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Reservoir computing based on an external-cavity semiconductor laser with optical feedback modulation.

Kazutaka Kanno, Afeeqah Amalina Haya, Atsushi Uchida

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    |October 15, 2022
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    Summary
    This summary is machine-generated.

    Reservoir computing using phase modulation of optical feedback in a semiconductor laser shows superior performance for chaotic time-series prediction compared to intensity modulation. This method enables high-dimensional mapping for improved prediction accuracy.

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    Area of Science:

    • Nonlinear Dynamics
    • Optoelectronics
    • Computational Science

    Background:

    • Reservoir computing (RC) offers a powerful framework for processing complex time-series data.
    • Semiconductor lasers with optical feedback exhibit rich nonlinear dynamics suitable for RC applications.
    • Modulation of optical feedback is a key technique for inputting signals into laser-based RC systems.

    Purpose of the Study:

    • To investigate and compare the performance of reservoir computing schemes using intensity modulation versus phase modulation of optical feedback in a single semiconductor laser.
    • To analyze the parameter dependence of the reservoir computing performance, particularly the impact of injection currents.
    • To elucidate the physical mechanisms behind the observed performance differences, focusing on phase modulation's advantages.

    Main Methods:

    • Numerical and experimental investigation of a semiconductor laser with modulated optical feedback.
    • Implementation of a chaotic time-series prediction task to evaluate reservoir computing performance.
    • Analysis of external cavity modes and phase space dynamics to understand the physical origins of performance variations.

    Main Results:

    • Phase modulation of optical feedback significantly outperforms intensity modulation for chaotic time-series prediction tasks in the reservoir computing scheme.
    • Reservoir computing performance, measured by prediction error, improves with larger injection currents, a trend distinct from optical injection input systems.
    • Phase modulation facilitates high-dimensional mapping from the input signal to the semiconductor laser's output trajectory, explaining its superior performance.

    Conclusions:

    • Phase modulation of optical feedback provides a more effective method for implementing semiconductor laser-based reservoir computing compared to intensity modulation.
    • The study highlights the critical role of modulation scheme choice and parameter tuning (e.g., injection current) in optimizing reservoir computing performance.
    • The findings suggest that phase modulation enables richer dynamics and higher-dimensional state mapping, crucial for complex signal processing tasks.