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Journals and Conferences
Chaotic signals have been proposed as broadband information carriers with the potential of providing a high level of robustness and privacy in data transmission. Laboratory demonstrations of chaos-based optical communications have already shown the potential of this technology, but a field experiment using commercial optical networks has not been undertaken… (More)
We present a numerical and experimental evaluation of message encryption by phase modulation, using a chaotic optical carrier generated by a laser subject to delayed optical feedback. This method offers better security than the conventional amplitude masking, where the signal is simply added to the chaotic waveform.
A novel telemetric system based on either differential pulse voltammetry (DPV) or direct current amperometry (DCA) by using a diffused infrared transmission channel is presented. Unlike similar pre-existing instruments based on infrared transmission, the present system works on a single-way communication, thus avoiding problems related to cross-talking… (More)
How language is encoded by neural activity in the higher-level language areas of humans is still largely unknown. We investigated whether the electrophysiological activity of Broca's area correlates with the sound of the utterances produced. During speech perception, the electric cortical activity of the auditory areas correlates with the sound envelope of… (More)
At the simplest level of implementation for an optical system, chaos and complexity are generated by the selfcoupled laser configuration, when the field back-reflected from a remote target is allowed to re-enter in the laser cavity. The delay of the go-and-return path is the parameter governing complexity, and together with the second-order cavity resonance… (More)
We propose a new procedure for evaluating the complex refractive index of a metal film, based on transmission measurements at different incidence angles. The method is simpler and faster than standard ellipsometry and performs the accuracy required for the design of fiber-optic attenuators for telecommunications. As an example, we report on a device showing… (More)
We show theoretically and experimentally that a semiconductor laser driven to chaos by optical feedback may be self-synchronized by reinjection of a delayed replica of its same optical output. The ensuing periodic regularity of the self-synchronized laser output is analyzed.
It is shown that simultaneous pickup of polarographic and electrophysiological signals, which is usually prevented by a severe electrical interference, becomes possible when the polarograph is connected to its electrodes via an optoelectronic link. The sources of interference in simultaneous measurements are discussed, as well as the advantage of breaking… (More)
In this paper, we propose a scheme for multi-user secure data transmission using chaotic lasers. While schemes based on optical chaos are usually restricted to point-to-point transmission, with this new approach, which is derived from the well-known public key cryptography, it is possible to exchange data between any couple of nodes in a network. For each… (More)