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We show that a topological investigation of the phase space of aSemiconductor Ring Laser can be used to devise switching schemes which arealternative to optical pulse injection of counter-propagating light. To providephysical insight in these switching mechanisms, a full bifurcation analysis andan investigation of the topology is performed on a two-dimensional asymptoticmodel. Numerical simulations confirm the topological predictions.

A phase-space approach to directional switching in semiconductor ring lasers