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    Semiconductor ring lasers (SRLs) show remarkable insensitivity to optical feedback, unlike Fabry-Perot lasers (FPLs). This enhanced tolerance makes SRLs promising for developing robust optical sources.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers

    Background:

    • Optical feedback can destabilize semiconductor lasers.
    • Fabry-Perot lasers (FPLs) are sensitive to optical feedback.

    Purpose of the Study:

    • To experimentally quantify and compare the feedback insensitivity of semiconductor ring lasers (SRLs) and FPLs.
    • To assess the potential of SRLs as feedback-insensitive optical sources.

    Main Methods:

    • Experimental measurement of optical feedback effects on SRLs and FPLs.
    • Analysis of optical spectra.
    • Optical linewidth measurements.
    • Self-mixing measurements.

    Main Results:

    • SRLs remain largely unaffected by optical feedback down to -23 dB.
    • SRLs exhibit 25-30 dB greater tolerance to optical feedback compared to FPLs.
    • The findings were consistent across linewidth and self-mixing measurements.

    Conclusions:

    • Semiconductor ring lasers possess significantly higher tolerance to optical feedback than Fabry-Perot lasers.
    • SRLs are highly suitable for applications requiring robust performance in the presence of optical feedback.