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Related Concept Videos

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

122
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
122

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Nonlinearity aware bisection-based sphere shaping for optical digital subcarrier multiplexing systems.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Fiber optic transmission systems face challenges from signal degradation due to fiber nonlinearity.
    • Existing sphere shaping techniques like enumerative sphere shaping (ESS) have limitations in mitigating these nonlinear effects.

    Purpose of the Study:

    • To propose a novel nonlinearity-tolerant sphere shaping method based on a parallel bisection structure.
    • To enhance the performance of optical communication systems by reducing energy variation and mitigating fiber nonlinearity.

    Main Methods:

    • Developed nonlinearity-tolerant bisection-based sphere shaping (BS-SS-NLI).
    • Simulated performance using probabilistically shaped, dual-polarization 64-ary quadrature amplitude modulation (DP-64QAM) over 2500 km of standard single-mode fiber (SSMF).
    • Employed digital subcarrier multiplexing (SCM) and compared results with kurtosis-limited ESS (K-ESS) and list-encoding constant composition distribution matching (L-CCDM).

    Main Results:

    • BS-SS-NLI demonstrated reduced energy variation, effectively mitigating fiber nonlinearity.
    • Achieved a 0.25 dB signal-to-noise ratio (SNR) gain over ESS and a 0.39 dB gain over L-CCDM.
    • Improved achievable information rate (AIR) by approximately 0.1 bits/4D-symbol compared to ESS.

    Conclusions:

    • The proposed BS-SS-NLI is an effective method for nonlinearity mitigation in long-haul optical transmissions.
    • BS-SS-NLI offers superior performance in terms of SNR gain and AIR compared to existing methods.
    • This technique holds promise for enhancing the capacity and reach of future optical networks.