Suppression of chaos in a directly modulated semiconductor laser with delayed optoelectronic feedback

Rajesh, S.; Nandakumaran, V M

doi:10.1016/j.physleta.2003.10.032

Cited by 13 publications

(11 citation statements)

References 36 publications

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“…This system exhibits chaotic dynamics only for nonlinear gain reduction below 0.01 [27]. A positive-delayed optoelectronic feedback combined with strong current modulation is found to suppress chaotic dynamics and bistability in semiconductor lasers [28,29]. Chaotic synchronization of two such lasers with low values of nonlinear gain reduction factor is achieved and successfully applied for unidirectional optical secure communication [30,31].…”

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confidence: 96%

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Bidirectional communication using delay coupled chaotic directly modulated semiconductor lasers

2010

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Abstract. Chaotic synchronization of two directly modulated semiconductor lasers with negative delayed optoelectronic feedback is investigated and this scheme is found to be useful for efficient bidirectional communication between the lasers. A symmetric bidirectional coupling is identified as a suitable method for isochronal synchronization of such lasers. The optimum values of coupling and feedback strength that can provide maximum quality of synchronization are identified. This method is successfully employed for encoding/decoding both analog and digital messages. The importance of a symmetric coupling is demonstrated by studying the variation of decoding efficiency with respect to asymmetric coupling.

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confidence: 96%

“…view in secure communication [27][28][29][30][31][32][33][34][35][36][37][38]. However, the mode gain reduction occurring in such systems due to nonlinear processes suppresses chaotic dynamics [27].…”

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confidence: 99%

Bidirectional communication using delay coupled chaotic directly modulated semiconductor lasers

2010

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“…The other technique involves a high bandwidth photodetector for optoelectronic conversion of the laser output and the injection of a suitably amplified detector signal into the pumping current of the SL. Even when the nonlinear gain reduction is strong enough to inhibit period doubling and chaos in current modulated semiconductor lasers [18], delay feedback has been proved to induce bifurcations and chaos [19]. Destabilization of the fixed point by Hopf bifurcation in SLs with optoelectronic feedback has been reported in many works [15,17].…”

Section: Introductionmentioning

confidence: 99%

Analysis and simulation of semiconductor laser dynamics with optoelectronic delay feedback

Varghese¹,

Rajesh²,

Nandakumaran³

2015

Turk J Phys

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Abstract:In this work we investigate semiconductor laser dynamics with optoelectronic delay feedback, both analytically and numerically. Stability criteria are derived from the delay differential equations of the system. Stability curves are obtained in the feedback strength-delay parameter space. We show that delay has a role in determining the stability only for a range of feedback strength and this range can vary depending on other parameters. Effects of bias current and nonlinear gain reduction on the stability curves are shown in the analysis and numerically verified.

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“…A bi-directional coupling between two such lasers is also found to suppress chaotic dynamics [36]. A positive-delayed optoelectronic feedback combined with strong current modulation is found to suppress chaotic dynamics and bistabily in semiconductor lasers [37,38]. The effect of such a combination in inducing chaotic dynamics through a quasiperiodic route in quantum-well lasers also has been studied [25].…”

Section: Introductionmentioning

confidence: 99%

Performance characteristics of positive and negative delayed feedback on chaotic dynamics of directly modulated InGaAsP semiconductor lasers

2008

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The chaotic dynamics of directly modulated semiconductor lasers with delayed optoelectronic feedback is studied numerically. The effects of positive and negative delayed optoelectronic feedback in producing chaotic outputs from such lasers with nonlinear gain reduction in its optimum value range is investigated using bifurcation diagrams. The results are confirmed by calculating the Lyapunov exponents. A negative delayed optoelectronic feedback configuration is found to be more effective in inducing chaotic dynamics to such systems with nonlinear gain reduction factor in the practical value range.

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Suppression of chaos in a directly modulated semiconductor laser with delayed optoelectronic feedback

Cited by 13 publications

References 36 publications

Bidirectional communication using delay coupled chaotic directly modulated semiconductor lasers

Bidirectional communication using delay coupled chaotic directly modulated semiconductor lasers

Analysis and simulation of semiconductor laser dynamics with optoelectronic delay feedback

Performance characteristics of positive and negative delayed feedback on chaotic dynamics of directly modulated InGaAsP semiconductor lasers

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