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The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
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Folded orthogonal frequency division multiplexing.

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    We introduce folded Orthogonal Frequency Division Multiplexing (OFDM) for efficient optical networking. This novel scheme enables precise frequency control, achieving high-performance data transmission over long distances.

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    Area of Science:

    • Optical communication systems
    • Signal processing in telecommunications

    Background:

    • Traditional Orthogonal Frequency Division Multiplexing (OFDM) faces limitations in spectral efficiency.
    • Wavelength Division Multiplexing (WDM) offers precise frequency control but can be spectrally inefficient.

    Purpose of the Study:

    • To propose and demonstrate a novel sub-carrier multiplexing scheme called 'folded' OFDM.
    • To achieve the precise frequency definition of Nyquist WDM using OFDM.

    Main Methods:

    • Utilized orthogonal, periodic-sinc-shaped sub-carrier spectra for folded OFDM.
    • Implemented and tested 10 GHz sub-bands and 40 GHz bands in an add/drop multiplexing scenario.

    Main Results:

    • Demonstrated a 0.5-dB implementation penalty for 10 GHz sub-bands.
    • Achieved successful data transmission over 4160 km.
    • Showcased folded OFDM's advantages over conventional OFDM in bandwidth-limited systems on a 50 GHz WDM grid.

    Conclusions:

    • Folded OFDM offers a spectrally efficient alternative for optical communication.
    • The scheme provides precise frequency control comparable to Nyquist WDM.
    • Folded OFDM is particularly beneficial for bandwidth-limited optical systems.