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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Optical fiber resonators are crucial for various photonic applications.
    • Nested designs offer potential for enhanced spectral control.

    Purpose of the Study:

    • To present a novel nested optical fiber based multiple knot resonator design.
    • To investigate the relationship between knot diameter ratio and transmission spectrum.
    • To demonstrate simple tuning of the output spectrum.

    Main Methods:

    • Theoretical analysis using transfer matrix method.
    • Experimental validation of calculated results.
    • Fabrication of nested knot resonators with varying diameter ratios.

    Main Results:

    • The transmission spectrum is significantly influenced by the knots' diameter ratio.
    • Calculated results show good agreement with experimental data.
    • Free spectral range (FSR) is tunable by adjusting the small knot's diameter.

    Conclusions:

    • The nested optical fiber knot resonator offers a simple method for spectral control.
    • This photonic device is suitable for applications like optical interleavers, filters, and fiber lasers.
    • Variations in knot size and coupling coefficients effectively tune the output spectrum.