Control of chaos in a semiconductor laser using photoelectric nonlinear feedback

A novel nonlinear chaos-control method of a semiconductor laser is presented by adding a control path of photoelectric delayed nonlinear feedback. Chaos-control physical models of an injected semiconductor laser are studied by using photoelectric nonlinear and linear delayed controllers. And chaos-control equations are analyzed. A route to a periodic state or a cycle-one from chaos is found. Chaos-control can be realized. When we adjust the delayed time of the nonlinear and linear photocurrents, the chaotic laser can be conducted to show a single-cycle, a dual-cycle, a cycle-3, a cycle-4 or other multicycles. When we modulate the photocurrent nonlinear controller, the chaotic laser can be brought into a single-period, a dual-period, a period-3, a period-4 or other multi-periodic states.