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提出基于双光反馈下垂直腔面发射激光器(VCSELs)输出的正交偏振分量混沌振荡来同时获取两路物理随机数(PRN)的方案,数值分析了不同反馈强度下所获取的最终比特序列的随机性能。研究结果表明,通过选择合适的反馈参量可使VCSELs中两个偏振分量均呈现混沌振荡;其输出的两路混沌信号作为熵源,经8位模数转换器(ADC)量化、比特序列按位反转、异或(XOR)运算和m bit最低有效位(m-LSBs)截取等后续处理后可得到最终比特序列;采用美国国家标准技术研究所(NIST)提供的NIST special publication 800-22统计测试套件对基于不同反馈强度下所产生的混沌信号熵源所获取的最终比特序列的性能进行测试,初步确定了获取可通过NIST speical publication 800-22统计测试的两路随机数所需的反馈强度的范围。
A scheme of simultaneously obtaining two physical random numbers (PRNs) by chaotic oscillations of orthogonal polarization components output by vertical cavity surface emitting lasers (VCSELs) under dual optical feedback is proposed. The final bit sequences acquired at different feedback intensities are numerically analyzed Random performance. The results show that the two polarization components in VCSELs can be chaotic oscillated by selecting appropriate feedback parameters. The two chaotic signals output by them are used as entropy sources and quantized by 8-bit analog-to-digital converter (ADC) The final bit sequence is obtained after subsequent processing such as inversion, XOR operation and m-LSBs interception; NIST special publication 800-22 provided by the National Institute of Standards and Technology (NIST) The test suite tests the performance of the final bit sequence obtained based on the chaotic signal entropy source generated under different feedback intensities and initially determines the feedback strength required to obtain two random numbers that can pass the NIST speical publication 800-22 statistical test Range.