Random Number Generation From Intermittent Optical Chaos

Bosco, Andreas Karsaklian Dal; Sato, Naoki; Terashima, Yuta; Ohara, Shoma; Uchida, Atsushi; Harayama, Takahisa; Inubushi, Masanobu

doi:10.1109/jstqe.2017.2708608

Cited by 17 publications

(12 citation statements)

References 30 publications

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“…© 2017 Optical Society of America Semiconductor lasers subject to perturbations exhibit a wide range of nonlinear dynamics for the generation of a number of photonic microwave signals [1][2][3][4]. The most investigated perturbation is through optical feedback because of the simplicity as well as the high dimensionality [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Optical feedback induces nonlinear dynamics as in the stable, periodic, quasiperiodic, and chaotic states.…”

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confidence: 99%

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Tunable switching between stable and periodic states in a semiconductor laser with feedback

2017

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Feedback-induced switching between two nonlinear dynamical states is observed in a semiconductor laser. The single-mode laser is subject to optical feedback in the long-cavity regime. In every round-trip time τ, the feedback is found to switch the laser from a stable state to a periodic state. The stable state corresponds to a continuous-wave emission at a single optical frequency. The periodic state corresponds to emission at another optical frequency with sidebands generated from a sustained relaxation oscillation. Such regular switching between the stable and periodic states is first unveiled numerically. Experimentally, the resultant intensity time series is confirmed as comprising of a square-wave envelope repeating in τ, which is modulated on a microwave carrier near the relaxation resonance frequency. Additionally, the duty cycle for the periodic state is found as continuously tunable by adjusting the feedback strength. The tunable state switching is applicable to square-wave modulated photonic microwave generation.

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confidence: 99%

“…It is applicable to optical digital signal processing or clock generation [35,36]. Recently, switching between chaotic and laminar dynamical states was observed in a single-mode laser by using a photonic integrated circuit to realize on-chip feedback [15,16]. However, as a phenomenon of intermittency, the switching does not occur regularly [15,16].…”

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confidence: 99%

Tunable switching between stable and periodic states in a semiconductor laser with feedback

2017

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“…More generally, our system shows a dynamics that is made of transition between quiescent and non-stationary states. Such a dynamic in optics has been lately of interest for random number generation [10] and for all-optical flip-flop system [26].…”

Section: Resultsmentioning

confidence: 99%

“…optical communication, polarization switching found interest in optical routing [5], clock recovery [6], secure communication [7], and random number generation [8]. Randomly occurring switching can be triggered by noise [9] or inherent to a chaotic dynamic [10]. On the other hand, periodic switching can be achieved through optical pulse pumping [11,12] and optical injection [13], and with polarization rotation of a feedback light [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Sustained oscillations accompanying polarization switching in laser dynamics

Uy¹,

Weicker²,

Rontani³

et al. 2018

Opt. Express

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We report experimentally and theoretically the emergence of sustained oscillations over a slow and periodic polarization switching in a laser subjected to polarization rotated optical feedback. This phenomenon originates from a clear bifurcation point that marks the transition between sustained and damped oscillations on the plateaus. Analytical study reveals also that the frequency of this new oscillatory dynamics is independent of the time delay.

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“…As monolithically integrated optical devices, Photonic Integrated Circuits (PICs) have been fabricated recently [16], which is suitable for the applications of random number generation [17][18][19][20][21] and secure key distribution [22]. The external cavity length plays an important role in laser dynamics with time-delayed optical feedback [23,24].…”

Section: Introductionmentioning

confidence: 99%

Numerical study on dynamics-dependent synchronization in mutually-coupled lasers with asymmetric feedback

Ohara

Kanno

Uchida

2019

NOLTA

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We numerically investigate the change in synchronization property in different frequency components associated with laser dynamics, which is termed dynamics-dependent synchronization, in two mutually-coupled semiconductor lasers. We introduce an optical amplifier to implement asymmetric feedback, and we change the feedback strength of one of the two coupled lasers to observe dynamics-dependent synchronization. In-phase synchronization is observed for the original signals, while anti-phase synchronization is found for the low-passfiltered signals, in the presence of low-frequency fluctuation dropouts. We analyze dynamicsdependent synchronization by observing temporal changes in the short-term cross-correlation and the local optical frequency detuning.

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Random Number Generation From Intermittent Optical Chaos

Cited by 17 publications

References 30 publications

Tunable switching between stable and periodic states in a semiconductor laser with feedback

Tunable switching between stable and periodic states in a semiconductor laser with feedback

Sustained oscillations accompanying polarization switching in laser dynamics

Numerical study on dynamics-dependent synchronization in mutually-coupled lasers with asymmetric feedback

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