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Adaptive digital back propagation exploiting adjoint-based optimization for fiber-optic communications.

Mahmoud M T Maghrabi, Mohamed H Bakr, Shiva Kumar

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    Summary
    This summary is machine-generated.

    This study introduces an adaptive digital back propagation (A-DBP) method for optical systems. It efficiently compensates for distortions without needing channel specifics, significantly reducing computational load.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Computational Photonics

    Background:

    • Optical fiber systems face linear and nonlinear distortions.
    • Accurate compensation typically requires detailed channel knowledge.
    • Existing digital back propagation (DBP) methods can be computationally intensive.

    Purpose of the Study:

    • To develop a novel adaptive digital back propagation (A-DBP) method.
    • To enable blind compensation of optical fiber transmission distortions.
    • To accelerate parameter estimation using an adjoint-based optimization (ABO) technique.

    Main Methods:

    • Proposed an adaptive digital back propagation (A-DBP) algorithm.
    • Introduced an adjoint-based optimization (ABO) technique for fast parameter estimation.
    • Utilized sequential quadratic programming (SQP) with adjoint sensitivity analysis (ASA).

    Main Results:

    • A-DBP blindly compensates for distortions without launch power or channel parameters.
    • ABO significantly accelerates A-DBP training compared to finite-difference methods.
    • Demonstrated effective distortion mitigation in 4- and 20-span systems.
    • Achieved high compensation performance with reduced computational complexity using coarse-mesh A-DBPs.

    Conclusions:

    • The proposed A-DBP with ABO offers a powerful and efficient solution for optical distortion compensation.
    • The method achieves superior performance and reduced complexity, even with fewer virtual spans.
    • This approach enhances the robustness and applicability of digital back propagation in optical networks.