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Mode switching using optically induced long-period gratings: a theoretical analysis.

Gil M Fernandes, Ana M Rocha, Margarida Facão

    Optics Express
    |May 14, 2021
    PubMed
    Summary

    Optically induced long-period gratings (OLPGs) are a form of inter-modal Bragg-scattering four-wave mixing (BS-FWM). OLPGs offer broader bandwidths for all-optical mode switching in space-division multiplexing systems.

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    Area of Science:

    • Optical physics
    • Telecommunications engineering

    Background:

    • Inter-modal Bragg-scattering four-wave mixing (BS-FWM) and optically induced long-period gratings (OLPGs) are key for mode switching in space-division multiplexing (SDM).
    • Understanding the relationship between BS-FWM and OLPGs is crucial for optimizing optical transmission systems.

    Purpose of the Study:

    • To analyze OLPGs as a specific instance of BS-FWM.
    • To investigate energy transfer mechanisms driven by OLPGs.
    • To compare the performance of OLPGs and BS-FWM for all-optical mode switching.

    Main Methods:

    • Development of a vector model for inter-modal BS-FWM.
    • Tailoring the BS-FWM model to study OLPG-induced energy transfer.
    • Comparative analysis of bandwidths and switching capabilities.

    Main Results:

    • Optically induced long-period gratings (OLPGs) are identified as a specific case of inter-modal Bragg-scattering four-wave mixing (BS-FWM).
    • OLPGs exhibit a larger operational bandwidth compared to BS-FWM.
    • OLPG-based mode switching demonstrates tunability across two spectral windows, controllable via pump beam parameters.

    Conclusions:

    • OLPGs represent a specialized form of BS-FWM with enhanced bandwidth.
    • OLPGs provide a flexible and tunable mechanism for all-optical mode switching in SDM transmission systems.
    • Precise control over pump beam characteristics enables optimization of OLPG-based mode switching windows.