Digital chaos synchronization in optical networks

Gonzales-Marcos, A.; Martin-Pereda, Jose Antonio

doi:10.1007/978-0-387-35398-2_18

Cited by 5 publications

(5 citation statements)

References 9 publications

(6 reference statements)

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“…This situation corresponds to two identical and ideal configurations working under identical conditions. We have presented 12 these results previously. In order to recover the information signal, sent together with the chaos, an identical chaos must be subtracted from the incoming signal to the receiver.…”

Section: Synchronization Of Chaotic Oplcsmentioning

confidence: 87%

“…2 shows the final circuit with feedback. According to previous studies 9 " 12 , the situation with more probability to give a periodic or even chaotic solution is when internal delay time is shorter than the external one. In every one of our studied cases, a regular train of pulses has been the input.…”

Section: Chaos Generation From An Oplcmentioning

confidence: 96%

“…Several solutions could be implemented to overcome this fact. We have presented some possible solutions to this problem previousl 12 . The solution adopted in the present case is shown in Fig.…”

Section: Chi(t)mentioning

confidence: 99%

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<title>Optically programmable logic cells as basic units for transmission and synchronization of chaotic signals</title>

González‐Marcos

Martin-Pereda

2001

SPIE Proceedings

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We proposed an optical communications system, based on a digital chaotic signal where the synchronization of chaos was the main objective, in some previous papers. In this paper we will extend this work. A way to add the digital data signal to be transmitted onto the chaotic signal and its correct reception, is the main objective. We report some methods to study the main characteristics of the resulting signal. The main problem with any real system is the presence of some retard between the times than the signal is generated at the emitter at the time when this signal is received. Any system using chaotic signals as a method to encrypt need to have the same characteristics in emitter and receiver. It is because that, this control of time is needed. A method to control, in real time the chaotic signals, is reported.

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Section: Synchronization Of Chaotic Oplcsmentioning

confidence: 87%

Section: Chaos Generation From An Oplcmentioning

confidence: 96%

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<title>Optically programmable logic cells as basic units for transmission and synchronization of chaotic signals</title>

González‐Marcos

Martin-Pereda

2001

SPIE Proceedings

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“…Last function of Boolean algebra is the exclusive OR (XOR) which can be done with NAND and NOR gates. XOR function it has been since the 60's very important for data codification [6] and still used in communications applications [18]. In order to obtain this last function, the internal configuration of our OPLC [1] can be demonstrated applying double value to our input digital data.…”

Section: P-devicementioning

confidence: 99%

Boolean logic device done with DFB laser diode

2004

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We present simulation results on how power output-input characteristic Instability in Distributed FeedBack -DFB semiconductor laser diode SLA can be employed to implemented Boolean logic device. Two configurations of DFB Laser diode under external optical injection, either in the transmission or in the reflective mode of operation, is used to implement different Optical Logic Cells (OLCs), called the Q-and the P-Device OLCs. The external optical injection correspond to two inputs data plus a cw control signal that allows to choose the Boolean logic function to be implement. DFB laser diode parameters are choosing to obtain an output-input characteristic with the values desired. The desired values are mainly the on-off contrast and switching power, conforming shape of hysteretic cycle. Two DFB lasers in cascade, one working in transmission operation and the other one in reflective operation, allows designing an inputoutput characteristic based on the same respond of a self-electrooptic effect device is obtained. Input power for a bit'T' is 35 uW(70uW) and a bit "0" is zero for all the Boolean function to be execute. Device control signal range to choose the logic function is 0-140 uW (280 uW). Q-device (P-device) Keywords: semiconductor laser, DFB laser diode, optical logic device, optical computing INTRODUCCIÓNLogic functions have been the cornerstone of a large number of systems and architectures, both in optical computing and in photonic switching. In most of the cases, these functions have been obtained either from specific devices with bistable characteristics or from hybrid configurations emulating this behaviour. Self-Electro optic Effect Devices (SEED) and etalon-like configurations have been extensively employed. Their main advantages are the possibility to obtain very fast switching times and their change in optical properties according to the employed wavelength. But these devices are sometimes difficult to find and their characteristics may greatly differ from one particular type to another. It is because that in this paper we present the possibility to obtain similar behaviour as the above mentioned specific devices, SEED or "on-off, with other devices commonly used in optical communications, namely, laser diodes. This line has been reported some years ago but the present intention is to present the real behaviour of these structures when a non-linear characteristic is need. The main objective of this paper is analyze the nonlinear properties of DFB laser amplifier and the way it can work as an elemental building block to construct Boolean Logic Functions as the authors of this paper have reported previously with conventional bistable devices. We have been working on the design of optical structures to be applied as Boolean logic function for optical computing and optical switching and routing for optical communications. Our previous work was based on the definition of this logic structure using the methodology of simulation by functional model, and experimentally has been done with an optoel...

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“…As a matter of fact, under certain conditions they offer the possibility to present an irregular output than, in some cases, becomes chaotic. These types of signals are potentially good candidates to be employed in secure systems if both, emitter and receiver are synchronised [7], It is because that a deep knowledge of the internal behaviour of these structures is needed. If it is important to know their working conditions when they are employed in computational structures, these conditions are even more important if they are employed in communications systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of irregular behaviour on an optical computing logic cell

González-Marcos

Martin-Pereda

2000

Optics & Laser Technology

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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.

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Digital chaos synchronization in optical networks

Cited by 5 publications

References 9 publications

<title>Optically programmable logic cells as basic units for transmission and synchronization of chaotic signals</title>

<title>Optically programmable logic cells as basic units for transmission and synchronization of chaotic signals</title>

Boolean logic device done with DFB laser diode

Analysis of irregular behaviour on an optical computing logic cell

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