Wideband chaos generation using a VCSEL with intensity modulation optical injection for random number generation

Conclusion In conclusion, a scheme for broadband chaos generation is proposed and demonstrated based on a VCSEL with subharmonic modulation optical injection. A 1/2 sub-harmonic modulation signal is injected into the VCSEL to destabilize the P1 state and generate a complex chaos signal with a bandwidth above 20 GHz. Moreover, such a chaos signal has been used as a physical entropy source to produce the physical number. By adopting a 4-LSBs extraction method, we can realize a 320 Gb/s physical number stream with verified randomness. Our scheme may offer a new alternative solution for ultrafast physical number generation using a single VCSEL.