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Enabling cost-effective high-performance vibration sensing in digital subcarrier multiplexing systems.

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    This study integrates digital linear frequency modulated sensing signals into digital subcarrier multiplexing (DSCM) signals for simultaneous communication and sensing. The cost-effective method supports high-speed data transmission and sensitive distributed acoustic sensing.

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    Area of Science:

    • Optical communication networks
    • Integrated sensing and communication systems

    Background:

    • Digital Subcarrier Multiplexing (DSCM) offers spectral flexibility for short-reach communication.
    • Coherent architectures are compatible with DSCM, enabling cost-sensitive integrated sensing and communication.

    Purpose of the Study:

    • To propose a spectrally integrated scheme for simultaneous sensing and communication using a shared transmitter.
    • To demonstrate the feasibility of integrating digital linear frequency modulated sensing signals into DSCM signals.

    Main Methods:

    • Spectrally integrating digital linear frequency modulated sensing signals into DSCM signals.
    • Utilizing a shared transmitter for both communication and sensing functionalities.
    • Demonstrating high-speed data transmission with dual-polarization quadrature phase-shift keying (DP-QPSK) and dual-polarization 16-ary quadrature amplitude modulation (DP-16QAM).

    Main Results:

    • Achieved 100-Gb/s DP-QPSK and 200-Gb/s DP-16QAM transmission.
    • Demonstrated distributed acoustic sensing sensitivity of 69 µε/Hz and 88 µε/Hz.
    • Maintained a spatial resolution of 4 meters for sensing.

    Conclusions:

    • The proposed cost-effective scheme enables simultaneous communication and sensing.
    • The integration of sensing signals into DSCM is effective for advanced optical networks.
    • This approach is suitable for future integrated sensing and communication applications.