A new publication from Opto-Electronic Advances; DOI 10.29026/oea.2022.200026 overviews parallel generation of wideband complex chaotic signals with low correlation.
Optical chaos has been widely applied in many fields such as secure optical communication, high-speed random number generator, radar and photonic neural network, because of its features of noise-like waveform, unpredictability, wideband spectrum, and etc. In these applications, the bandwidth and complexity of optical chaotic signal are the key indicators determining the application performance. For example, in secure optical communication systems, the bandwidth and complexity of chaotic carriers determine the transmission capacity and the system security, while in the application of random number generations where optical chaotic signals are used as the physical entropy source, the bit rate and the randomness of the generated bit sequences are determined by the bandwidth and complexity of the chaotic signal. Therefore, improving the bandwidth and complexity is crucial for improving the practical application performance of optical chaos. Up to present, plenty of efforts have been made to achieve bandwidth and complexity enhancement. However, these schemes mainly focus on single-channel optical chaos generation, while parallel generation of multiple chaotic signals with low correlations is lack of research, which has great potential for further improving the applications of optical chaos.
Recently, the authors of this paper proposed a novel scheme for generating parallel wideband complex chaotic signals with low correlation, in virtue of continuous-wave laser and constant-amplitude self-phase-modulation injection. In this scheme, two independent lasers were used as the optical sources for chaos generation. By introducing a phase modulator and a dispersive component into the chaotic system and in virtue of the spectrum-broaden effect of the phase modulation and the phase-to-intensity conversion of dispersion, simultaneous generation of two wideband chaotic signals with bandwidths (80% power bandwidth) larger than 24 GHz and a cross-correlation coefficient lower than 0.1 were experimentally demonstrated. The influence of feedback strength on the bandwidth, the complexity and the cross-correlation of the simultaneously generated two chaotic signals were investigated thoroughly, and the results indicated that their scheme can easily obtain two wideband complex chaotic signals with low correlation. In comparison with the conventional external-cavity semiconductor laser-based optical chaos generation schemes, the bandwidths of the two simultaneously generated chaotic signals in their scheme were enhanced by more than twice, and the characteristic of optical feedback delay was completely suppressed, as such the complexity was significantly improved. In addition, the number of outputted chaotic signals with this scheme can be further increased by adding more lasers.
The proposed scheme provides an attractive solution for parallel multiple chaos generation and shows great potential for multi-channel chaos communications and multiple random bit generations.
Article reference: Zhao AK, Jiang N, Peng JF, Liu SQ, Zhang YQ et al. Parallel generation of low-correlation wideband complex chaotic signals using CW laser and external-cavity laser with self-phase-modulated injection. Opto-Electron Adv 5, 200026 (2022). doi: 10.29026/oea.2022.200026
Keywords: optical chaos / optical feedback / semiconductor laser / electro-optic phase modulation
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The research group of Prof. Kun Qiu and Prof. Ning Jiang from the University of Electronic Science and Technology of China concentrates on the fields including optical chaos technology, secure optical communications, all-optical switching, high-speed optical transmissions, optical access networks, as well as advanced optical devices, etc. Their group has received the Class-2 Prize of National Technical Invention as well as 9 provincial or ministerial awards for their contributions to development of science and technology. Regarding the research of optical chaos technology and its applications, their group has established experimental platforms for wideband optical chaos generation and high-speed secure optical transmission, published more than 100 research papers and finished over 10 important relevant projects.
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