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    Area of Science:

    • Optical communication networks
    • Integrated sensing and communication systems

    Background:

    • Optical networks are increasingly incorporating sensing capabilities.
    • Distributed Acoustic Sensing (DAS) is a key technology for network monitoring.
    • Continuous operation of DAS generates significant data processing demands.

    Purpose of the Study:

    • To propose a method for preliminary perturbation detection in bidirectional coherent optical networks.
    • To leverage forward polarization information as a trigger for DAS.
    • To reduce the operational burden and data processing workload of DAS.

    Main Methods:

    • Utilizing forward polarization information from a bidirectional coherent network.
    • Employing equalization taps to extract sensing data.
    • Simultaneous bidirectional 60-GBaud 16-QAM transmission and forward polarization sensing.
    • Triggering area-focused DAS based on preliminary sensing data.

    Main Results:

    • Demonstrated preliminary detection of network perturbations using forward polarization.
    • Enabled targeted activation of DAS, focusing on specific areas of interest.
    • Significantly reduced the data processing workload for DAS.
    • Achieved fine-grained and ultra-low complexity sensing through integrated functions.

    Conclusions:

    • The proposed method effectively integrates communication and sensing in optical networks.
    • Forward polarization sensing acts as an efficient trigger for DAS, enhancing practicality.
    • This approach paves the way for advanced network applications and improved surveillance.