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A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
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    This study models noise in low-cost coherent systems using amplified spontaneous emission (ASE) sources. The optimized system improves information rates by 6.67% compared to 64-QAM, reducing the need for ASE bandwidth.

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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • Investigates inherent intensity fluctuations in low-cost, low-complexity self-homodyne coherent systems.
    • Utilizes an amplified spontaneous emission (ASE) source, common in cost-effective optical systems.

    Purpose of the Study:

    • Establish a noise distribution model for the described system.
    • Design advanced mappers and demappers based on the noise model.
    • Enhance system performance and data transmission rates.

    Main Methods:

    • Developed a noise distribution model for self-homodyne coherent systems.
    • Experimentally validated the model with a 10 GBd 256-ary quadrature amplitude modulation (QAM) signal over 10 m duplex fiber.
    • Designed and implemented optimized mappers and demappers.

    Main Results:

    • The noise model shows high consistency with experimental data.
    • The optimized system alleviates the requirement for ASE bandwidth.
    • Demonstrated a 6.67% increase in information rate compared to 64-QAM.

    Conclusions:

    • The developed noise model accurately represents system behavior.
    • Advanced mappers and demappers improve system efficiency and performance.
    • The optimized system offers a practical approach to increasing data rates in coherent optical communications.