Synchronization and communication with chaotic laser systems

Uchida, Atsushi; Rogister, Fabien; García‐Ojalvo, Jordi; Roy, Rajarshi

doi:10.1016/s0079-6638(05)48005-1

Cited by 71 publications

(54 citation statements)

References 277 publications

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“…One contribution of 13 to a Theme Issue 'Delayed complex systems '. This journal is © 2010 The Royal Society mechanical scenarios on nano-to macroscopic spatial scales (Argyris et al 2005(Argyris et al , 2008Kouomou et al 2005;Uchida et al 2005Uchida et al , 2008Illing et al 2007;Yousefi et al 2007;Cohen et al 2008;Sorrentino & Ott 2008, 2009aReidler et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Complex dynamics and synchronization of delayed-feedback nonlinear oscillators

Murphy

Cohen

Ravoori

et al. 2010

Phil. Trans. R. Soc. A.

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We describe a flexible and modular delayed-feedback nonlinear oscillator that is capable of generating a wide range of dynamical behaviours, from periodic oscillations to high-dimensional chaos. The oscillator uses electro-optic modulation and fibre-optic transmission, with feedback and filtering implemented through real-time digital signal processing. We consider two such oscillators that are coupled to one another, and we identify the conditions under which they will synchronize. By examining the rates of divergence or convergence between two coupled oscillators, we quantify the maximum Lyapunov exponents or transverse Lyapunov exponents of the system, and we present an experimental method to determine these rates that does not require a mathematical model of the system. Finally, we demonstrate a new adaptive control method that keeps two oscillators synchronized, even when the coupling between them is changing unpredictably.

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Section: Introductionmentioning

confidence: 99%

Complex dynamics and synchronization of delayed-feedback nonlinear oscillators

Murphy

Cohen

Ravoori

et al. 2010

Phil. Trans. R. Soc. A.

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“…In this regard, synchronization between coupled chaotic lasers is vitally important (Colet & Roy 1994;VanWiggeren & Roy 1998;Uchida et al 2005). In fact, a private key secure communication system over a distance of 120 km in a public fibre-optic communication network has recently been demonstrated with chaotic semiconductor lasers in a master-slave configuration (Argyris et al 2005).…”

Section: Introductionmentioning

confidence: 99%

On chaos synchronization and secure communication

Kinzel

Englert

Kanter

2010

Phil. Trans. R. Soc. A.

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Chaos synchronization, in particular isochronal synchronization of two chaotic trajectories to each other, may be used to build a means of secure communication over a public channel. In this paper, we give an overview of coupling schemes of Bernoulli units deduced from chaotic laser systems, different ways to transmit information by chaos synchronization and the advantage of bidirectional over unidirectional coupling with respect to secure communication. We present the protocol for using dynamical private commutative filters for tap-proof transmission of information that maps the task of a passive attacker to the class of non-deterministic polynomial time-complete problems.

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“…The next step is to introduce and encode a message at one of the lasers and try to recover it at another one. We are going to use a standard encryption method known as Chaos Shift Keying (CSK) [5]. This technique is based in the chaos-pass filtering properties of the chaotic systems.…”

Section: Bidirectional Communicationmentioning

confidence: 99%

“…Since the seminal work of Cuomo and Oppenheim [1] demonstrating the potential of chaotic systems for information encoding, communications through chaotic carriers have been increasingly studied [2,3,4,5]. Despite being first implemented in electronic circuits, the technological importance of optical communications have recommended the use of chaotic lasers as emitters and receivers in chaos-based communication systems [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Synchronization in Semiconductor Laser Rings

Buldú

Torrent

García-Ojalvo

2007

J. Lightwave Technol.

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We examine the dynamics of semiconductor lasers coupled in a ring configuration. The lasers, which have stable output intensity when isolated, behave chaotically when coupled unidirectionally in a closed chain. In this way, we show that neither feedback nor bidirectional coupling is necessary to induce chaotic dynamics at the laser output. We study the synchronization phenomena arising in this particular coupling architecture, and discuss its possible application to chaos-based communications. Next, we extend the study to bidirectional coupling and propose an appropriate technique to optical chaos encryption/decryption in closed chains of mutually coupled semiconductor lasers.

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Synchronization and communication with chaotic laser systems

Cited by 71 publications

References 277 publications

Complex dynamics and synchronization of delayed-feedback nonlinear oscillators

Complex dynamics and synchronization of delayed-feedback nonlinear oscillators

On chaos synchronization and secure communication

Synchronization in Semiconductor Laser Rings

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