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Tunable vertical-cavity surface-emitting laser with feedback to implement a pulsed neural model. 2. High-frequency
Alexandre R S Romariz1, Kelvin H Wagner
1Departamento de Engenharia Elétrica, Universidade de Brasília, Distrito Federal, Brazil. romariz@ene.unb.br
Applied Optics
|July 5, 2007
Summary
This study extends optoelectronic neural models to higher frequencies, incorporating thermal effects in vertical-cavity surface-emitting lasers. The research reveals resonance properties and novel dynamic behaviors in these advanced artificial neurons.
Area of Science:
- Optoelectronics
- Computational Neuroscience
- Laser Physics
Background:
- Optoelectronic dynamic neural models offer a promising avenue for neuromorphic computing.
- Understanding frequency limitations and thermal effects is crucial for practical implementation.
- Existing models like the FitzHugh-Nagumo equations provide a foundation but may not capture all behaviors.
Purpose of the Study:
- To extend the operational frequency of an optoelectronic dynamic neural model.
- To investigate the impact of thermal effects in vertical-cavity surface-emitting lasers (VCSELs) on model performance.
- To explore novel dynamic behaviors and optical coupling in these artificial neurons.
Main Methods:
- Implementation of an optoelectronic dynamic neural model.
- Development and application of a simplified thermal effects model for VCSELs.
- Conducting experiments and numerical simulations to analyze model behavior.
- Investigating optical coupling between two artificial neurons.
Main Results:
- The extended model successfully operates at higher frequencies.
- The thermal effects model accurately predicts qualitative changes in nonlinear mapping with frequency.
- Observed resonance properties and additional dynamic effects beyond the FitzHugh-Nagumo equations.
- Demonstrated optical coupling between pulsing artificial neurons.
Conclusions:
- Optoelectronic neural models can be extended to higher frequencies by accounting for thermal effects.
- VCSEL-based artificial neurons exhibit complex dynamics and resonance phenomena.
- Optical coupling enables potential for more sophisticated network interactions in optoelectronic neuromorphic systems.
