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Estimating divergently routed nonlinearly interfering channel powers using cross phase modulation.

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    Summary
    This summary is machine-generated.

    This study introduces a novel method for autonomous optical channel configuration in legacy and future networks. It uses a probe channel to accurately infer neighboring channel power, reducing network upgrade costs.

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    Area of Science:

    • Optical networking and telecommunications.
    • Signal processing and channel characterization.

    Background:

    • Coherent transceivers require significant investment for deployment in legacy networks.
    • Future optical networks need autonomous channel configuration due to flexible grids and software-defined components like Reconfigurable Optical Add Drop Multiplexers (ROADM).

    Purpose of the Study:

    • To propose and validate a method for autonomous optical channel (re-)configuration.
    • To enable efficient characterization of optical channels in legacy and future networks, considering interfering channels.

    Main Methods:

    • Utilized a 40Gbit/s polarization multiplexed quadrature phase shift keying (PM-QPSK) probe channel from a commercial line card.
    • Inferred neighboring channel power by analyzing the bit error rate (BER) of the probe channel, which is affected by cross-phase modulation (XPM).
    • Conducted experiments in a 4-node network with 2 ROADMs, using up to 6 aggressor On-Off Keying (OOK) channels.

    Main Results:

    • Successfully deduced neighboring channel power down to -2 dBm in a multi-node network.
    • Achieved improved power deduction down to -3.5 dBm by measuring at an offset to the International Telecommunication Union (ITU) grid.
    • Revealed inequality in neighbor channel powers through the measurement offset.

    Conclusions:

    • The proposed method enables autonomous optical channel characterization, reducing the need for manual configuration and investment in legacy systems.
    • This technique is crucial for future flexible grid networks and supports software-defined networking components.
    • Accurate inference of neighboring channel power is achievable even with interfering channels present.