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Optical Signal. Electric Signal. High Speed Chaos Generated in an Opto-Electronic Oscillator Kristine Callan, Lucas Illing, and Daniel J. Gauthier Duke University, Department of Physics, the Fitzpatrick Center for Photonics and Communication Systems,

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  1. Optical Signal Electric Signal High Speed Chaos Generated in an Opto-Electronic Oscillator Kristine Callan, Lucas Illing, and Daniel J. Gauthier Duke University, Department of Physics, the Fitzpatrick Center for Photonics and Communication Systems, and the Center for Nonlinear and Complex Systems - Durham, North Carolina 27708 - USA Single chaotic device Introduction Observed dynamics Nonlinearity • Time-delayed feedback occurs in many systems • Important at high speeds (time it takes signals to propagate through device ~ time scale of fluctuations) • Simple nonlinear devices can show complex dynamics • We report on a single time-delayed chaotic device • Dynamics change with change in feedback strength, VBias, and length of time delay • Observed multistability and hysterisis effects Laser Modulator Detector VBias Driver Time delay Output Coupler Quasi-periodic Chaotic Periodic Possible Applications Measured output v [mV] • Intrusion detection system • Envisioned system would use network of devices that transmit and receive chaotic signals • Dynamics of system incorporates received signals  high sensitivity • Complex signals  low probability of detection • Chaotic Radar • Current systems use periodic signals to gauge distance to object • Proposed system would send chaotic signal, receive it, and gauge distance from correlation of transmitted and received signal • Light passes through optical fiber to Mach Zehnder Modulator (MZM) • Nonlinear input/output function of MZM modulates light • Detector converts light intensity to RF signal • Electrical signal amplified and fed back to serve as input for MZM • Antenna could be placed at output to transmit signal Time [ns] PSD [dB] Frequency [GHz] V(t - D) [mV] V(t) [mV] Outlook Nonlinearity • Characterize single device dynamics • Characterize dynamics of two coupled devices • Model behavior of network of coupled devices Chaotic Transmitter Poutput / Pinput d Object Correlator Support • US Army Research Office • (grant #W911NF-05-1-0228) VBias [V] Receiver

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