Analysis of irregular behaviour on an optical computing logic cell

Abstract

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.

Method to analyze the influence of hysteresis in optical arithmetic units

“…The reported method, employed together with methods previously reported by us to study the influence of small variations in the input signals on the obtained final logic functions, 4 may be of great utility for studying the behavior of any optical computing configuration. From an experimental point of view, the influence of possible changes in the characteristics of the employed devices may be known.…”

“…Its behavior when performing logic functions was studied in a previous paper. 4 In that case, the intended objective was only an analysis of the simple optical logic cell in performing logic operations. The basis of the method employed was a 3-D working diagram where the axes represented control-signal values and tolerances of input signals.…”

“…Its resulting irregular behavior was analyzed with fractal concepts. 4 The application of this cell to circuits such as the half and full adder will constitute the first part of this paper. The second part will be devoted to the influence of the tolerance of the elementary devices on these arithmetic operations.…”

Optical digital chaos cryptography

“…A dynamical system with an external feedback is responsible for generating chaos. However, to obtain a chaotic behavior, the external delay must be chosen in terms of the internal delay (9). The OPLC is a general-purpose logic cell that allows obtaining all the Boolean Logic functions.…”

Neural Processing Unit based on the Optical Bistable Properties of Semiconductor Laser Amplifiers

“…Moreover, as it was shown, this circuit has the possibility to the generation of periodic and even chaotic solutions [6]- [7], The main working conditions and results obtained from this cell are summarized in Table I. Table I, that most of the main properties of single neurons, as well as those coming from groups of neurons, are possible to be obtained from the operations achieved by the present unit.…”