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Semiconductor laser dynamics subject to strong optical feedback.

M W Pan, B P Shi, G R Gray

    Optics Letters
    |February 1, 1997
    PubMed
    Summary
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    Sporadic power discontinuities, termed low-frequency fluctuations (LFFs), occur in semiconductor lasers with optical feedback. These LFFs appear across feedback regimes, not just near threshold, and change from dropouts to jump-ups above threshold.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Device Physics
    • Nonlinear Dynamics

    Background:

    • Semiconductor lasers are crucial optoelectronic devices.
    • Optical feedback can significantly alter laser behavior.
    • Previous studies suggested low-frequency fluctuations (LFFs) primarily occur near the solitary-laser threshold.

    Purpose of the Study:

    • To experimentally investigate the behavior of semiconductor lasers under moderate to strong optical feedback.
    • To characterize the occurrence and nature of power discontinuities (LFFs) across different feedback regimes.
    • To compare experimental findings with theoretical modeling.

    Main Methods:

    • Experimental setup involving a semiconductor laser subjected to controlled optical feedback.
    • Systematic variation of feedback strength and coupling conditions.

    Related Experiment Videos

  • Analysis of laser output power dynamics and spectral characteristics.
  • Development and application of theoretical models for comparison.

    • Main Results:

    • Sporadic power discontinuities (LFFs) were observed across the boundary of feedback regimes IV and V.
    • LFFs were found to occur broadly, not exclusively near the solitary-laser threshold.
    • The manifestation of LFFs changed with operating conditions: appearing as power dropouts near threshold and power jump-ups well above threshold.

    Conclusions:

    • The occurrence of LFFs in semiconductor lasers with optical feedback is more widespread than previously assumed.
    • The observed power discontinuities are dependent on feedback regime and proximity to the solitary-laser threshold.
    • Theoretical modeling provides a reasonable explanation for the experimental observations, supporting the understanding of laser dynamics under optical feedback.