical modulation amplitude necessary to force current-driven polarization switching as a function of the modulation frequency. We thus obtain the polarization modulation frequency response, which shows the same cut-off frequency as the thermal frequency response. This indicates the necessity to incorporate a temperature-dependent variable in realistic models that describe the polarization behavior of these VCSELs. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:80 ,  Issue: 13 )