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    Area of Science:

    • Quantum optics
    • Fiber optics
    • Nonlinear optics

    Background:

    • Intermodal four-wave mixing (FWM) in few-mode fibers (FMFs) is a promising technique for generating entangled photon pairs.
    • Previous research in single-mode fibers was limited by significant Raman scattering, which competes with FWM.
    • FMFs offer a potential solution by leveraging modal dispersion to mitigate Raman interference.

    Purpose of the Study:

    • To investigate the impact of pump spectral separation on intermodal FWM power and bandwidth in FMFs.
    • To explore the generation of photon pairs in various modes using dual-pump configurations in FMFs.
    • To analyze the trade-off between photon efficiency and bandwidth under varying spectral separations.

    Main Methods:

    • Utilizing a seeding technique to study intermodal FWM.
    • Employing two pumps in different modes within FMFs.
    • Experimentally testing two FMFs with distinct differential mode group delay (DMGD) values.

    Main Results:

    • The study demonstrates that increasing spectral separation between pumps and generated photons affects FWM power and bandwidth.
    • A larger spectral separation leads to decreased photon efficiency.
    • Conversely, a larger spectral separation results in an increased bandwidth for the generated photon pairs.

    Conclusions:

    • The spectral separation of pumps and generated photons is a critical parameter in optimizing intermodal FWM for photon-pair generation.
    • FMFs provide a viable platform for generating entangled photons with controllable properties.
    • The findings offer insights into designing FMF-based quantum light sources with tailored spectral characteristics.