期刊
OPTICS EXPRESS
卷 29, 期 5, 页码 7904-7915出版社
Optica Publishing Group
DOI: 10.1364/OE.419654
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资金
- Open Research Project of The Hubei Key Laboratory of Intelligent Geo-Information Processing [KLIGIP2019B11]
- National Key Research and Development Program of China [2018YFB1801304]
A model-free time delay signature (TDS) extraction method for optical chaos systems has been proposed. The blind identification method based on long short-term memory neural network (LSTM-NN) model shows effectiveness in extracting TDS in chaos systems with high tolerance to additive noise.
We propose a model-free time delay signature (TDS) extraction method for optical chaos systems. The TDS can be identified from time series without prior knowledge of the actual physical processes. In optical chaos secure communication systems, the chaos carrier is usually generated by a laser diode subject to opto-electronic/all-optical time delayed feedback. One of the most important factors to security considerations is the concealment of the TDS. So far, statistical analysis methods such as autocorrelation function (ACF) and delayed mutual information (DMI) are usually used to unveil the TDS. However, the effectiveness of these methods will be reduced when increasing the nonlinearity of chaos systems. Meanwhile, certain TDS concealment strategies have been designed against statistical analysis. In our previous work, convolutional neural network shows its effectiveness on TDS extraction of chaos systems with high loop nonlinearity. However, this method relies on the knowledge of detailed structure of the chaos systems. In this work, we formulate a blind identification method based on long short-term memory neural network (LSTM-NN) model. The method is validated against the two major types of optical chaos systems, i.e. opto-electronic oscillator (OEO) chaos system and laser chaos system based on internal nonlinearity. Moreover, some security enhanced chaotic systems are also studied. The results show that the proposed method has high tolerance to additive noise. Meanwhile, the data amount needed is less than existing methods. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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