Experimental demonstration of a broadband optoelectronic chaos system based on highly nonlinear configuration of IQ modulator

Luo, Hanwen; Cheng, Mengfan; Huang, Chuanming; Ye, Bolin; Shao, Weidong; Deng, Lei; Yang, Qi; Zhang, Minming; Liu, Deming

doi:10.1364/ol.435476

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…A roll-off factor of 0.1 was used. The parameters of DSM are generated by the Delta Sigma Toolbox 22 and scrambled by the chaotic random number sequence, which is generated by our previous work 26 . This chaos source consists of an optoelectronic oscillator based on commercial devices, which can achieve a bandwidth of 29.1 GHz (10 dB bandwidth).…”

Section: Methodsmentioning

confidence: 99%

Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

Luo,

Zhang,

Dai

et al. 2024

Commun Eng

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Data security is a key feature of future communications networks. Physical layer introduces rich physical mechanisms to increase the complexity of deciphering and provides extensive protection, but faces challenges in compatibility with commercial systems. Quantum noise stream cipher (QNSC) has been proposed as a promising solution to overcome this problem by fusing the stream cryptography regime with the quantum noise masking physical mechanism. However, it has limitations in terms of digital to analog conversion and clock data synchronization of ultra-high-order ciphertext as well as flexible control of masking noise. Here we report a 147.9-Gbps device-compatible quadrature amplitude modulation (QAM) QNSC secure scheme over 75-km fiber. Thanks to delta-sigma modulator, the transmission of 220 × 220-order QAM-QNSC signal are established through the low-order digital signal. We develop a theoretical model for flexibly regulating the transmission rate and security performance. Broadband optical chaos introduces true randomness and acts on the masking noise.

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Section: Methodsmentioning

confidence: 99%

Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

Luo,

Zhang,

Dai

et al. 2024

Commun Eng

Self Cite

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A time-delay signature elimination and broadband electro-optic chaotic system with enhanced nonlinearity by deep learning

wang

2022

Opt. Express

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In this paper, a novel electro-optic chaotic system with enhanced nonlinearity by deep learning (ENDL) is proposed to achieve time-delay signature (TDS) elimination. A long-short term memory network (LSTM) is trained by a specially designed loss function to enhance the nonlinear effect that can hide the TDS of the system. For the first time, the trained deep learning module is put into a single feedback loop to participate in chaos generation. Simulation results show that the ENDL system can eliminate TDS and increase the bandwidth to more than 31GHz when the feedback intensity is very low (α = 4V). Moreover, the complexity of the chaotic output can be improved with permutation entropy (PE) reaching 0.9941. The synchronization result shows that the ENDL system has high sensitivity to TDS but has low sensitivity to the feedback intensity, thus the system has both high security and high robustness. This system has an uncomplicated synchronization structure and high flexibility, and it opens up a new direction for high-quality chaos generation.

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Wideband and high-dimensional chaos generation using optically pumped spin-VCSELs

Zeng¹,

Zhou²,

Huang³

et al. 2023

Opt. Express

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We propose and numerically demonstrate wideband and high-dimensional chaos signal generation based on optically pumped spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs). Here, we focus on the chaotic characteristics of spin-VCSELs under two scenarios: one is a spin-VCSEL with optical feedback and the other is optical heterodyning the outputs of two free-running spin-VCSELs. Specifically, we systematically investigate the influence of some key parameters on the chaotic properties, i.e., bandwidth, spectral flatness (SF), time delay signature (TDS), correlation dimension (CD), and permutation entropy (PE), and reveal the route to enhance these properties simultaneously. Our simulation results demonstrate for the first time that spin-VCSELs with simple auxiliary configurations allow for chaos generation with desired properties, including effective bandwidth up to 30 GHz and above, no TDS of greater than 0.2, the flatness of 0.75 and above, and the high complexity/dimensionality over a wide range of parameters under both schemes. Therefore, our study may pave the way for potential applications requiring wideband and high-dimensional chaos.

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Experimental demonstration of a broadband optoelectronic chaos system based on highly nonlinear configuration of IQ modulator

Cited by 6 publications

References 20 publications

Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

A time-delay signature elimination and broadband electro-optic chaotic system with enhanced nonlinearity by deep learning

Wideband and high-dimensional chaos generation using optically pumped spin-VCSELs

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