Instability of an electrooptic bistable device with a delayed feedback

1996

Opt. Eng

Abstract. Digital chaotic behavior in an optically processing element is reported. It is obtained as the result of processing two fixed trains of bits. The process is performed with an optically programmable logic gate, previously reported as a possible main block for optical computing. Outputs for some specific conditions of the circuit are given. Digital chaos is obtained using a feedback configuration. Period doublings in a Feigenbaum-like scenario are obtained. A new method to characterize this type of digital chaos is reported.

Section: Periodic and Chaotic Behaviormentioning

confidence: 92%

Digital chaotic output from an optically processing element

González‐Marcos

1996

Opt. Eng

“…This means that when external time is larger than one order of magnitude than the internal time the situation originates, under certain conditions, a chaotic solution. Furthermore, Okada and Takizawa [17] investigated the effect of a delayed feedback in a hybrid electrooptic system with the restriction that the delay is less than or comparable to the response time of such a system. Neyer and Voges [18], finally, studied the pure effect of the feedback delay on the behaviour of an electrooptic system, neglecting all time constants of the system components.…”

Section: Analysis Of Non-linear Behaviourmentioning

confidence: 99%

Analysis of irregular behaviour on an optical computing logic cell

González-Marcos

Optics & Laser Technology

2000

A new methodology to study irregular behaviours in logic cells is reported. It is based on two types of diagrams, namely phase and working diagrams. Sets of four bits are grouped and represented by their hexadecimal equivalent. Some hexadecimal numbers correspond to certain logic functions. The influence of the internal and external tolerances, namely those appearing in the employed devices and in the working signals, may be analysed with this method. Its importance in the case of logic structures with chaotic behaviours is studied.

“…A non-linear behaviour is expected if some kind of feedback is applied to this cell (Ikeda, 1979), (Okada, 1981), (Neyer, 1982). The feedback we have applied to the system, among the different possibilities, is the one going from the output Oi of Pdevice (see Fig.…”

Section: Chaos Generation From An Oplcmentioning

confidence: 99%

Digital chaos synchronization in optical networks

Gonzales-Marcos

Optical Networks: Design and Modelling

1999

A new method to obtain digital chaos synchronization between two systems is reported. It is based on the use of Optically Programmable Logic Cells as chaos generators. When these cells are feedbacked, periodic and chaotic behaviours are obtained. They depend on the ratio between internal and external delay times. Chaos synchronization is obtained if a common driving signal feeds both systems. A control to impose the same boundary conditions to both systems is added to the emitter. New techniques to analyse digital chaos are presented. The main application of these structures is to obtain secure communications in optical networks.