Massive Bandwidth-Enhanced Chaotic Generation Based on Microresonator Cascaded by Phase Modulator and Dispersive Component

Chaotic microcombs have attracted increasing attention for generating massive optical chaos, which has important potential applications in parallel and massive chaotic radar, random bit generation (RBG) and reinforcement learning. In this work, we propose a novel scheme that affords simultaneous generation of massive wideband chaos, by a microresonator (MR) cascaded with a chaotic phase modulator (PM) and dispersive component. Numerical simulations illustrate the generation of over 150 wideband comb teeth spanning the 1400-1700 nm wavelength range. Additionally, the bandwidth of each chaotic comb tooth within this range is increased to tens of GHz. Experimental results demonstrate the bandwidth of a single comb chaotic signal within the operational band of the PM is increased by more than tenfold. Moreover, the feasibility of further enhancing the effective bandwidth by adjusting modulating signal voltage, pump power, and frequency detuning within reasonable parameter ranges is confirmed. This research introduces new possibilities for multi-channel high-speed signal processing and precise signal analysis based on chaos.