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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Efficient and reliable digital sub-band multiplexed nonlinear frequency division multiplexing system.

Peiyun Ge, Lixia Xi, Jiayun Deng

    Optics Express
    |November 14, 2024
    PubMed
    Summary
    This summary is machine-generated.

    A new digital sub-band multiplexed (DSBM) Nonlinear Frequency Division Multiplexing (NFDM) system improves spectral efficiency by reducing guard intervals. This novel approach enhances information rates without compromising reliability in optical transmissions.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Nonlinear Frequency Division Multiplexing (NFDM) offers an advantage by mitigating fiber nonlinear effects.
    • However, NFDM systems face limitations in spectral efficiency due to guard intervals (GI) required for chromatic dispersion (CD) compensation.

    Purpose of the Study:

    • To introduce a novel Digital Sub-band Multiplexed (DSBM) NFDM system to enhance spectral efficiency.
    • To investigate the suitability of different subcarrier shaping techniques within the DSBM-NFDM framework.

    Main Methods:

    • Development and numerical simulation of a DSBM-NFDM system.
    • Comparison of root raised cosine (RRC) shaped subcarriers against orthogonal frequency division multiplexing (OFDM) shaped subcarriers.
    • Evaluation of system performance in terms of effective information rate (EIR) and net information rate.

    Main Results:

    • The proposed DSBM-NFDM system significantly reduces the minimal required guard interval.
    • Root raised cosine (RRC) shaped subcarriers demonstrated superior performance compared to OFDM in the DSBM-NFDM system.
    • A 129.7% improvement in effective information rate (EIR) was achieved compared to single channel (SC) NFDM.
    • A net information rate of 531.0 Gbps over 960 km with a spectral efficiency (SE) of 3.86 bit/s/Hz was demonstrated, below the HD-FEC threshold.

    Conclusions:

    • The DSBM technique is effectively introduced into NFDM systems for the first time.
    • The DSBM-NFDM system offers a substantial increase in information rate and spectral efficiency.
    • This work presents a novel subcarrier shaping scheme for NFDM with potential for practical implementation.