Energy redistribution of a chaotic injected laser for pulsed random bit generation.

Over the past few years, detection and sampling of the continuous emission waveforms have been widely investigated for random bit generations (RBGs). Here, we demonstrate pulsed RBG by manipulating the output emission waveform of a chaotic semiconductor laser. The chaotic emission waveform is first generated using an optically injected laser. It is then sent to a temporal phase modulation followed by a dispersive propagation. This enables a temporal energy redistribution of the chaotic emission waveform for the generation of equally-spaced and amplified optical pulses, where the consecutive pulse peak intensities are digitized for RBG. Simulations and experiments are conducted to demonstrate the effectiveness of the proposed method for pulsed RBGs. This work provides a perspective on generation and processing of chaotic emission waveforms for semiconductor laser-based RBGs.