Crenelated fast oscillatory outputs of a two-delay electro-optic oscillator

Weicker, Lionel; Erneux, Thomas; Jacquot, Maxime; Chembo, Yanne K.; Larger, Laurent

doi:10.1103/physreve.85.026206

Cited by 27 publications

(6 citation statements)

References 27 publications

(29 reference statements)

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“…To support this asumption, one might notice that such numerically obtained waveforms were found to exhibit very good qualitative agreement with the one observed in the experiment [33]. The proposed model has been also successfully used to derive analytically [34] most of the bifurcation features indeed observed in the experiment, thus indicating that the large amplitude solutions can be confidently calculated numerically from the noise-free model.…”

Section: A Setup Delivering a Broadband Optoelectronic Signalsupporting

confidence: 69%

Noise and Chaos Contributions in Fast Random Bit Sequence Generated From Broadband Optoelectronic Entropy Sources

Fang

Wetzel

Mérolla

et al. 2014

IEEE Trans. Circuits Syst. I

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During the last 4 years, chaotic waveforms for random number generation found a deep interest within the community of analogue broadband chaotic optical systems. Earlier investigations on chaos-based RNG were proposed in the 90s and early 2000, however mainly based on piecewise linear (PL) 1D map, with bit rate determined by analog electronic processing capabilities to provide the PL nonlinear function of concern. Optical chaos came with promises for much higher bit rate, and entropy sources based on high complexity (high dimensional) continuous time (differential) dynamics. More specifically in 2009, Reidler et al. published a paper entitled "An optical ultrafast random bit generator", in which they presented a physical system for a random number generator based on a chaotic semiconductor laser. This generator is claimed to reach potentially the extremely high rate of 300 Gb/s. We report on analysis and experiments of their method, which leads to the discussion about the actual origin of the obtained randomness. Through standard signal theory arguments, we show that the actual binary randomness quality obtained from this method, can be interpreted as a complex mixing operated on the initial analogue entropy source. Our analysis suggests an explaination about the already reported issue that this method does not necessarily require any specific deterministic property (i.e. chaos) from the physical signal used as the physical source of entropy. The bit stream randomness quality is found to result from "aliasing" phenomena performed by the post-processing method, both for the sampling and the quantization operations. As an illustration, such random bit sequences extracted from different entropy sources are investigated. Optoelectronic noise is used as a non deterministic entropy source. Electro-optic phase chaotic signal, as well as simulations of its deterministic model, are used as deterministic entropy sources. In all cases, the extracted bit sequence reveals excellent randomness.

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Section: A Setup Delivering a Broadband Optoelectronic Signalsupporting

confidence: 69%

Noise and Chaos Contributions in Fast Random Bit Sequence Generated From Broadband Optoelectronic Entropy Sources

Fang

Wetzel

Mérolla

et al. 2014

IEEE Trans. Circuits Syst. I

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“…The latest version was especially designed in the framework of 10 Gb=s optical chaos communication, and it succeeded in establishing, through the realistic conditions of a field experiment, the state of the art in speed and transmission quality thanks to highly controllable differential phase shift keying (DPSK) optical communication techniques [18]. Beyond the operational chaos communication demonstration, this so-called "phase chaos setup" is characterized by temporally nonlocal delayed feedback, which provided both additional virtual space-time coupling features and novel bifurcation phenomena [19,20]. The phase chaos setup with its bandwidth capability and high controllability thus appeared to be of great potential interest in the framework of RC photonic processing as well.…”

Section: Methodsmentioning

confidence: 99%

High-Speed Photonic Reservoir Computing Using a Time-Delay-Based Architecture: Million Words per Second Classification

et al. 2017

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Reservoir computing, originally referred to as an echo state network or a liquid state machine, is a braininspired paradigm for processing temporal information. It involves learning a "read-out" interpretation for nonlinear transients developed by high-dimensional dynamics when the latter is excited by the information signal to be processed. This novel computational paradigm is derived from recurrent neural network and machine learning techniques. It has recently been implemented in photonic hardware for a dynamical system, which opens the path to ultrafast brain-inspired computing. We report on a novel implementation involving an electro-optic phase-delay dynamics designed with off-the-shelf optoelectronic telecom devices, thus providing the targeted wide bandwidth. Computational efficiency is demonstrated experimentally with speech-recognition tasks. State-of-the-art speed performances reach one million words per second, with very low word error rate. Additionally, to record speed processing, our investigations have revealed computing-efficiency improvements through yet-unexplored temporalinformation-processing techniques, such as simultaneous multisample injection and pitched sampling at the read-out compared to information "write-in".

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“…According to Refs. 30 and 31, the delay time of the feedback loop must satisfy the following conditions: (1) θ≃103Ti≃106τ. The oscillator loop is characterized by a high frequency cutoff with a response time τ∼10 ps and by a low frequency cutoff with a response time θ∼1 μs.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Electro-optical chaotic communication system based on additional chaotic phase-shift with time-delay signature concealment

Zhu,

Wang,

Zhang

2023

Opt. Eng.

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We propose and demonstrate an electro-optical chaotic communication system with additional chaotic phase-shift based on the mutual coupling structure. Under the condition of complete concealment of time-delayed signatures (TDSs), the key space of the system is greatly enhanced and highly reliable chaotic communication is finally realized. The additional-phase introduced by the new branch is nonlinearly superimposed on the phase generated by the chaotic signal of the original branch, which improves the complexity and aperiodicity of chaos. For security performance, the system only needs a very small feedback gain (i.e., β i ¼ 2.5) to conceal TDSs. Moreover, since the system has only one chaotic signal transmitted in the transmission link, it overcomes the exposure of TDSs caused by the cross-correlation characteristics between different links. At the same time, the system has strong synchronization robustness and can achieve high-quality communication when the parameters are well-matched. To sum up, the proposed system can effectively resist eavesdropping, which provides security for the physical layer of optical networks.

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Crenelated fast oscillatory outputs of a two-delay electro-optic oscillator

Cited by 27 publications

References 27 publications

Noise and Chaos Contributions in Fast Random Bit Sequence Generated From Broadband Optoelectronic Entropy Sources

Noise and Chaos Contributions in Fast Random Bit Sequence Generated From Broadband Optoelectronic Entropy Sources

High-Speed Photonic Reservoir Computing Using a Time-Delay-Based Architecture: Million Words per Second Classification

Electro-optical chaotic communication system based on additional chaotic phase-shift with time-delay signature concealment

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