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Switching of BJT

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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Bistability and all-optical switching in semiconductor ring lasers.

Toni Pérez, Alessandro Scirè, Guy Van der Sande

    Optics Express
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    This study investigates semiconductor ring lasers, focusing on how optical pulses switch between operating modes. Researchers determined the optimal pulse energy and response time for this bistable system, crucial for data storage applications.

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    Area of Science:

    • Optoelectronics
    • Nonlinear Dynamics
    • Quantum Optics

    Background:

    • Semiconductor ring lasers exhibit complex dynamics due to competing clockwise and counter-clockwise modes.
    • A bistable regime with coexisting quasi-unidirectional modes occurs at high pumping levels.
    • This bistability, driven by cross-gain saturation, is a candidate for optical data storage.

    Purpose of the Study:

    • To analyze the response time of semiconductor ring lasers when switching between counter-propagating modes using optical pulses.
    • To identify the optimal optical pulse energy required to induce mode switching.

    Main Methods:

    • Investigated the switching dynamics of semiconductor ring lasers.
    • Performed experiments involving optical pulse injection.
    • Analyzed system response and determined optimal pulse parameters.

    Main Results:

    • Characterized the response time for switching between unidirectional modes.
    • Identified the optimal pulse energy for inducing mode switching in the bistable regime.
    • Demonstrated the potential for controlled mode switching in semiconductor ring lasers.

    Conclusions:

    • Optical pulse injection provides a viable method for controlling mode switching in bistable semiconductor ring lasers.
    • Understanding response time and optimal pulse energy is key for developing optical data storage devices based on these lasers.