Ultrafast and real-time physical random bit extraction with all-optical quantization

Optical chaos generated by perturbing semiconductor lasers has been viewed, over recent decades, as an excellent entropy source for fast physical random bit generation (RBG) owing to its high bandwidth and large fluctuations. However, most optical-chaos-based generators perform their quantization process in the electrical domain using analog-to-digital converters, so real-time rates a single channel are severely limited at level of Gb/s due electronic bottleneck. Here, we propose experimentally demonstrate all-optical method RBG where chaotic pulses quantized into stream means length highly nonlinear fiber. In our proof-of-concept experiment, 10-Gb/s is successfully on-line method. Note that single-channel rate only bandwidth. Considering Kerr nonlinearity silica fiber with ultrafast response few femtoseconds exploited composing key part quantizing laser chaos, this scheme thus may operate potentially much higher than 100 provided sufficient available.