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    Optical injection locking (OIL) compensates for nonlinear phase noise in WDM systems. This technique improves signal quality and extends transmission reach by partially canceling cross-phase modulation (XPM).

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    Area of Science:

    • Optical communications
    • Nonlinear optics
    • Signal processing

    Background:

    • Inter-channel nonlinear phase noise, primarily cross-phase modulation (XPM), degrades performance in wavelength-division multiplexing (WDM) systems.
    • Homodyne receivers offer potential for noise cancellation but require a stable local oscillator.

    Purpose of the Study:

    • To propose and demonstrate optical injection locking (OIL) for compensating XPM-induced nonlinear phase noise.
    • To utilize OIL to generate a local oscillator from a residual carrier for a homodyne receiver.

    Main Methods:

    • Employing optical injection locking (OIL) to create a local oscillator from a residual carrier.
    • Designing the locking mechanism to be fast enough to track XPM phase distortion but slow enough to reject signal bands.
    • Implementing a homodyne receiver architecture that leverages the common phase between signals and the pilot.

    Main Results:

    • Achieved a 1-dB (0.7-dB) improvement in peak Q for QPSK (16-QAM) modulated OFDM subcarriers in a 7-channel WDM system.
    • Extended the transmission reach by 320 km.
    • Identified optimal performance at an injection ratio of -45 dB with a low injected power of -24.5 dBm.

    Conclusions:

    • Optical injection locking (OIL) effectively compensates for cross-phase modulation (XPM) in WDM systems.
    • The proposed OIL-based homodyne receiver enhances signal quality and transmission distance.
    • The method is efficient, requiring minimal injected power for optimal results.