Article

Photonic Integrated Device for Chaos Applications in Communications

Optical Communications Laboratory, Department of Informatics and Telecommunications, University of Athens, Panepistimiopolis, Illisia, Athens, Greece.
Physical Review Letters (Impact Factor: 7.51). 05/2008; 100(19):194101. DOI: 10.1103/PhysRevLett.100.194101
Source: PubMed

ABSTRACT

A novel photonic monolithic integrated device consisting of a distributed feedback laser, a passive resonator, and active elements that control the optical feedback properties has been designed, fabricated, and evaluated as a compact potential chaotic emitter in optical communications. Under diverse operating parameters, the device behaves in different modes providing stable solutions, periodic states, and broadband chaotic dynamics. Chaos data analysis is performed in order to quantify the complexity and chaoticity of the experimental reconstructed attractors by applying nonlinear noise filtering.

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    • "We repeat this process 500 times and take the average of these 500 eigenvalues as the second largest eigenvalue of WS network for that value of p. We repeat this process for different rewiring probability p ∈[0,1]and coupling strength c ∈[0,1]and these second largest eigenvalues of G for WS networks are plotted in Fig. 7. It can be seen that the second largest eigenvalue decreases with increase in either rewiring probability p or coupling strength c or both. "
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    ABSTRACT: We study the usefulness of coupled redundancy as a mechanism for reduction in local noise in coupled map lattices and investigate the role of network topology, coupling strength, and iteration number in this mechanism. Explicit numerical simulations to measure noise reduction in coupled units connected in different topologies such as ring, star, small-world, random, and grid networks have been carried out. We study both symmetric and asymmetric networks. Linear stability analysis is presented to identify an optimal symmetric topology. The effect of rewiring is also investigated, and we find that dynamic links enhance the noise reduction capabilities.
    Full-text · Article · Jan 2016 · Nonlinear Dynamics
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    • "Yousefi et al. reported a perioddoubling transition into chaos in MISLs and demonstrated that the dynamics of MISLs are more stable over the lifetime of the system compared with their stand-alone counterparts [6]. Argyris et al. designed and fabricated a novel four-section MISL, which can be used as a compact potential chaotic emitter in optical communication [7]. Wu et al. reported broadband chaos generation in a three-section MISL, where the generated chaos signal possesses significant dimension and complexity [8]. "
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    ABSTRACT: Influences of external optical injection on the nonlinear dynamics of a three-section monolithically integrated semiconductor laser (MISL) are investigated experimentally. The results show that, for the solitary three-section MISL, diversely dynamical states including the stable state as well as the so-called period-one, period-two, multi-period, and chaotic states can be observed through adjusting the currents of the gain section (I G) and the phase section (I P). However, the chaotic operation region of the solitary MISL in the parameter space of I G and I P is very small and found to exist when 21.28 mA < I G < 26.40 mA and 31 mA < I P < 37 mA. After introducing an external optical injection, the MISL originally operating at other dynamical states can always be driven into chaotic state under suitable injection strength and frequency detuning, and a relatively large I G will be helpful for obtaining broad and continuous chaotic regions in the parameter space of injection strength and frequency detuning.
    Full-text · Article · Oct 2015 · IEEE Photonics Technology Letters
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    • "Chaos generators based on MISL (a DFB laser integrated with a passive resonator) were also demonstrated [3], [22], [23]. Due to the long-length resonator design (10650-μm for Ref. [3], [22] and 10700-μm for Ref. [23]), the chaos bandwidth values were limited below 10 GHz. "
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    ABSTRACT: The dynamics of monolithically integrated amplified feedback lasers (AFL) is investigated through numerical simulation and experimental verification. The period-doubling route to chaos and high-frequency microwave generation are demonstrated through simulation. Then, we design and fabricate monolithically integrated AFLs. Mappings of dynamic states and oscillation frequency in the parameter space of phase section current $I_{rm P}$ and amplifier section current $I_{rm A}$ are depicted. For relative small $I_{rm A}$, the period doubling evolution to chaos is presented with the increase of $I_{rm P}$ . For the relative large $I_{rm A}$, a high-frequency mode-beating (M-B) pulsation can be observed under suitable value of $I_{rm P}$. The oscillation frequency of period-one is about 10 GHz and the frequency of M-B pulsation is over 40 GHz for the device with a total length of 780 μm.
    Full-text · Article · Oct 2014 · Journal of Lightwave Technology
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