2010, Vol.13, No.1, pp.32-37
We study the role of the bias current in the polarization dynamics
in regions of polarization bistability of a single-transverse-mode
vertical-cavity surface-emitting laser diode which exhibits elliptical
polarization before switching.
We find that the bias current affects
the mean intensity of one polarization mode
in the polarization switching domain,
while it does not affect the other mode.
The time series of the polarized intensity
fluctuations for different values of the bias current are analyzed in terms
of a stochastic Langevin equation. We show how to extract the drift
function and the resulting potential of the Langevin equation from the
We find that
the potentials obtained from Langevin drift functions are in excellent
agreement with the Boltzmann probability distribution of the
experimental data. We
find that intensity fluctuations are
determined by both monostable and bistable potentials.
In particular, we observed double-well (bistable) potentials
at the low bias current region of the polarization switching domain.
Key words: polarization switching, bistability, data analysis, vertical-cavity surface-emitting lasers (VCSELs)
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