Chaotic controlling via phase periodicity in optical injection semiconductor lasers

In this paper, a method of chaotic controlling is presented via controlling the phase in semiconductor lasers under to external optical injection. Chaos can be controlled to a periodic state or multi-periodic states by periodically modulating a phase-controller to control the injection light phase. Under the conditions of different intensities of injection light, numerical results shou thet: (1) Chaos is controlled into periodic state, dual-periodic state, triple-periodic state, four fold-periodic state and multi-periodic state respectively by a method of half-wavelength periodic modulation; (2) Chaos can be controlled into periodic state or multi-periodic state by the method of quarter-wavelength periodic modulation. Injection-locking phenomena in laser is produced under the conditions of high frequency modulation, where the frequency_locking domain is from 19GHz to 21GHz; (3) Chaos is also controlled into periodic state and multi-periodic state by a method of a wavelength periodic modulation.