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Power domain superimposed modulation method based on dimensional level transformation and 5D constellation shaping.

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    This study introduces a novel power domain superposition modulation method using five-dimensional (5D) constellation shaping. This technique enhances optical communication systems, offering improved receiver sensitivity and signal gain.

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    Area of Science:

    • Optical communication systems
    • Digital signal processing
    • Modulation techniques

    Background:

    • Traditional modulation methods in Intensity Modulation/Direct Detection (IM/DD) systems face limitations in spectral efficiency and receiver sensitivity.
    • Advanced modulation schemes are crucial for meeting the increasing data rate demands in optical networks.

    Purpose of the Study:

    • To propose and experimentally validate a novel power domain superposition modulation method.
    • To enhance constellation shaping using dimensional level transformation and five dimensions (5D).
    • To improve receiver sensitivity and signal gain in IM/DD systems.

    Main Methods:

    • Dimensional level transformation and five-dimensional (5D) constellation shaping using a stacked regular triangular pyramid structure.
    • Signal superposition in the power domain achieved through dimensional transformation for data modulation.
    • Experimental verification in a 2 km seven-core fiber IM/DD system.

    Main Results:

    • The proposed 5D constellation shaping method geometrically shapes the constellation.
    • Signal superposition in the power domain is effectively implemented via dimensional transformation.
    • A 0.7 dB gain at high received optical power and a 0.4 dB receiver sensitivity gain at a Bit Error Rate (BER) of 3.8 × 10⁻³ were achieved compared to 2D-32QAM.

    Conclusions:

    • The power domain superposition modulation method based on 5D constellation shaping offers significant performance improvements.
    • This technique enhances receiver sensitivity and signal gain in IM/DD optical systems.
    • The geometric shaping of constellations through dimensional transformation is a viable approach for advanced optical modulation.