Experiments on chaos synchronization in two separate microchip lasers

Uchida, Atsushi; Shinozuka, M.; Ogawa, Takeshi; Kannari, Fumihiko

doi:10.1364/ol.24.000890

Cited by 41 publications

(15 citation statements)

References 17 publications

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“…The present system is more complicated than a simple pump [5,12] or loss modulation and in fact the experimental results are different from those in [5,12]. This may result from the self-mixing feedback effect which we have explained above.…”

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confidence: 70%

“…The clock timing of information bits is typically a key factor in a communication system, so, a termination of phase diffusion is crucial in an application to encoded communication. Although chaos synchronization has been demonstrated in electronic systems [2,9], including single-chip systems [10] as well as laser systems [3,5,11,12], the role of phase in chaos synchronization has not yet been clarified and more experimental schemes are desired to find potential applications to signal processings.…”

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confidence: 99%

“…The distance between the LNP laser and the turntable was 50 cm. The distinct difference between the present system and the pump (or loss) modulation scheme [5,12] is that the self-mixing feedback modulation depends upon whether or not the two coupled lasers are locked and on each laser's own intensity. The perturbation to the laser system is unidirectional and no feedback action occurs in the usual pump (or loss) modulation scheme.…”

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confidence: 99%

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Synchronization of Mutually Coupled Self-Mixing Modulated Lasers

et al. 2000

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Synchronization of mutually coupled chaotic lasers has been demonstrated in a microchip LiNdP4O12 laser array with self-mixing feedback modulation. An abrupt transition to synchronized chaos by way of "phase squeezing" was observed when coupling between the two lasers was increased. This phenomenon is well reproduced by numerical calculations using model equations. It is also shown that low energy variation as well as high disorder are concurrently established in synchronized chaos.

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confidence: 99%

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Synchronization of Mutually Coupled Self-Mixing Modulated Lasers

et al. 2000

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“…By using the synchronization of optical chaos the available bandwidth can be extended up to 0375 hundreds of megahertz. Information encoding and decoding was studied in semiconductor lasers [31,32], solid state lasers [33], fiber-ring lasers [34] and in microchip lasers [35]. Quality of message encoding and decoding also depends on the choice of coupling scheme between the transmitter and the receiver laser systems.…”

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Synchronization and control of chaos in coupled chaotic multimode Nd:YAG lasers

et al. 2008

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In this Letter we numerically investigate the dynamics of a system of two coupled chaotic multimode Nd:YAG lasers with two mode and three mode outputs. Unidirectional and bidirectional coupling schemes are adopted; intensity time series plots, phase space plots and synchronization plots are used for studying the dynamics. Quality of synchronization is measured using correlation index plots. It is found that for laser with two mode output bidirectional direct coupling scheme is found to be effective in achieving complete synchronization, control of chaos and amplification in output intensity. For laser with three mode output, bidirectional difference coupling scheme gives much better chaotic synchronization as compared to unidirectional difference coupling but at the cost of higher coupling strength. We also conclude that the coupling scheme and system properties play an important role in determining the type of synchronization exhibited by the system.

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“…Nonlinear dynamics in Optics (laser dynamics, large delay optical or optoelectronic cavities) were well known for their ability to produce high complexity dynamics. Different groups revisited independently various such optical systems for application to chaos encryption systems, from the theoretical point of view [4] (external cavity semiconductor laser), and from the experimental point of view as well [5] (synchronization of chaotic external cavity semiconductor lasers; [6], encryption/decryption with chaotic Erbium doped fiber lasers; [7], encryption/decryption with chaotic laser wavelength; [8], synchronized chaos in microchip lasers; [9], GHz synchronization between external cavity semiconductor lasers). All of these results were obtained with optical systems, due to the following reasons:…”

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Encryption using chaotic dynamics for optical telecommunications

Larger

Goedgebuer

2004

Comptes Rendus. Physique

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Chaos-based encryption appeared recently in the early 1990s as an original application of nonlinear dynamics in the chaotic regime. While the first experimental realizations were made in Electronics, the Optics community rapidly showed a strong interest in this new scientific application due to the well-known feature of Optics in the area of nonlinear phenomena. Numerous optical demonstrations have been performed, involving chaotic dynamics with particularly interesting properties in terms of chaos complexity, and also in terms of bandwidth i.e., encryption speed. This special issue gives a review of most of the current works on optical chaos dedicated to encryption. To cite this article: L. Larger, J.-P. Goedgebuer, C. R. Physique 5 (2004).  2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. RésuméDynamiques Chaotiques Appliquées à la cryptographie pour les télécommunications optiques. La cryptographie par chaos est apparue récemment au début des années 90, comme une application originale des dynamiques non linéaires en régime chaotique. Alors que les premières réalisations ont été mises en oeuvre à partir de circuits électroniques, l'optique s'est rapidement intéressée au sujet. Grâce à des propriétés physiques particulières et familières dans le domaine de l'Optique, de nombreux démonstrateurs originaux et variés ont été développés, fonctionnant avec des dynamiques chaotiques aux propriétés attractives, tant en terme de complexité des régimes chaotiques, qu'en terme de bande passante, et donc de vitesse de codage. Ce numéro spécial passe en revue la plupart des travaux actuels sur les systèmes cryptographiques par chaos en optique. Pour citer cet article : L. Larger, J.-P. Goedgebuer, C. R. Physique 5 (2004).

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Experiments on chaos synchronization in two separate microchip lasers

Cited by 41 publications

References 17 publications

Synchronization of Mutually Coupled Self-Mixing Modulated Lasers

Synchronization of Mutually Coupled Self-Mixing Modulated Lasers

Synchronization and control of chaos in coupled chaotic multimode Nd:YAG lasers

Encryption using chaotic dynamics for optical telecommunications

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