Showing papers by "Apostolos Argyris published in 2006"
TL;DR: A thorough study of an all-optical chaotic communication system, including experimental realization real-world testing and performance characterization through bit-error-rate analysis, showed that chaotic communication systems does not act as a considerably deteriorating factor in the final performance.
Abstract: A thorough study of an all-optical chaotic communication system, including experimental realization real-world testing
and performance characterization through bit-error-rate analysis, is presented. Pseudorandom data that are effectively
encrypted in the chaotic emitter and sent for transmission are recovered at the receiver with bit-error-rate (BER) values
as low as 10-7 for 1 Gb/s data rate. Different data code lengths and bit-rates at the Gb/s region have been tested. Optical
transmission using 100km fiber spools in an in-situ experiment and 120km in an installed optical network showed that
chaotic communication systems does not act as a considerably deteriorating factor in the final performance.
399 citations
TL;DR: In this paper, two decoding methods of an all-optical chaotic communication system are investigated when chaotic modulation (CM) encoding format is employed, and the performance of the system is then evaluated by means of calculating the Q-factor extracted by the eye diagram of the recovered data when two different approaches of the decoding process for the receiver are adopted.
Abstract: Two different decoding methods of an all-optical chaotic communication system are investigated when chaotic modulation (CM) encoding format is employed. The transmitter consists of an external cavity semiconductor laser generating, thus, a chaotic carrier, modulated using an external modulator. The receiver is either a solitary semiconductor laser diode identical to that of the transmitter or a laser diode coupled to an external cavity, forming an open- or a closed-loop configuration, respectively. The performance of the system is then evaluated by means of calculating the Q-factor extracted by the eye diagram of the recovered data when two different approaches of the decoding process for the receiver are adopted. The first decoding method relies on the widely proposed, normalized to the receiver's amplitude output, difference of the two lasers' optical amplitude outputs, while the second one corresponds to a more realistic case by subtracting the electrical current outputs of two p-i-n photodiodes coupled to the transmitter and receiver laser correspondingly. By comparing the numerical results extracted by the two decoding methods and for various cases of interest, such as employing open- or closed-loop configuration for several message bit rates and different lasers' driving current, it will be shown that, under certain circumstances, the two decoding methods result in significantly different results.
49 citations
01 Sep 2006
TL;DR: The transmission impairments induced by the optical medium in optical communication systems that employ chaotic carrier data encryption are discussed after theoretical consideration and experimental evaluation.
Abstract: The transmission impairments induced by the optical medium in optical communication systems that employ chaotic carrier data encryption are discussed after theoretical consideration and experimental evaluation.
1 citations
TL;DR: In this paper, the polarization dynamics in VCSELs subject to a time-delayed optical feedback from a short external cavity were investigated and the emergence of pulse packages exhibiting characteristics which originate from the interplay of time-delay induced dynamics and polarization mode competition.