Experiments have yielded polarization self-modulation in vertical-cavity surface-emitting lasers (VCSELs) subject to a π/2 polarization-rotating optical feedback. The phenomenon has been simulated numerically, but its bifurcation has never been explained. We show that polarization self-modulation results from a Hopf bifurcation mechanism that can be analyzed in terms of the laser feedback parameters. Our analysis predicts other bifurcations for low values of the feedback rate, which explain why more-complex time-dependent outputs have been observed as alternatives to polarization self-modulation.
© 2002 Optical Society of America
M. Sciamanna, F. Rogister, O. Deparis, P. Mégret, M. Blondel, and T. Erneux, "Bifurcation to polarization self-modulation in vertical-cavity surface-emitting lasers," Opt. Lett. 27, 261-263 (2002)