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

TL;DR

This study numerically investigates how positive and negative delayed optoelectronic feedback influence chaotic dynamics in directly modulated InGaAsP semiconductor lasers, highlighting the superior effectiveness of negative feedback in inducing chaos.

Contribution

It provides a comparative analysis of positive and negative feedback effects on chaos in semiconductor lasers, emphasizing the practical advantages of negative feedback configurations.

Findings

Negative feedback more effectively induces chaos.

Chaotic behavior confirmed by bifurcation diagrams and Lyapunov exponents.

Optimal nonlinear gain reduction range identified.

Abstract

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.