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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Polar coded symbol division multiplexing scheme for bandwidth efficient short-reach optical interconnection.

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    A new symbol division multiplexing (SDM) scheme using polar coded pulse amplitude modulation (PAM) improves bandwidth efficiency in optical interconnections. This method enhances power sensitivity by 2.5 dB, enabling higher data rates over limited bandwidth.

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    Area of Science:

    • Optical Communications
    • Information Theory

    Background:

    • Bandwidth limitations impair optical interconnection performance.
    • Pulse Amplitude Modulation (PAM) is a common modulation technique.

    Purpose of the Study:

    • To propose and demonstrate a joint polar coded Pulse Amplitude Modulation (PAM) scheme with Symbol Division Multiplexing (SDM) to overcome bandwidth limitations.
    • To enhance information capacity per symbol and improve bandwidth efficiency.

    Main Methods:

    • Developed a novel many-to-one mapping scheme using polar codes within SDM-PAM4.
    • Designed a systematic polar encoder for simultaneous Symbol Demultiplexing (De-SDM) and polar decoding without iterative calculations.
    • Experimentally demonstrated the scheme in an intensity modulation and directly detected optical interconnection over 2-km single-mode fiber.

    Main Results:

    • The proposed SDM-PAM4 scheme achieved a 2.5 dB improvement in receiver power sensitivity compared to conventional PAM4.
    • Maintained the same data rate under constrained system bandwidth.
    • Demonstrated optimal system performance in simultaneous De-SDM and polar decoding.

    Conclusions:

    • The polar coded SDM-PAM4 scheme effectively mitigates impairments caused by system bandwidth limitations.
    • The scheme offers enhanced bandwidth efficiency and reduced symbol rate requirements.
    • Highly promising for bandwidth-limited optical interconnections due to short code length and flexible rates.