Open-Versus Closed-Loop Performance of Semiconductor Laser Chaos Synchronization Induced by Digital Signal

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Abstract
Digital signal induced chaos synchronization of semiconductor lasers has attracted significant attention due to its potential for secure long-distance communication. Here, we propose and implement a closed-loop chaos synchronization scheme with distributed feedback lasers driven by random digital signals. The comparison of the chaos synchronization performance in both open-loop and closed-loop configuration is presented. Numerical results indicate that the closed-loop synchronization mechanism is consistent with the open-loop configuration, which is attributed to the consistent nonlinear response of the lasers to digital drive signal under the condition of center frequency locking. Furthermore, the closed-loop configuration reduces correlation between the digital signal and response signals while increasing sensitivity to parameter mismatch, thereby improving system security. Nevertheless, the closed-loop synchronization requires stricter operational conditions, including lower bit error rate, narrower laser linewidth, and larger injection and modulation parameters compared to open-loop systems. These findings provide the guidelines for the optimization of chaos synchronization, particularly for the long-distance key distribution applications.
Funding Information
  • National Natural Science Foundation of China (62035009, U22A2087, 61822509)
  • Guangdong Introducing Innovative and Entrepreneurial Teams (2019ZT08X340)

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