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Bistable fiber-optic Michelson interferometer that uses wavelength control.

N Fürstenau

    Optics Letters
    |September 29, 2009
    PubMed
    Summary

    Feedback control in an unbalanced Michelson interferometer creates bistability and self-oscillations in semiconductor lasers. The study identifies critical input intensity for these phenomena using time constants and feedback delay. This research advances laser dynamics understanding.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Dynamics
    • Semiconductor Laser Physics

    Background:

    • Michelson interferometers are crucial optical devices.
    • Semiconductor lasers exhibit complex dynamics under external feedback.
    • Bistability and self-oscillations are key nonlinear phenomena in laser systems.

    Purpose of the Study:

    • To investigate the feedback-induced bistability and self-oscillations in an unbalanced Michelson interferometer system.
    • To determine the critical input intensity for the onset of self-oscillations.
    • To analyze the influence of wavelength-induced phase modulation on laser output.

    Main Methods:

    • Utilizing an unbalanced Michelson interferometer with feedback to a semiconductor laser's current supply.
    • Performing a linear stability analysis on the system's differential equation.

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  • Experimentally modulating input power with an integrated-optics intensity modulator.

    • Main Results:

    • Bistability observed under input intensity variation due to wavelength-induced phase modulation.
    • Linear stability analysis yields the ratio of system time constant (tau) to feedback delay time (T) for critical intensity determination.
    • Experimental input-output characteristics confirm bistability and self-oscillations.

    Conclusions:

    • Feedback control in unbalanced Michelson interferometers can induce bistability and self-oscillations in semiconductor lasers.
    • The ratio of time constants is critical for predicting the onset of self-oscillations.
    • Experimental validation confirms the theoretical predictions, offering insights into laser dynamics control.