GLOBAL INVESTIGATION OF THE INFLUENCE OF THE PHASE OF SUBHARMONIC EXCITATION OF A DRIVEN SYSTEM

Adding a small subharmonic perturbation to the driving signal of a mod ulated laser allows one to control its dynamics. The influence of the phase of such a perturbation has been investigated both experimentally and by numerical simulations on a model of a fiber laser subjected to pump modulation. Depending on thr operating conditional the laser des tabilizes through a period-doubling cascade or via quasiperiodicity. S uitably phased subharmonic perturbations can stabilize periodic orbits . shift the whole bifurcation diagram, and induce new arises. Experime ntal observations are in excellent agreement with the predictions from a simple modal or the fiber laser.