High-entropy chaos generation using semiconductor lasers subject to intensity-modulated optical injection for certified physical random number generation

Tseng, Chin-Hao; Funabashi, Ryo; Kanno, Kazutaka; Uchida, Atsushi; Wei, Chia-Chien; Hwang, Sheng-Kwang

doi:10.1364/ol.431054

Cited by 22 publications

(12 citation statements)

References 31 publications

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“…By continuing to increase the coupling strength so that (ξ s 12 , f i ) = (0.05, −20 GHz), as Figure 2(a-iv) shows, a broad and continuous spectral distribution appears for either laser, which is a typical signature of chaos. After photodetection, as Figure 2(b-iv) presents, such a spectral feature generates a broadband chaotic microwave with a spectral distribution of more than 40 GHz, which is highly advantageous for chaos-based applications, such as highresolution chaotic radars [39][40][41][42], high-speed chaotic communication [43][44][45][46], and highentropy random number generation [47][48][49][50]. Owing to the round-trip delay coupling, spectral components that are equally separated by 12.45 MHz, as those shown in the inset of Figure 2(b-i) yet with much weaker intensity, also emerge on top of the spectral distribution in Figure 2(b-iv).…”

Section: Dynamics Behaviors Under Symmetric Coupling Strengthmentioning

confidence: 99%

Effects of Asymmetric Coupling Strength on Nonlinear Dynamics of Two Mutually Long-Delay-Coupled Semiconductor Lasers

et al. 2022

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This study investigates the effects of asymmetric coupling strength on nonlinear dynamics of two mutually long-delay-coupled semiconductor lasers through both experimental and numerical efforts. Dynamical maps and spectral features of dynamical states are analyzed as a function of the coupling strength and detuning frequency for a fixed coupling delay time. Symmetry in the coupling strength of the two lasers, in general, symmetrizes their dynamical behaviors and the corresponding spectral features. Slight to moderate asymmetry in the coupling strength moderately changes their dynamical behaviors from the ones when the coupling strength is symmetric, but does not break the symmetry of their dynamical behaviors and the corresponding spectral features. High asymmetry in the coupling strength not only strongly changes their dynamical behaviors from the ones when the coupling strength is symmetric, but also breaks the symmetry of their dynamical behaviors and the corresponding spectral features. Evolution of the dynamical behaviors from symmetry to asymmetry between the two lasers is identified. Experimental observations and numerical predictions agree not only qualitatively to a high extent but also quantitatively to a moderate extent.

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Section: Dynamics Behaviors Under Symmetric Coupling Strengthmentioning

confidence: 99%

Effects of Asymmetric Coupling Strength on Nonlinear Dynamics of Two Mutually Long-Delay-Coupled Semiconductor Lasers

et al. 2022

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“…Optical chaos is one of the many dynamic characteristics of lasers. It is widely used in optical communication 1,2 , laser radar 3,4 , physical random number generation 5,6 , reservoir computing 7 and other fields. However, there are two problems in the practical application of laser chaotic signal.…”

Section: Introductionmentioning

confidence: 99%

A scheme for broadband multi-channel chaotic signals generation

Yin,

Wang,

et al. 2023

Semiconductor Lasers and Applications XIII

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We propose and experimentally demonstrate a wideband multi-channel chaotic source using a Weak Resonator Cavity Fabry-Perot Laser Diode (WRC-FPLD) with Self-Phase Modulated Optical Feedback (SPMOF), in which, phase modulation is introduced into the external optical feedback loop to improve the bandwidth of the generated multi-channel chaotic signals. The experimental results show that under appropriate optical feedback intensity, WRC-FPLD with SPMOF can generate wideband multi-channel chaotic signals, when the feedback intensity is in the range of -45 dB to -15 dB, the lasing modes in the range of 1530 nm to 1570 nm can be simultaneously driven into chaos state. In addition, the Time Delay Signature (TDS) characteristics of the generated multi-channel chaotic signals are also investigated. To highlight the advantages of the proposed scheme, we also conducted comparative experiments on the conventional optical feedback scheme without phase modulation. Using SPMOF scheme, the obtained bandwidth of multi-channel chaotic signals is improved obviously, the standard bandwidth reaches 11.5 GHz, the TDS of chaotic signal is suppressed to an indistinguishable level. Relative to traditional Fabry-Perot laser diode, WRC-FPLD used in the experiment has a smaller front reflectance, about 1/90 of the rear reflectance, and a longer cavity, so it can excite more lasing modes. The proposed scheme can generate wideband multi-channel chaotic signals with a small mode spacing, which is an ideal light source for the chaotic optical communication system using wavelength division multiplexing technology.

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“…[8,9], brain inspired photon neuromorphic computing [10,11]. Semiconductor laser can exhibit rich dynamic characteristics through optical injection, optical feedback and photoelectric feedback [12][13][14][15][16], and laser chaos is one of the dynamic characteristics of laser that has been widely studied by scholars. In recent years, with the scholar further study of laser chaos, it is found that the output energy of laser is mainly concentrated around the relaxation oscillation frequency.…”

Section: Introductionmentioning

confidence: 99%

Multi-channel chaotic signal generation using a weak resonant cavity Fabry–Perot laser diode subject to self-phase-modulated feedback

Yin,

Wang,

Deng

et al. 2023

Laser Phys. Lett.

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We propose and experimentally demonstrate a wideband multi-channel chaotic source using a weak resonant cavity Fabry–Perot laser diode with self-phase modulated optical feedback. In this configuration, self-phase modulation is incorporated into the external optical feedback loop to enhance bandwidth of the generated multi-channel chaos and suppress time delay signature (TDS). The experimental results indicate that, with appropriate optical feedback intensity, 86 lasing modes within the wavelength range of 1530–1570 nm and with the mode spacing of 0.47 nm can be simultaneously driven into a state of chaos, and the generated multi-channel chaos have an enhanced bandwidth and suppressed TDS.

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High-entropy chaos generation using semiconductor lasers subject to intensity-modulated optical injection for certified physical random number generation

Cited by 22 publications

References 31 publications

Effects of Asymmetric Coupling Strength on Nonlinear Dynamics of Two Mutually Long-Delay-Coupled Semiconductor Lasers

Effects of Asymmetric Coupling Strength on Nonlinear Dynamics of Two Mutually Long-Delay-Coupled Semiconductor Lasers

A scheme for broadband multi-channel chaotic signals generation

Multi-channel chaotic signal generation using a weak resonant cavity Fabry–Perot laser diode subject to self-phase-modulated feedback

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