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Generalized Rayleigh quotient optimization method for inter-channel nonlinearity compensation in coherent optical

Tianxiang Lan, Chuanchuan Yang, Xiansong Fang

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    |February 1, 2024
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    Summary

    We introduce a new method for compensating inter-channel nonlinearity in wavelength division multiplexing (WDM) systems. The generalized Rayleigh quotient optimization (GRQO) method improves signal quality over long-distance fiber optic transmissions.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Nonlinear Optics

    Background:

    • Inter-channel nonlinearity poses a significant challenge in wavelength division multiplexing (WDM) systems, limiting transmission capacity and reach.
    • Effective compensation is vital for enhancing the performance of modern optical networks.

    Purpose of the Study:

    • To propose and evaluate a novel method for inter-channel nonlinearity compensation in WDM systems.
    • To demonstrate the effectiveness of the generalized Rayleigh quotient optimization (GRQO) method in improving signal quality.

    Main Methods:

    • Development of the generalized Rayleigh quotient optimization (GRQO) method with two distinct operational modes.
    • Experimental validation in an 8 × 64 GBaud 16-ary quadrature amplitude modulation (16-QAM) system.
    • Comparison against the nonlinear polarization crosstalk canceller (NPCC) over 1600 km of standard single-mode fiber (SSMF).

    Main Results:

    • The GRQO method achieved a 0.40 dB Q² factor improvement compared to the NPCC.
    • The proposed method demonstrated a moderately low computational complexity of approximately 2000 real multiplications per bit (RMb).
    • Successful compensation of inter-channel nonlinearities was observed in a high-capacity WDM system.

    Conclusions:

    • The GRQO method offers a promising solution for inter-channel nonlinearity compensation in WDM systems.
    • GRQO provides a favorable trade-off between performance improvement and computational complexity.
    • This advancement contributes to enhanced transmission capacity and distance in optical communication systems.