Comparative analysis of chaotic properties of optical chaos generators

Ali, Syed Zafar; Islam, Md. Ariful; Zafrullah, M.

doi:10.1016/j.ijleo.2011.07.010

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…Moreover, security analysis in the proposed chaos-based communication system is done by using the Lyapunov exponents. Larger the values of Lyapunov exponents along the positive side indicates greater security in the communication system [33], [35]. As pulsating chaos shows greater values of Lyapunov exponent along positive side, thus offers better security than non-pulsating chaos [36].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The existing literature has reported two types of chaotic waveforms. Non-pulsating chaos can be produced either by Erbium doped fiber ring laser (EDFRL) arrangements based on nonlinearities or through continuous oscillations produced by semiconductor lasers [33]. Whereas, pulsating chaos can be generated by either modulating the semiconductor lasers or through pump or cavity loss of modulated EDFRLs [34].…”

Section: Mathematical Modelmentioning

confidence: 99%

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Secure EEG Signal Transmission for Remote Health Monitoring Using Optical Chaos

et al. 2019

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For the very first time, we present the use of optical chaos for the secure transmission of electroencephalogram (EEG) signals through optical fiber medium in remote health monitoring systems. In our proposed scheme, a semiconductor laser source is used to generate optical chaos, which hides EEG signal before its transmission over the optical fiber medium. The EEG signals are acquired by using a 14channel Emotiv headset device, which are then processed and rescaled to be compatible with the experimental environment (Optisystem). The mixing of EEG signals and chaos is performed using additive chaos masking scheme, which exhibits certain useful properties such as simplicity and easy recovery of the message. Chaotic data (a combination of EEG signals and chaos) is sent over the optical fiber medium to investigate propagation issues associated with secure EEG signal transmission. The scheme is implemented for long haul communication in which the linear impairments of optical fiber are controlled for successful transmission of the secure signal. The parameters at transmitting and receiving sides are selected to achieve synchronization, such that the transmitted signal could be subtracted from identical chaos to restore the original EEG signal at the receiving side. The scheme is tested for different lengths of the optical fiber cable in which the quality of the received signal is determined by obtaining Q-factors. This scheme could also be used with medical signals such as electrocardiography and electromyography.INDEX TERMS EEG signal, Emotiv, semiconductor laser, optical chaos, additive chaos masking, synchronization, remote health monitoring, long haul.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Secure EEG Signal Transmission for Remote Health Monitoring Using Optical Chaos

et al. 2019

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“…Larger the value of Lyapunov exponents toward positive side means more instability in chaotic waveform . The bandwidth of semiconductor laser chaos is greater than erbium‐doped fiber ring laser, which is beneficial in studying minute details regarding dispersion and nonlinearities effects . In view of the aforementioned factors, pulsed optical chaos produced by direct modulation of semiconductor laser is preferred and is given by laser rate equation

\frac{italicdN ((), t)}{dt} = \frac{I ((), t)}{q ((), V)} - \frac{N ((), t)}{τ_{n}} - g_{o} ((), N ((), t) - N_{t}) \frac{1}{1 + ε S ((), t)} S ((), t)

\frac{italicdS ((), t)}{dt} = normalΓ g_{o} ((), N ((), t) - N_{t}) \frac{1}{1 + ε S ((), t)} S ((), t) - \frac{S ((), t)}{τ_{p}} = \frac{normalΓ β N ((), t)}{τ_{n}}

\frac{d \emptyset}{dt} = \frac{1}{2} α ([], τ g_{o} ((), N ((), t) - N_{t}) - \frac{2}{τ_{p}}),

where

g_{o}

and I ( t ) in Equation are given by

g_{o} = v_{g} a_{o}

I ((), t) = I_{DC} + I_{IN}

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…18 The bandwidth of semiconductor laser chaos is greater than erbium-doped fiber ring laser, which is beneficial in studying minute details regarding dispersion and nonlinearities effects. 19 In view of the aforementioned factors, pulsed optical chaos produced by direct modulation of semiconductor laser is preferred and is given by laser rate equation 20…”

Section: Mathematical Modelmentioning

confidence: 99%

Performance analysis of chaotic FSO communication system under different weather conditions

Niaz

Qamar

Ali

et al. 2018

Trans Emerging Tel Tech

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Free space optics (FSO) is a competent technology for wireless communication providing solutions to bandwidth, cost, and portability challenges in radio frequency communication. This paper presents a numerical approach for securing information in free space by using chaos produced through semiconductor lasers. Laser rate equations are applied to model chaos generated by semiconductor laser, followed by chaos masking scheme to hide the message signal inside the generated chaos before transmission. As FSO communication link availability and efficiency is a major concern in different atmospheric conditions, therefore fog, rain, and haze conditions are analyzed and compared for FSO communication‐based on Q‐factor and eye diagram patterns. The results are further studied for both FSO communication models, ie, with and without applying chaos masking scheme.

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“…To study chaotic behaviour in EDFRL, the laser is modelled as a three level class B laser owing to its fast decay time of polarization variables [11]. Chaos in EDFRL is obtained by either of the following three techniques or a combination of them: pump modulation [12], loss modulation [15] and loop nonlinearities [11]. Pump and loss modulation generated chaotic waveform bandwidths are limited to MHz range due to relaxation oscillation time of fiber laser.…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of 125 GHz wideband chaos in symmetric dual-port EDFRL

et al. 2017

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We study the dynamics of chaos in a dual-port erbium-doped fiber ring laser (EDFRL). The laser consists of two erbium-doped fibers, intracavity filters at 1549.32 nm, isolators, and couplers. At both ports, the laser transitions into the chaotic regime for pump currents greater than 100 mA via the period doubling route. We calculate the largest Lyapunov exponent using Rosenstein's algorithm. We obtain positive values for the largest Lyapunov exponent (≈0.2) for embedding dimensions 5, 7, 9, and 11 indicating chaos. We compute the power spectral density of the photocurrents at the output ports of the laser. We observe a bandwidth of 12.5 GHz at both ports. This ultra-wideband nature of chaos obtained has potential applications in high-speed random number generation and communication.

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Comparative analysis of chaotic properties of optical chaos generators

Cited by 14 publications

References 17 publications

Secure EEG Signal Transmission for Remote Health Monitoring Using Optical Chaos

Secure EEG Signal Transmission for Remote Health Monitoring Using Optical Chaos

Performance analysis of chaotic FSO communication system under different weather conditions

Experimental demonstration of 125 GHz wideband chaos in symmetric dual-port EDFRL

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