In this paper, we present the experimental evidence of chaos generation, modulation by means of opto electronic feedback of semiconductor laser. The output photo current of the pin photo diode is amplified and re-injected as a feedback to the semiconductor laser. The injected feedback photo current produce chaotic laser output, the chaos distribution depends on amplifying strength. In addition to the changing between different chaotic outputs, the jump between chaotic to periodic was observed depending on the amplifying strength of the feedback signal. The synchronization between two oscillators (chaos generators) has been achieved by uni-direction coupling.