Abstract
We report on a study of polarization properties of asymmetric, multimode vertical-cavity surface-emitting lasers (VCSEL) subjected to electrical RF modulation. When subjected to RF modulation, complex frequency-dependent polarization properties, especially near the polarization switching point are revealed. We propose a scheme of rapidly switching the two RF frequencies modulating the VCSEL, in order to achieve fast polarization modulation in these VCSEL. Polarization modulation up to 300 MHz by modulating the RF frequency and up to 1.5 GHz with RF power modulation has been demonstrated; the fastest reported electrically controlled polarization modulation for multimode VCSELs.
Highlights
Polarization properties of vertical-cavity surface-emitting lasers (VCSEL) are extremely interesting and yet, poorly understood
In this paper we report on experimental observations of extremely rich polarization resolved frequency response of current modulated asymmetric multimode VCSELs, showing that, even though at low frequencies VCSEL exhibits only one type of polarization, it still exhibits polarization mode competition at higher frequencies
We report on the observations of rich and complex frequency response of a VCSEL subjected to RF current modulation
Summary
Polarization properties of VCSELs are extremely interesting and yet, poorly understood. It is well known [1] that VCSELs generally exhibit abrupt polarization switching as a function of bias current, from higher to lower frequency mode (type-I switching) or vice-versa (type-II switching), depending on the detuning between the polarization modes and their relative position with respect to the gain spectrum [2]. In this paper we report on experimental observations of extremely rich polarization resolved frequency response of current modulated asymmetric multimode VCSELs, showing that, even though at low frequencies VCSEL exhibits only one type of polarization, it still exhibits polarization mode competition at higher frequencies. High resolution optical spectral measurements reveal the details on the polarization mode-competition for multi-transverse mode, asymmetric VCSEL
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