An external-cavity semiconductor laser (ECSL) outputs high-dimensional chaos, which has potential for various applications, but the unwanted time-delay signature (TDS) might compromise the performance. In this work, a highly integrated and extensible framework of phased-array semiconductor lasers, operating in a steady state when isolated, is employed to postprocess the original chaos generated by an ECSL. Our results demonstrate that such a compact active device enables TDS suppression over wide parameter space. Better performance can be achieved in the proposed scheme compared with the conventional, discrete semiconductor laser subjected to optical chaotic injection. The influence of the injection parameters and the laser separation is studied, which further confirms the feasibility of the proposed scheme for TDS suppression. The phased array can be readily extended to include a large number of elements, and thus the current scheme allows for the generation of multiple independent chaotic signals with no discernible TDS in parallel. This means that the current study may pave the way for parallel random number generation based on optical chaos.

中文翻译：

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外腔半导体激光器产生的光混沌中的相控阵辅助时延签名抑制

外腔半导体激光器（ECSL）输出高维混沌，这可能会在各种应用中发挥作用，但是不需要的时间延迟签名（TDS）可能会影响性能。在这项工作中，采用高集成度和可扩展性的相控阵半导体激光器框架（在隔离时处于稳定状态）对ECSL产生的原始混沌进行后处理。我们的结果表明，这种紧凑的有源器件能够在较宽的参数空间内抑制TDS。与经受光混沌注入的传统分立半导体激光器相比，在提出的方案中可以实现更好的性能。研究了注入参数和激光分离的影响，进一步证实了所提出的TDS抑制方案的可行性。相控阵可以很容易地扩展为包括大量元素，因此当前方案允许生成多个独立的混沌信号，而并行的TDS却不明显。这意味着当前的研究可能为基于光学混沌的并行随机数生成铺平道路。