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Feedback effects in optical communication systems: characteristic curve for single-mode InGaAsP lasers.

F Brivio, C Reverdito, G Sacchi

    Applied Optics
    |August 25, 2010
    PubMed
    Summary

    Optical feedback in InGaAsP injection lasers unexpectedly reduces quantum efficiency. A microscopic model explains this by considering how feedback affects carrier lifetime, matching experimental data for laser diodes.

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    Area of Science:

    • Semiconductor physics
    • Optoelectronics
    • Laser technology

    Background:

    • InGaAsP injection lasers are crucial for optical communications.
    • Optical feedback can significantly alter laser diode performance.
    • Previous models did not fully capture feedback effects on quantum efficiency.

    Purpose of the Study:

    • Investigate the unexpected decrease in differential quantum efficiency in InGaAsP lasers under optical feedback.
    • Develop a microscopic model to explain the laser diode's response to optical feedback.
    • Analyze the nonlinear dependence of interband carrier lifetime on optical feedback levels.

    Main Methods:

    • Experimental analysis of InGaAsP injection lasers with optical feedback.
    • Development of a microscopic model based on coupled equations.

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  • Inclusion of microscopic parameters characterizing material and device properties.
  • Accounting for the nonlinear dependence of interband carrier lifetime.

    • Main Results:

    • Observed an unexpected decrease in differential quantum efficiency with increasing injected current under optical feedback.
    • The microscopic model accurately predicted threshold current and differential quantum efficiency.
    • The model demonstrated good agreement with experimental data across varying feedback ratios.

    Conclusions:

    • The microscopic model provides a valid explanation for the observed behavior of InGaAsP lasers under optical feedback.
    • Nonlinear carrier lifetime dependence on feedback is critical for understanding laser efficiency.
    • This work offers insights into optimizing laser diode performance in feedback-sensitive applications.