Optical chaos generated in semiconductor lasers with intensity-modulated optical injection:a numerical study.

Area of Science:

• Nonlinear Dynamics
• Optoelectronics
• Chaos Theory

Background:

• Semiconductor lasers are key components in optical systems.
• Optical chaos generation is crucial for secure communications and random number generation.
• Intensity-modulated optical injection can destabilize laser dynamics.

Purpose of the Study:

• To numerically investigate optical chaos signal generation using intensity-modulated optical injection.
• To analyze the characteristics of chaos signals, including bandwidth and autocorrelation.
• To explore the effects of injection and modulation parameters on chaotic dynamics.

Main Methods:

• Numerical simulations of a semiconductor laser model.
• Analysis using bifurcation diagrams and 0-1 tests for chaos.
• Systematic investigation of effective bandwidths and autocorrelation functions.

Main Results:

• Chaotic dynamics were successfully excited and located using continuous-wave and IM optical injection.
• Wideband chaotic dynamics were achieved in large injection and modulation parameter regions.
• Limitations in unambiguous range detection were observed in most parameter regions.

Conclusions:

• Intensity-modulated optical injection is an effective method for generating wideband optical chaos signals.
• The proposed scheme offers potential for applications requiring no time-delay signature and broad bandwidth chaos.
• This research facilitates advancements in high-speed chaos communications and random bit generation.