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12-mode OFDM transmission using reduced-complexity maximum likelihood detection.

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    We achieved high-capacity optical data transmission using multiplexing techniques over few-mode fiber. A novel detector improved performance despite signal impairments.

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    Area of Science:

    • Optical communications
    • Fiber optics engineering
    • Signal processing

    Background:

    • Few-mode fiber (FMF) enables higher data rates by supporting multiple spatial and polarization modes.
    • Mode-dependent loss (MDL) is a significant challenge in FMF systems, causing signal degradation.
    • Advanced modulation formats like Quadrature Amplitude Modulation (QAM) and Phase-Shift Keying (QPSK) are crucial for increasing spectral efficiency.

    Purpose of the Study:

    • To demonstrate high-capacity data transmission over FMF using mode-division multiplexing (MDM).
    • To evaluate the effectiveness of a low-complexity maximum likelihood (ML) detector in mitigating impairments in FMF systems.
    • To achieve high spectral efficiency using advanced modulation formats combined with MDM-OFDM.

    Main Methods:

    • Implementing mode-division multiplexing (MDM) with Orthogonal Frequency Division Multiplexing (OFDM).
    • Utilizing Quadrature Phase-Shift Keying (QPSK) and 8-level Quadrature Amplitude Modulation (8QAM) for data encoding.
    • Employing a low-complexity maximum likelihood (ML) detector to compensate for mode-dependent loss (MDL).
    • Transmitting data over 74 km of few-mode fiber supporting 12 spatial and polarization modes.

    Main Results:

    • Successful transmission of 163 Gb/s using MDM-QPSK-OFDM.
    • Successful transmission of 245 Gb/s using MDM-8QAM-OFDM.
    • Demonstrated performance enhancement in the presence of mode-dependent loss using the ML detector.

    Conclusions:

    • High-capacity optical transmission is feasible over few-mode fiber using MDM-OFDM.
    • The low-complexity ML detector effectively mitigates mode-dependent loss, improving system performance.
    • Advanced modulation formats combined with MDM offer a promising path towards future high-bandwidth optical networks.