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Wideband and high-dimensional chaos generation using optically pumped spin-VCSELs
Optics Express
|February 14, 2023
Summary
We demonstrate wideband, high-dimensional chaos generation using optically pumped spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs). This research offers a pathway for advanced secure communication systems needing complex chaotic signals.
Area of Science:
- Optoelectronics
- Nonlinear Dynamics
- Laser Physics
Background:
- Optically pumped spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs) offer unique polarization dynamics.
- Generating wideband and high-dimensional chaos is crucial for secure communication and complex signal processing.
Purpose of the Study:
- To propose and numerically demonstrate wideband and high-dimensional chaos signal generation using spin-VCSELs.
- To investigate chaotic characteristics under optical feedback and optical heterodyning schemes.
- To reveal methods for simultaneously enhancing chaos properties like bandwidth, spectral flatness, and dimensionality.
Main Methods:
- Numerical simulations of spin-VCSELs with optical feedback.
- Numerical simulations of optical heterodyning between two free-running spin-VCSELs.
- Systematic investigation of parameters influencing bandwidth, spectral flatness (SF), time delay signature (TDS), correlation dimension (CD), and permutation entropy (PE).
Main Results:
- Demonstration of chaos generation with effective bandwidth up to 30 GHz and above.
- Achieved low time delay signature (TDS) below 0.2.
- Obtained high spectral flatness (SF) of 0.75 and above, and high correlation dimension (CD) and permutation entropy (PE) indicating high complexity and dimensionality.
- Simultaneous enhancement of desired chaotic properties was achieved under both investigated schemes.
Conclusions:
- Spin-VCSELs with simple auxiliary configurations can generate wideband and high-dimensional chaos.
- The findings pave the way for potential applications requiring robust chaotic signals.
- This work highlights the potential of spin-VCSELs for advanced secure communication and signal processing applications.
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