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Low-threshold all-optical nonlinear activation function based on injection locking in distributed feedback laser

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    Researchers developed a low-threshold, high-speed all-optical nonlinear activation unit using distributed feedback laser diodes (DFB-LDs). This unit shows promise for high-throughput optical neural networks (ONNs) by efficiently solving complex equations.

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    Area of Science:

    • Photonics
    • Optical Computing
    • Nonlinear Optics

    Background:

    • Optical neural networks (ONNs) require efficient nonlinear activation units for complex computations.
    • Existing optical activation methods often face challenges with low thresholds and high speeds.
    • Distributed feedback laser diodes (DFB-LDs) offer unique nonlinear carrier dynamics.

    Purpose of the Study:

    • To experimentally demonstrate an all-optical nonlinear activation unit.
    • To achieve a low-threshold and high-speed nonlinear activation function.
    • To verify the unit's performance in a neural network application.

    Main Methods:

    • Utilizing the injection-locking effect in distributed feedback laser diodes (DFB-LDs).
    • Optimizing operating conditions to leverage nonlinear carrier dynamics.
    • Applying the developed unit to solve a second-order ordinary differential equation.

    Main Results:

    • Demonstrated a low-threshold nonlinear activation function at -15.86 dBm.
    • Achieved high-speed operation at 1 GHz.
    • Obtained a low fitting error of 0.0034 in the differential equation task.

    Conclusions:

    • The developed DFB-LD based unit offers a competitive, low-threshold, high-speed optical nonlinear activation solution.
    • The unit's performance validates its feasibility for optical neural network applications.
    • The low-threshold design is well-suited for developing high-throughput ONNs with large fan-out capabilities.