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    Area of Science:

    • Nonlinear optics
    • Semiconductor lasers
    • Optical frequency combs

    Background:

    • Vertical-cavity surface-emitting lasers (VCSELs) are key components in optical systems.
    • Optical frequency combs offer precise frequency references.
    • Controlling VCSEL polarization dynamics is crucial for advanced applications.

    Purpose of the Study:

    • To experimentally investigate nonlinear polarization dynamics in VCSELs under optical frequency comb injection.
    • To demonstrate the generation of single and dual polarization frequency combs.
    • To explore the control of comb properties like spacing, bandwidth, and polarization.

    Main Methods:

    • Experimental setup involving a VCSEL subject to optical injection from a frequency comb.
    • Tuning the polarization of the injected comb relative to the VCSEL.
    • Varying injection parameters such as power and detuning frequency.

    Main Results:

    • Generation of single or dual polarization frequency combs by adjusting injection polarization.
    • Control over comb spacing and bandwidth, achieving combs over 60 GHz.
    • Increased output frequency lines up to 15 times the injected comb lines.
    • High carrier-to-noise ratio (CNR) up to 60 dB achieved.

    Conclusions:

    • The developed technique allows independent control of comb spacing, bandwidth, CNR, and polarization.
    • This method offers a versatile platform for generating tailored optical frequency combs.
    • Potential applications include high-resolution spectroscopy and polarization division multiplexing in optical communications.