Experimental Investigations of Time-Delay Signature Concealment in Chaotic External Cavity VCSELs Subject to Variable Optical Polarization Angle of Feedback
Experimental Investigations of Time-Delay Signature Concealment in Chaotic External Cavity VCSELs Subject to Variable Optical Polarization Angle of Feedback
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DOI：
10.1109/jstqe.2013.2244567
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发表时间：
2013-02
影响因子：
4.9
通讯作者：
S. Priyadarshi;Yanhua Hong;I. Pierce;K. Shore
中科院分区：
文献类型：
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作者：
S. Priyadarshi;Yanhua Hong;I. Pierce;K. Shore
对混沌垂直腔面发射激光器(VCSEL)的时延(TD)信号隐藏进行了实验研究。VCSEL具有可变的反馈光偏振角以及可变的光反馈强度和偏置电流。利用自相关和基于信息论的置换熵函数来确定TD签名的隐蔽性。结果表明，在-18分贝的低强度反馈下，TD签名是隐藏的。在中等反馈强度下，TD特征对反馈光偏振角的旋转非常敏感，在45°~90°的偏振角范围内观察到TD隐蔽性。
Time-delay (TD) signature concealment in a chaotic vertical-cavity surface-emitting laser (VCSEL) is studied experimentally. The VCSEL is subject to variable optical polarization angle of feedback along with variable optical feedback strength and bias current. The TD signature concealment is determined through the use of autocorrelation and information theory-based permutation entropy functions. It is found that the TD signature is concealed at low feedback of strength of order -18 dB. At moderate feedback strength, the TD signature is sensitive to the rotation of optical polarization angle of feedback with TD concealment being observed for polarization angles in the range from 45° to 90°.