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Broadband mode division multiplexer using all-fiber mode selective couplers.

Kyung Jun Park, Kwang Yong Song, Young Kie Kim

    Optics Express
    |February 25, 2016
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    We developed a broadband all-fiber mode division multiplexer using cascaded couplers. This device efficiently multiplexes 4 spatial modes across the S, C, and L bands, enabling stable optical communication.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Materials Science

    Background:

    • Mode division multiplexing (MDM) is crucial for increasing optical fiber communication capacity.
    • Existing MDM devices often suffer from narrow bandwidth and complex fabrication.
    • All-fiber devices offer advantages in mechanical stability and integration.

    Purpose of the Study:

    • To develop a broadband all-fiber mode division multiplexer (MDM).
    • To achieve efficient multiplexing of multiple spatial modes over a wide wavelength range.
    • To demonstrate the feasibility of cascaded mode selective couplers for MDM.

    Main Methods:

    • Fabrication of mode selective couplers by precisely matching effective refractive indices between few-mode fiber and single-mode fiber.
    • Cascading these couplers to create the MDM device.
    • Characterization of coupling efficiency, mode extinction ratio, and far-field patterns across the S, C, and L bands.

    Main Results:

    • Achieved a significantly broadened bandwidth potentially spanning S, C, and L bands.
    • Demonstrated high coupling efficiency (>55% worst-case) for 4 spatial modes from 1515-1590 nm.
    • The all-fiber construction ensures excellent mechanical stability.

    Conclusions:

    • The developed all-fiber MDM based on cascaded mode selective couplers offers broadband operation.
    • This technology provides a stable and efficient solution for increasing optical communication capacity.
    • The device performance validates the design approach for future integrated photonic systems.