@InProceedings{Supelec396,
author = {Krassimir Panajotov and Ignace Gatare and Jordi Buesa and Hugo Thienpont and Marc Sciamanna},
title = {{Polarization dynamics in VCSELs induced by optical injection}},
year = {2006},
booktitle = {{Proceedings of 2006 8th International Conference on Transparent Optical Networks}},
publisher = {IEEE},
pages = {176},
month = {jun},
abstract = {We will present a survey on our experimental and theoretical
studies of polarization dynamics in vertical-cavity
surface-emitting lasers (VCSELs) when subject to orthogonal
optical injection, i.e. the injected field has a linear
polarization (LP) orthogonal to that of the free-running VCSEL.
The output characteristics of an oxide-confined AlGaAs-GaAs
quantum well VCSEL are experimentally mapped as a function of the
strength of the optical injection and the detuning between the
injection frequency and the free-running frequency of the
solitary laser. Experimentally, we achieve a very large range of
frequency detunings: from -82 to 89 GHz. Two border lines at
negative and positive detunings form "a tongue" of polarization
switch (PS) region; its area expanding to both positive and
negative detunings with increasing the injection strength. The
two border lines are with a well pronounced region of
bistability, the hysteresis width is almost constant for positive
detuning and increasing for negative ones. Only in the later case
the route to PS occurs through injection locking (both the
polarization and the frequency of the VCSEL locks to the ones of
the master laser). The route to injection locking can be
accompanied by a rich nonlinear dynamics, including limit cycle,
wave mixing, subharmonic resonance and possibly period doubling
route to chaos. The PS "tongue" is further strongly influenced at
large positive detuning, which we identify as being due to an
injection locking of the first-order transverse mode of the
VCSEL. We carry out theoretical studies of the case of orthogonal
injection in VCSELs, which qualitatively match the experimental
findings. Furthermore, we predict the existence of new injection
locked solution for which the two LP modes both lock to the
master laser frequency resulting in an elliptically polarized
injection locked (EPIL) steady-state. Modern continuation
techniques allow us to unveil an unfolding mechanism of the EPIL
solution as the detuning varies and also to link the existence of
the EPIL solution to a resonance condition between the master
laser frequency and the frequency of the suppressed VCSEL LP
mode. This EPIL solution may coexist with the LP injection locked
solution, resulting in a new type of bistability in VCSELs},
hal = {hal-00212867}
}