Monolithically integrated dual distributed Bragg grating laser with a large hardware key space

Synchronization of chaos in laser diodes has inspired advancements in physical-layer encryption communication, offering benefits such as high speed, extended range, and favorable compatibility. Nonetheless, a significant challenge persists in developing a synchronous chaotic transceiver with an extensive hardware key space without increasing system complexity. In this study, we propose the utilization of monolithically integrated dual distributed Bragg grating lasers (DDBGLs) to construct a synchronous chaotic transceiver with a large hardware key space. The proposed DDBGL features a multisection structure that permits independent current settings, enabling a large hardware key space. Experimental results demonstrate that a key space of 2 84 can be achieved while maintaining synchronization of the DDBGLs.