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Nonlinear frequency conversion in a birefringent microstructured fiber tuned by externally applied hydrostatic

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    We explored using microstructured fibers for novel nonlinear fiber-optic sensors. Vector nonlinear processes, sensitive to fiber birefringence changes, offer superior pressure-sensing capabilities over scalar processes.

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    Area of Science:

    • Nonlinear optics
    • Fiber optics
    • Sensor technology

    Background:

    • Microstructured fibers offer tunable optical properties.
    • Nonlinear optical processes are key to advanced sensing.
    • Modulation instability is a crucial nonlinear phenomenon.

    Purpose of the Study:

    • To investigate vector frequency conversion in microstructured fibers for sensing.
    • To explore pressure-induced tuning of nonlinear optical properties.
    • To compare vector and scalar nonlinear processes for pressure-sensing applications.

    Main Methods:

    • Experimental investigation of externally tuned microstructured fibers.
    • Numerical simulations of nonlinear optical processes.
    • Analysis of modulation instability gain bands under pressure.

    Main Results:

    • Pressure-induced changes in fiber birefringence can tune nonlinear processes.
    • Vector nonlinear processes show enhanced sensitivity to group velocity difference variations.
    • Polarization-dependent vector processes are advantageous for pressure sensing.

    Conclusions:

    • Microstructured fibers are suitable for novel nonlinear fiber-optic sensors.
    • Vector nonlinear processes provide a superior mechanism for pressure sensing compared to scalar processes.
    • The study confirms the potential of exploiting fiber birefringence for high-performance sensing.