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Selective mode multiplexer based on phase plates and Mach-Zehnder interferometer with image inversion function.

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    This summary is machine-generated.

    We developed a new mode multiplexer using phase plates and Mach-Zehnder interferometers. This device efficiently couples higher-order optical modes, enabling higher data transmission rates in few-mode fibers.

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    Area of Science:

    • Optical Engineering
    • Photonics
    • Telecommunications

    Background:

    • Few-mode fibers (FMF) support multiple optical modes, offering potential for increased data capacity.
    • Efficiently multiplexing and demultiplexing these modes is crucial for realizing advanced optical communication systems.

    Purpose of the Study:

    • To propose and demonstrate a novel mode multiplexer utilizing phase plates and Mach-Zehnder interferometers (MZI) with image inversion.
    • To evaluate the performance of the proposed mode converter and multiplexer for coupling various linear-polarized (LP) modes.

    Main Methods:

    • Numerical and experimental evaluation of a phase plate-based mode converter.
    • Development and characterization of mode multiplexers employing phase plates and MZIs with image inversion.
    • Bit-error rate (BER) measurement of single-polarization mode-multiplexed quadrature-phase shift keying (QPSK) signals.

    Main Results:

    • The phase plate mode converter is effective for up to five LP modes (LP01, LP11ab, LP21ab) in FMF, with unavoidable crosstalk for modes beyond LP02.
    • Insertion loss is reduced to approximately 3 dB for mode multiplexing of LP(11a) and LP(11b) modes.
    • Successful BER performance measurement for mode-multiplexed QPSK signals using a fabricated multiplexer for LP(31a) and LP(31b) modes.

    Conclusions:

    • The proposed MZI with image inversion offers an effective method for mode coupling without fundamental loss.
    • The developed mode multiplexer is suitable for higher-order mode coupling in few-mode fiber communication systems.
    • This technology shows promise for enhancing optical communication capacity through mode division multiplexing.