LIPPI , Gian-Luca

The application of appropriately shaped injection current fronts to the transition between two logical levels in data transmission allows for the removal of all relaxation oscillations, as calculated from a standard model for single-mode semiconductor lasers. High-quality signals at speeds up to 10 Gbit/s for above-threshold biasing are...

We identify the origin of some numerical difficulties related to causality which appear in the simulation of transport equations. Two numerical techniques are presented for the integration of models describing counter-propagating laser beams in interaction with a nonlinear medium. One, based on the characteristic method, rests on the transport...

Semiconductor lasers are tiny optoelectronic devices that are routinely used in countless applications ranging from computer pointing devices to optical data transmission. In addition to this, they can also serve as a versatile experimental platform for the exploration of dynamical systems and complex phenomena. In the following we discuss two...

We show that a model for the collective atomic recoil laser, previously introduced to include collisions with an external buffer gas, can be reduced to a single dynamical equation for the probe amplitude. This is the result of a clever adiabatic elimination of the atomic variables and of the assumption of a negligible effect of the probe field...

The introduction of patterned current fronts that steer the transition between directly modulated optical bits allows for a strong modification in the shape of the trajectory evolving from the initial to the final state in semiconductor lasers. The problem of minimal transition time between two stationary points of the system will be formulated...

The interaction of an atomic gas confined inside a cavity containing a strong electromagnetic field is numerically and theoretically investigated in a regime where recoil effects are not negligible. The spontaneous appearance of a density grating (atomic bunching) accompanied by the onset of a coherent, back-propagating electromagnetic wave is...

The response of a Class B laser to a rapid change in one of its parameters is known to be accompanied by delay and ringing. It has been theoretically and numerically shown that the transition can be modified by using adequate functional shapes for the control parameter (e.g., the laser pump) in order to steer the laser from one point of...

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