Wideband physical random optical chaos generation using semiconductor lasers

In recent years, the generation of wideband l random optical chaos has attracted extensive interest for its extensive applications in the fields of secure communications, radar, and random number generations. In this talk, the presenter demonstrate a novel method for the semiconductor laser-based wideband optical chaos generation with excellent randomness, in virtue of the optical spectrum expansion of self-chaotic-phase-modulation-modulated optical feedback and the phase-to-intensity conversion of nonlinear filtering. It is experimentally demonstrated that, with the proposed method, wideband chaos with flat spectrum can be easily obtained, and simultaneously, the time-delay signature that directly indicates the privacy of chaos source can also be totally suppressed, which means that the physical randomness of chaos is also significantly improved. This paper presents a novel way to generate wideband physical random chaos for the implement of high-speed secure chaotic communication, high-resolution and high-precision radar, and high-rate random bit generation.