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Directly modulated semiconductor lasers; delayed optoelectronic feedback; chaotic dynamics.

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.

Bindu M Krishna¹ Manu P John² V M Nandakumaran²

1. Sophisticated Test and Instrumentation Centre; Cochin University of Science and Technology, Cochin 682 022, India
2. International School of Photonics, Cochin University of Science and Technology, Cochin 682 022, India

Published

December 2008

Manuscript received

30 October 2007

Accepted

17 July 2008

Early published

20 August 2008