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Optical switching and logic gates with vertical cavity surface-emitting lasers
Optics Letters
|October 27, 2009
Summary
This study explores bistability in vertical cavity lasers, demonstrating their potential for optical NOR logic gates. Researchers numerically analyzed mode switching for advanced photonic applications.
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Vertical cavity surface-emitting lasers (VCSELs) are crucial components in optical systems.
- Understanding mode behavior and bistability is key for advanced laser applications.
Purpose of the Study:
- To investigate bistability in a cylindrical VCSEL with a square active region operating in specific Gauss-Hermite modes.
- To explore optical switching between modes and its application in logic gates.
Main Methods:
- Utilized a rate-equation model incorporating the linewidth enhancement factor.
- Performed numerical simulations to study mode switching dynamics.
Main Results:
- Identified two bistability domains within the parameter space.
- Demonstrated optical switching between TEM(10) and TEM(01) modes using a control beam.
- Showcased the potential for implementing a NOR logic gate.
Conclusions:
- The studied VCSEL exhibits complex mode behavior and bistability.
- Optical switching in these lasers can be controlled, enabling logic gate functionality.
- This research contributes to the development of optical computing and signal processing devices.
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