Generation of wideband chaos with time-delay signature suppression by asymmetric dual-path optical injection

Chaotic lasers exhibit wideband spectrum and noise-like time series properties, which is widely used in the fields of secure communication, chaotic lidar, optical sensing and so on. We propose and demonstrate a method for generating wideband low time-delay chaotic laser based on asymmetric dual-path optical injection and filter feedback experimentally. A chaotic signal with a standard bandwidth of 36.1 GHz and the time delay signature value of 0.031 is obtained. In addition, we investigate the effects of filter feedback strength, frequency detuning and injection intensity on the chaotic laser characteristics. The experimental results show that chaotic laser bandwidth enhancement and time delay signature suppression can be obtained simultaneously over a wide range of operating parameters. The proposed chaotic laser generation method has a promising application prospect in areas such as optical sensing, secure communication, high-speed random number generation and LiDAR.