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: 7.73). 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.

1 Follower
  • Source
    [Show abstract] [Hide abstract]
    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.
    Journal of Lightwave Technology 10/2014; 32(20):3595-3601. DOI:10.1109/JLT.2014.2320371 · 2.86 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Photonic generation of wideband chaotic signals with time delay signature elimination is investigated experimentally and numerically based on a semiconductor laser (slave laser) with chaotic optical injection from a master laser. The master laser is subject to moderate optical feedback where the feedback strength and external-cavity length are fixed, while the slave laser stands alone. The experimental results show that wideband chaotic signals with successful time delay concealment can be generated in the slave laser by simply adjusting the coupling strength and frequency detuning between the two lasers. Furthermore, the numerical results are in accordance with the experimental observations. Finally, we propose a simple method for simultaneously generating multiple streams of high-quality chaotic signals using multichaotic lasers, where the time delay is effectively concealed in the autocorrelation function and delayed mutual information calculated from the chaotic time series.
    IEEE Journal of Quantum Electronics 10/2012; 48(10):1339-1345. DOI:10.1109/JQE.2012.2210391 · 2.11 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We propose a method for testing wire fault using a chaotic signal. The fault is detected by correlating the chaotic signal back-reflected from the fault with its delayed duplicate. Centimeter-level spatial resolution and antijamming can be achieved, benefiting from the broadband and randomness of the chaotic waveform. We experimentally proved that our method can be used to locate the impedance discontinuities of several different kinds of electric cables. Preliminary experiments obtained 0.5-m resolution with a data acquisition bandwidth of 120 MHz. Further, we demonstrate the ability for testing live wires using our method.
    IEEE Electron Device Letters 04/2011; 32(3-32):372 - 374. DOI:10.1109/LED.2010.2097237 · 3.02 Impact Factor