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Experimental demonstration of optical waveform transmission with multiple-eigenvalue 16-APSK modulation.

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    This study demonstrates a novel discrete spectrum-modulated nonlinear frequency-division multiplexing (DS-NFDM) system using multiple eigenvalues and 16-amplitude phase shift keying (16-APSK). The system achieved a record number of multiplexed eigenvalues and data rate for enhanced optical communication.

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    Area of Science:

    • Optical Communications
    • Photonics
    • Signal Processing

    Background:

    • Nonlinear frequency-division multiplexing (NFDM) offers high spectral efficiency.
    • Discrete spectrum modulation (DSM) enhances NFDM performance.
    • Multi-eigenvalue multiplexing is a promising technique for increasing data capacity.

    Purpose of the Study:

    • To experimentally demonstrate a multi-eigenvalue multiplexing-based DS-NFDM system.
    • To investigate the performance of higher-order modulation formats within this system.
    • To achieve a record number of multiplexed eigenvalues and data rate.

    Main Methods:

    • Designing eigenvalue set coefficients and 16-amplitude phase shift keying (16-APSK) constellation points.
    • Implementing 14-, 30-, and 46-eigenvalue multiplexed DS-NFDM signals.
    • Testing signal transmission over nonzero dispersion-shifted fiber (NZDSF).

    Main Results:

    • Successfully implemented DS-NFDM signals with up to 46 eigenvalues.
    • 46-eigenvalue signals transmitted 50 km, and 30-eigenvalue signals transmitted 400 km.
    • Achieved transmission under a soft-decision forward error correction (SD-FEC) threshold of 2.4E-2.

    Conclusions:

    • The multi-eigenvalue multiplexing DS-NFDM system with 16-APSK is experimentally validated.
    • This work sets a new record for multiplexed eigenvalue number and data rate in such systems.
    • The results highlight the potential of this technology for future high-capacity optical networks.