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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Spectrally efficient polarization multiplexed direct-detection OFDM system without frequency gap.

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    This study presents a spectrally efficient direct-detection orthogonal frequency-division multiplexing (DD-OFDM) system. The novel gap-less design, combined with advanced detection, enhances data transmission without polarization control.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Information Theory

    Background:

    • Traditional direct-detection orthogonal frequency-division multiplexing (DD-OFDM) systems utilize a frequency gap to prevent subcarrier-to-subcarrier beating interference (SSBI).
    • This frequency gap, however, limits spectral efficiency.
    • Achieving higher spectral efficiency in DD-OFDM systems without polarization control remains a challenge.

    Purpose of the Study:

    • To demonstrate a spectrally efficient gap-less DD-OFDM system.
    • To propose and validate an iterative multiple-input multiple-output (MIMO) detection scheme for mitigating polarization-dependent interference.
    • To improve the signal-to-noise ratio (SNR) by eliminating both inter-carrier interference (ICI) and SSBI.

    Main Methods:

    • Experimental implementation of a gap-less DD-OFDM system incorporating polarization-division multiplexing.
    • Development of an iterative MIMO detection algorithm to address mixed linear ICI and nonlinear SSBI.
    • Square-law direct detection without the need for dynamic polarization control.

    Main Results:

    • The proposed iterative MIMO detection scheme effectively removes polarization-dependent ICI and nonlinear SSBI.
    • An improvement of approximately 7 dB in SNR is achieved compared to schemes that only mitigate ICI.
    • Successful transmission of a 39.5-Gbps polarization-multiplexed OFDM signal over 100 km using 7-GHz bandwidth.

    Conclusions:

    • The gap-less DD-OFDM system offers enhanced spectral efficiency.
    • The iterative MIMO detection scheme is crucial for mitigating complex interference in polarization-dependent systems.
    • This approach enables high-speed optical data transmission without requiring polarization control.